diff --git a/app/controllers/api/v1/media_controller.rb b/app/controllers/api/v1/media_controller.rb
index a2a919a3e..72094790f 100644
--- a/app/controllers/api/v1/media_controller.rb
+++ b/app/controllers/api/v1/media_controller.rb
@@ -20,7 +20,7 @@ class Api::V1::MediaController < Api::BaseController
   end
 
   def update
-    @media_attachment.update!(media_attachment_params)
+    @media_attachment.update!(updateable_media_attachment_params)
     render json: @media_attachment, serializer: REST::MediaAttachmentSerializer, status: status_code_for_media_attachment
   end
 
@@ -42,6 +42,10 @@ class Api::V1::MediaController < Api::BaseController
     params.permit(:file, :thumbnail, :description, :focus)
   end
 
+  def updateable_media_attachment_params
+    params.permit(:thumbnail, :description, :focus)
+  end
+
   def file_type_error
     { error: 'File type of uploaded media could not be verified' }
   end
diff --git a/app/controllers/api/v1/statuses_controller.rb b/app/controllers/api/v1/statuses_controller.rb
index 98b1776ea..2d82a7a99 100644
--- a/app/controllers/api/v1/statuses_controller.rb
+++ b/app/controllers/api/v1/statuses_controller.rb
@@ -3,8 +3,8 @@
 class Api::V1::StatusesController < Api::BaseController
   include Authorization
 
-  before_action -> { authorize_if_got_token! :read, :'read:statuses' }, except: [:create, :destroy]
-  before_action -> { doorkeeper_authorize! :write, :'write:statuses' }, only:   [:create, :destroy]
+  before_action -> { authorize_if_got_token! :read, :'read:statuses' }, except: [:create, :update, :destroy]
+  before_action -> { doorkeeper_authorize! :write, :'write:statuses' }, only:   [:create, :update, :destroy]
   before_action :require_user!, except:  [:show, :context]
   before_action :set_status, only:       [:show, :context]
   before_action :set_thread, only:       [:create]
@@ -35,24 +35,44 @@ class Api::V1::StatusesController < Api::BaseController
   end
 
   def create
-    @status = PostStatusService.new.call(current_user.account,
-                                         text: status_params[:status],
-                                         thread: @thread,
-                                         media_ids: status_params[:media_ids],
-                                         sensitive: status_params[:sensitive],
-                                         spoiler_text: status_params[:spoiler_text],
-                                         visibility: status_params[:visibility],
-                                         scheduled_at: status_params[:scheduled_at],
-                                         application: doorkeeper_token.application,
-                                         poll: status_params[:poll],
-                                         idempotency: request.headers['Idempotency-Key'],
-                                         with_rate_limit: true)
+    @status = PostStatusService.new.call(
+      current_user.account,
+      text: status_params[:status],
+      thread: @thread,
+      media_ids: status_params[:media_ids],
+      sensitive: status_params[:sensitive],
+      spoiler_text: status_params[:spoiler_text],
+      visibility: status_params[:visibility],
+      language: status_params[:language],
+      scheduled_at: status_params[:scheduled_at],
+      application: doorkeeper_token.application,
+      poll: status_params[:poll],
+      idempotency: request.headers['Idempotency-Key'],
+      with_rate_limit: true
+    )
 
     render json: @status, serializer: @status.is_a?(ScheduledStatus) ? REST::ScheduledStatusSerializer : REST::StatusSerializer
   end
 
+  def update
+    @status = Status.where(account: current_account).find(params[:id])
+    authorize @status, :update?
+
+    UpdateStatusService.new.call(
+      @status,
+      current_account.id,
+      text: status_params[:status],
+      media_ids: status_params[:media_ids],
+      sensitive: status_params[:sensitive],
+      spoiler_text: status_params[:spoiler_text],
+      poll: status_params[:poll]
+    )
+
+    render json: @status, serializer: REST::StatusSerializer
+  end
+
   def destroy
-    @status = Status.where(account_id: current_user.account).find(params[:id])
+    @status = Status.where(account: current_account).find(params[:id])
     authorize @status, :destroy?
 
     @status.discard
@@ -84,6 +104,7 @@ class Api::V1::StatusesController < Api::BaseController
       :sensitive,
       :spoiler_text,
       :visibility,
+      :language,
       :scheduled_at,
       media_ids: [],
       poll: [
diff --git a/app/javascript/mastodon/actions/compose.js b/app/javascript/mastodon/actions/compose.js
index 94a4df418..b0a217550 100644
--- a/app/javascript/mastodon/actions/compose.js
+++ b/app/javascript/mastodon/actions/compose.js
@@ -70,6 +70,8 @@ export const INIT_MEDIA_EDIT_MODAL = 'INIT_MEDIA_EDIT_MODAL';
 export const COMPOSE_CHANGE_MEDIA_DESCRIPTION = 'COMPOSE_CHANGE_MEDIA_DESCRIPTION';
 export const COMPOSE_CHANGE_MEDIA_FOCUS       = 'COMPOSE_CHANGE_MEDIA_FOCUS';
 
+export const COMPOSE_SET_STATUS = 'COMPOSE_SET_STATUS';
+
 const messages = defineMessages({
   uploadErrorLimit: { id: 'upload_error.limit', defaultMessage: 'File upload limit exceeded.' },
   uploadErrorPoll:  { id: 'upload_error.poll', defaultMessage: 'File upload not allowed with polls.' },
@@ -83,6 +85,15 @@ export const ensureComposeIsVisible = (getState, routerHistory) => {
   }
 };
 
+export function setComposeToStatus(status, text, spoiler_text) {
+  return{
+    type: COMPOSE_SET_STATUS,
+    status,
+    text,
+    spoiler_text,
+  };
+};
+
 export function changeCompose(text) {
   return {
     type: COMPOSE_CHANGE,
@@ -137,8 +148,9 @@ export function directCompose(account, routerHistory) {
 
 export function submitCompose(routerHistory) {
   return function (dispatch, getState) {
-    const status = getState().getIn(['compose', 'text'], '');
-    const media  = getState().getIn(['compose', 'media_attachments']);
+    const status   = getState().getIn(['compose', 'text'], '');
+    const media    = getState().getIn(['compose', 'media_attachments']);
+    const statusId = getState().getIn(['compose', 'id'], null);
 
     if ((!status || !status.length) && media.size === 0) {
       return;
@@ -146,15 +158,18 @@ export function submitCompose(routerHistory) {
 
     dispatch(submitComposeRequest());
 
-    api(getState).post('/api/v1/statuses', {
-      status,
-      in_reply_to_id: getState().getIn(['compose', 'in_reply_to'], null),
-      media_ids: media.map(item => item.get('id')),
-      sensitive: getState().getIn(['compose', 'sensitive']),
-      spoiler_text: getState().getIn(['compose', 'spoiler']) ? getState().getIn(['compose', 'spoiler_text'], '') : '',
-      visibility: getState().getIn(['compose', 'privacy']),
-      poll: getState().getIn(['compose', 'poll'], null),
-    }, {
+    api(getState).request({
+      url: statusId === null ? '/api/v1/statuses' : `/api/v1/statuses/${statusId}`,
+      method: statusId === null ? 'post' : 'put',
+      data: {
+        status,
+        in_reply_to_id: getState().getIn(['compose', 'in_reply_to'], null),
+        media_ids: media.map(item => item.get('id')),
+        sensitive: getState().getIn(['compose', 'sensitive']),
+        spoiler_text: getState().getIn(['compose', 'spoiler']) ? getState().getIn(['compose', 'spoiler_text'], '') : '',
+        visibility: getState().getIn(['compose', 'privacy']),
+        poll: getState().getIn(['compose', 'poll'], null),
+      },
       headers: {
         'Idempotency-Key': getState().getIn(['compose', 'idempotencyKey']),
       },
@@ -176,11 +191,11 @@ export function submitCompose(routerHistory) {
         }
       };
 
-      if (response.data.visibility !== 'direct') {
+      if (statusId === null && response.data.visibility !== 'direct') {
         insertIfOnline('home');
       }
 
-      if (response.data.in_reply_to_id === null && response.data.visibility === 'public') {
+      if (statusId === null && response.data.in_reply_to_id === null && response.data.visibility === 'public') {
         insertIfOnline('community');
         insertIfOnline('public');
         insertIfOnline(`account:${response.data.account.id}`);
diff --git a/app/javascript/mastodon/actions/statuses.js b/app/javascript/mastodon/actions/statuses.js
index 20d71362e..adc24eabf 100644
--- a/app/javascript/mastodon/actions/statuses.js
+++ b/app/javascript/mastodon/actions/statuses.js
@@ -2,7 +2,7 @@ import api from '../api';
 
 import { deleteFromTimelines } from './timelines';
 import { importFetchedStatus, importFetchedStatuses, importFetchedAccount } from './importer';
-import { ensureComposeIsVisible } from './compose';
+import { ensureComposeIsVisible, setComposeToStatus } from './compose';
 
 export const STATUS_FETCH_REQUEST = 'STATUS_FETCH_REQUEST';
 export const STATUS_FETCH_SUCCESS = 'STATUS_FETCH_SUCCESS';
@@ -30,6 +30,10 @@ export const STATUS_COLLAPSE = 'STATUS_COLLAPSE';
 
 export const REDRAFT = 'REDRAFT';
 
+export const STATUS_FETCH_SOURCE_REQUEST = 'STATUS_FETCH_SOURCE_REQUEST';
+export const STATUS_FETCH_SOURCE_SUCCESS = 'STATUS_FETCH_SOURCE_SUCCESS';
+export const STATUS_FETCH_SOURCE_FAIL    = 'STATUS_FETCH_SOURCE_FAIL';
+
 export function fetchStatusRequest(id, skipLoading) {
   return {
     type: STATUS_FETCH_REQUEST,
@@ -84,6 +88,37 @@ export function redraft(status, raw_text) {
   };
 };
 
+export const editStatus = (id, routerHistory) => (dispatch, getState) => {
+  let status = getState().getIn(['statuses', id]);
+
+  if (status.get('poll')) {
+    status = status.set('poll', getState().getIn(['polls', status.get('poll')]));
+  }
+
+  dispatch(fetchStatusSourceRequest());
+
+  api(getState).get(`/api/v1/statuses/${id}/source`).then(response => {
+    dispatch(fetchStatusSourceSuccess());
+    ensureComposeIsVisible(getState, routerHistory);
+    dispatch(setComposeToStatus(status, response.data.text, response.data.spoiler_text));
+  }).catch(error => {
+    dispatch(fetchStatusSourceFail(error));
+  });
+};
+
+export const fetchStatusSourceRequest = () => ({
+  type: STATUS_FETCH_SOURCE_REQUEST,
+});
+
+export const fetchStatusSourceSuccess = () => ({
+  type: STATUS_FETCH_SOURCE_SUCCESS,
+});
+
+export const fetchStatusSourceFail = error => ({
+  type: STATUS_FETCH_SOURCE_FAIL,
+  error,
+});
+
 export function deleteStatus(id, routerHistory, withRedraft = false) {
   return (dispatch, getState) => {
     let status = getState().getIn(['statuses', id]);
diff --git a/app/javascript/mastodon/components/status_action_bar.js b/app/javascript/mastodon/components/status_action_bar.js
index 4e19cc0e4..7bd63a49d 100644
--- a/app/javascript/mastodon/components/status_action_bar.js
+++ b/app/javascript/mastodon/components/status_action_bar.js
@@ -12,6 +12,7 @@ import classNames from 'classnames';
 const messages = defineMessages({
   delete: { id: 'status.delete', defaultMessage: 'Delete' },
   redraft: { id: 'status.redraft', defaultMessage: 'Delete & re-draft' },
+  edit: { id: 'status.edit', defaultMessage: 'Edit' },
   direct: { id: 'status.direct', defaultMessage: 'Direct message @{name}' },
   mention: { id: 'status.mention', defaultMessage: 'Mention @{name}' },
   mute: { id: 'account.mute', defaultMessage: 'Mute @{name}' },
@@ -137,6 +138,10 @@ class StatusActionBar extends ImmutablePureComponent {
     this.props.onDelete(this.props.status, this.context.router.history, true);
   }
 
+  handleEditClick = () => {
+    this.props.onEdit(this.props.status, this.context.router.history);
+  }
+
   handlePinClick = () => {
     this.props.onPin(this.props.status);
   }
@@ -255,6 +260,7 @@ class StatusActionBar extends ImmutablePureComponent {
     }
 
     if (writtenByMe) {
+      menu.push({ text: intl.formatMessage(messages.edit), action: this.handleEditClick });
       menu.push({ text: intl.formatMessage(messages.delete), action: this.handleDeleteClick });
       menu.push({ text: intl.formatMessage(messages.redraft), action: this.handleRedraftClick });
     } else {
diff --git a/app/javascript/mastodon/containers/status_container.js b/app/javascript/mastodon/containers/status_container.js
index 9abdec138..ef0aca13a 100644
--- a/app/javascript/mastodon/containers/status_container.js
+++ b/app/javascript/mastodon/containers/status_container.js
@@ -24,6 +24,7 @@ import {
   hideStatus,
   revealStatus,
   toggleStatusCollapse,
+  editStatus,
 } from '../actions/statuses';
 import {
   unmuteAccount,
@@ -142,6 +143,10 @@ const mapDispatchToProps = (dispatch, { intl }) => ({
     }
   },
 
+  onEdit (status, history) {
+    dispatch(editStatus(status.get('id'), history));
+  },
+
   onDirect (account, router) {
     dispatch(directCompose(account, router));
   },
diff --git a/app/javascript/mastodon/features/compose/components/compose_form.js b/app/javascript/mastodon/features/compose/components/compose_form.js
index d224222ac..f2cfaba4e 100644
--- a/app/javascript/mastodon/features/compose/components/compose_form.js
+++ b/app/javascript/mastodon/features/compose/components/compose_form.js
@@ -28,6 +28,7 @@ const messages = defineMessages({
   spoiler_placeholder: { id: 'compose_form.spoiler_placeholder', defaultMessage: 'Write your warning here' },
   publish: { id: 'compose_form.publish', defaultMessage: 'Toot' },
   publishLoud: { id: 'compose_form.publish_loud', defaultMessage: '{publish}!' },
+  saveChanges: { id: 'compose_form.save_changes', defaultMessage: 'Save changes' },
 });
 
 export default @injectIntl
@@ -49,6 +50,7 @@ class ComposeForm extends ImmutablePureComponent {
     preselectDate: PropTypes.instanceOf(Date),
     isSubmitting: PropTypes.bool,
     isChangingUpload: PropTypes.bool,
+    isEditing: PropTypes.bool,
     isUploading: PropTypes.bool,
     onChange: PropTypes.func.isRequired,
     onSubmit: PropTypes.func.isRequired,
@@ -199,7 +201,9 @@ class ComposeForm extends ImmutablePureComponent {
     const disabled = this.props.isSubmitting;
     let publishText = '';
 
-    if (this.props.privacy === 'private' || this.props.privacy === 'direct') {
+    if (this.props.isEditing) {
+      publishText = intl.formatMessage(messages.saveChanges);
+    } else if (this.props.privacy === 'private' || this.props.privacy === 'direct') {
       publishText = <span className='compose-form__publish-private'><Icon id='lock' /> {intl.formatMessage(messages.publish)}</span>;
     } else {
       publishText = this.props.privacy !== 'unlisted' ? intl.formatMessage(messages.publishLoud, { publish: intl.formatMessage(messages.publish) }) : intl.formatMessage(messages.publish);
diff --git a/app/javascript/mastodon/features/compose/containers/compose_form_container.js b/app/javascript/mastodon/features/compose/containers/compose_form_container.js
index c44850294..1be7633cc 100644
--- a/app/javascript/mastodon/features/compose/containers/compose_form_container.js
+++ b/app/javascript/mastodon/features/compose/containers/compose_form_container.js
@@ -21,6 +21,7 @@ const mapStateToProps = state => ({
   caretPosition: state.getIn(['compose', 'caretPosition']),
   preselectDate: state.getIn(['compose', 'preselectDate']),
   isSubmitting: state.getIn(['compose', 'is_submitting']),
+  isEditing: state.getIn(['compose', 'id']) !== null,
   isChangingUpload: state.getIn(['compose', 'is_changing_upload']),
   isUploading: state.getIn(['compose', 'is_uploading']),
   showSearch: state.getIn(['search', 'submitted']) && !state.getIn(['search', 'hidden']),
diff --git a/app/javascript/mastodon/features/compose/containers/reply_indicator_container.js b/app/javascript/mastodon/features/compose/containers/reply_indicator_container.js
index 5eb1eb72a..a1302b2d4 100644
--- a/app/javascript/mastodon/features/compose/containers/reply_indicator_container.js
+++ b/app/javascript/mastodon/features/compose/containers/reply_indicator_container.js
@@ -6,9 +6,20 @@ import ReplyIndicator from '../components/reply_indicator';
 const makeMapStateToProps = () => {
   const getStatus = makeGetStatus();
 
-  const mapStateToProps = state => ({
-    status: getStatus(state, { id: state.getIn(['compose', 'in_reply_to']) }),
-  });
+  const mapStateToProps = state => {
+    let statusId = state.getIn(['compose', 'id'], null);
+    let editing  = true;
+
+    if (statusId === null) {
+      statusId = state.getIn(['compose', 'in_reply_to']);
+      editing  = false;
+    }
+
+    return {
+      status: getStatus(state, { id: statusId }),
+      editing,
+    };
+  };
 
   return mapStateToProps;
 };
diff --git a/app/javascript/mastodon/features/status/components/action_bar.js b/app/javascript/mastodon/features/status/components/action_bar.js
index a15a4d567..ed02a493c 100644
--- a/app/javascript/mastodon/features/status/components/action_bar.js
+++ b/app/javascript/mastodon/features/status/components/action_bar.js
@@ -11,6 +11,7 @@ import classNames from 'classnames';
 const messages = defineMessages({
   delete: { id: 'status.delete', defaultMessage: 'Delete' },
   redraft: { id: 'status.redraft', defaultMessage: 'Delete & re-draft' },
+  edit: { id: 'status.edit', defaultMessage: 'Edit' },
   direct: { id: 'status.direct', defaultMessage: 'Direct message @{name}' },
   mention: { id: 'status.mention', defaultMessage: 'Mention @{name}' },
   reply: { id: 'status.reply', defaultMessage: 'Reply' },
@@ -59,6 +60,7 @@ class ActionBar extends React.PureComponent {
     onFavourite: PropTypes.func.isRequired,
     onBookmark: PropTypes.func.isRequired,
     onDelete: PropTypes.func.isRequired,
+    onEdit: PropTypes.func.isRequired,
     onDirect: PropTypes.func.isRequired,
     onMention: PropTypes.func.isRequired,
     onMute: PropTypes.func,
@@ -98,6 +100,10 @@ class ActionBar extends React.PureComponent {
     this.props.onDelete(this.props.status, this.context.router.history, true);
   }
 
+  handleEditClick = () => {
+    this.props.onEdit(this.props.status, this.context.router.history);
+  }
+
   handleDirectClick = () => {
     this.props.onDirect(this.props.status.get('account'), this.context.router.history);
   }
@@ -209,6 +215,7 @@ class ActionBar extends React.PureComponent {
 
       menu.push({ text: intl.formatMessage(mutingConversation ? messages.unmuteConversation : messages.muteConversation), action: this.handleConversationMuteClick });
       menu.push(null);
+      menu.push({ text: intl.formatMessage(messages.edit), action: this.handleEditClick });
       menu.push({ text: intl.formatMessage(messages.delete), action: this.handleDeleteClick });
       menu.push({ text: intl.formatMessage(messages.redraft), action: this.handleRedraftClick });
     } else {
diff --git a/app/javascript/mastodon/features/status/index.js b/app/javascript/mastodon/features/status/index.js
index f342a3641..4d7f24834 100644
--- a/app/javascript/mastodon/features/status/index.js
+++ b/app/javascript/mastodon/features/status/index.js
@@ -29,6 +29,7 @@ import {
   muteStatus,
   unmuteStatus,
   deleteStatus,
+  editStatus,
   hideStatus,
   revealStatus,
 } from '../../actions/statuses';
@@ -273,6 +274,10 @@ class Status extends ImmutablePureComponent {
     }
   }
 
+  handleEditClick = (status, history) => {
+    this.props.dispatch(editStatus(status.get('id'), history));
+  }
+
   handleDirectClick = (account, router) => {
     this.props.dispatch(directCompose(account, router));
   }
@@ -567,6 +572,7 @@ class Status extends ImmutablePureComponent {
                   onReblog={this.handleReblogClick}
                   onBookmark={this.handleBookmarkClick}
                   onDelete={this.handleDeleteClick}
+                  onEdit={this.handleEditClick}
                   onDirect={this.handleDirectClick}
                   onMention={this.handleMentionClick}
                   onMute={this.handleMuteClick}
diff --git a/app/javascript/mastodon/reducers/compose.js b/app/javascript/mastodon/reducers/compose.js
index 06a908e9d..ea882a71f 100644
--- a/app/javascript/mastodon/reducers/compose.js
+++ b/app/javascript/mastodon/reducers/compose.js
@@ -43,6 +43,7 @@ import {
   INIT_MEDIA_EDIT_MODAL,
   COMPOSE_CHANGE_MEDIA_DESCRIPTION,
   COMPOSE_CHANGE_MEDIA_FOCUS,
+  COMPOSE_SET_STATUS,
 } from '../actions/compose';
 import { TIMELINE_DELETE } from '../actions/timelines';
 import { STORE_HYDRATE } from '../actions/store';
@@ -58,6 +59,7 @@ const initialState = ImmutableMap({
   spoiler: false,
   spoiler_text: '',
   privacy: null,
+  id: null,
   text: '',
   focusDate: null,
   caretPosition: null,
@@ -107,6 +109,7 @@ function statusToTextMentions(state, status) {
 
 function clearAll(state) {
   return state.withMutations(map => {
+    map.set('id', null);
     map.set('text', '');
     map.set('spoiler', false);
     map.set('spoiler_text', '');
@@ -313,6 +316,7 @@ export default function compose(state = initialState, action) {
     return state.set('is_composing', action.value);
   case COMPOSE_REPLY:
     return state.withMutations(map => {
+      map.set('id', null);
       map.set('in_reply_to', action.status.get('id'));
       map.set('text', statusToTextMentions(state, action.status));
       map.set('privacy', privacyPreference(action.status.get('visibility'), state.get('default_privacy')));
@@ -329,21 +333,12 @@ export default function compose(state = initialState, action) {
         map.set('spoiler_text', '');
       }
     });
-  case COMPOSE_REPLY_CANCEL:
-  case COMPOSE_RESET:
-    return state.withMutations(map => {
-      map.set('in_reply_to', null);
-      map.set('text', '');
-      map.set('spoiler', false);
-      map.set('spoiler_text', '');
-      map.set('privacy', state.get('default_privacy'));
-      map.set('poll', null);
-      map.set('idempotencyKey', uuid());
-    });
   case COMPOSE_SUBMIT_REQUEST:
     return state.set('is_submitting', true);
   case COMPOSE_UPLOAD_CHANGE_REQUEST:
     return state.set('is_changing_upload', true);
+  case COMPOSE_REPLY_CANCEL:
+  case COMPOSE_RESET:
   case COMPOSE_SUBMIT_SUCCESS:
     return clearAll(state);
   case COMPOSE_SUBMIT_FAIL:
@@ -454,6 +449,34 @@ export default function compose(state = initialState, action) {
         map.set('spoiler_text', '');
       }
 
+      if (action.status.get('poll')) {
+        map.set('poll', ImmutableMap({
+          options: action.status.getIn(['poll', 'options']).map(x => x.get('title')),
+          multiple: action.status.getIn(['poll', 'multiple']),
+          expires_in: expiresInFromExpiresAt(action.status.getIn(['poll', 'expires_at'])),
+        }));
+      }
+    });
+  case COMPOSE_SET_STATUS:
+    return state.withMutations(map => {
+      map.set('id', action.status.get('id'));
+      map.set('text', action.text);
+      map.set('in_reply_to', action.status.get('in_reply_to_id'));
+      map.set('privacy', action.status.get('visibility'));
+      map.set('media_attachments', action.status.get('media_attachments'));
+      map.set('focusDate', new Date());
+      map.set('caretPosition', null);
+      map.set('idempotencyKey', uuid());
+      map.set('sensitive', action.status.get('sensitive'));
+
+      if (action.spoiler_text.length > 0) {
+        map.set('spoiler', true);
+        map.set('spoiler_text', action.spoiler_text);
+      } else {
+        map.set('spoiler', false);
+        map.set('spoiler_text', '');
+      }
+
       if (action.status.get('poll')) {
         map.set('poll', ImmutableMap({
           options: action.status.getIn(['poll', 'options']).map(x => x.get('title')),
diff --git a/app/models/media_attachment.rb b/app/models/media_attachment.rb
index 1741d20e9..0a9d05f1d 100644
--- a/app/models/media_attachment.rb
+++ b/app/models/media_attachment.rb
@@ -208,6 +208,10 @@ class MediaAttachment < ApplicationRecord
     file.blank? && remote_url.present?
   end
 
+  def significantly_changed?
+    description_previously_changed? || thumbnail_updated_at_previously_changed? || file_meta_previously_changed?
+  end
+
   def larger_media_format?
     video? || gifv? || audio?
   end
diff --git a/app/models/status.rb b/app/models/status.rb
index 47671c0f5..4fabf24ef 100644
--- a/app/models/status.rb
+++ b/app/models/status.rb
@@ -209,6 +209,16 @@ class Status < ApplicationRecord
     public_visibility? || unlisted_visibility?
   end
 
+  def snapshot!(media_attachments_changed: false, account_id: nil, at_time: nil)
+    edits.create!(
+      text: text,
+      spoiler_text: spoiler_text,
+      media_attachments_changed: media_attachments_changed,
+      account_id: account_id || self.account_id,
+      created_at: at_time || edited_at
+    )
+  end
+
   def edited?
     edited_at.present?
   end
diff --git a/app/policies/status_policy.rb b/app/policies/status_policy.rb
index bcf9c3395..6e9b840db 100644
--- a/app/policies/status_policy.rb
+++ b/app/policies/status_policy.rb
@@ -38,7 +38,7 @@ class StatusPolicy < ApplicationPolicy
   alias unreblog? destroy?
 
   def update?
-    staff?
+    staff? || owned?
   end
 
   private
diff --git a/app/services/activitypub/process_status_update_service.rb b/app/services/activitypub/process_status_update_service.rb
index b1cea1cdf..5e38852fc 100644
--- a/app/services/activitypub/process_status_update_service.rb
+++ b/app/services/activitypub/process_status_update_service.rb
@@ -217,24 +217,18 @@ class ActivityPub::ProcessStatusUpdateService < BaseService
 
     return if @status.edits.any?
 
-    @status.edits.create(
-      text: @status.text,
-      spoiler_text: @status.spoiler_text,
+    @status.snapshot!(
       media_attachments_changed: false,
-      account_id: @account.id,
-      created_at: @status.created_at
+      at_time: @status.created_at
     )
   end
 
   def create_edit!
     return unless significant_changes?
 
-    @status_edit = @status.edits.create(
-      text: @status.text,
-      spoiler_text: @status.spoiler_text,
+    @status.snapshot!(
       media_attachments_changed: @media_attachments_changed || @poll_changed,
-      account_id: @account.id,
-      created_at: @status.edited_at
+      account_id: @account.id
     )
   end
 
diff --git a/app/services/process_hashtags_service.rb b/app/services/process_hashtags_service.rb
index 47277c56c..43d7bcca6 100644
--- a/app/services/process_hashtags_service.rb
+++ b/app/services/process_hashtags_service.rb
@@ -1,20 +1,40 @@
 # frozen_string_literal: true
 
 class ProcessHashtagsService < BaseService
-  def call(status, tags = [])
-    tags    = Extractor.extract_hashtags(status.text) if status.local?
-    records = []
+  def call(status, raw_tags = [])
+    @status        = status
+    @account       = status.account
+    @raw_tags      = status.local? ? Extractor.extract_hashtags(status.text) : raw_tags
+    @previous_tags = status.tags.to_a
+    @current_tags  = []
 
-    Tag.find_or_create_by_names(tags) do |tag|
-      status.tags << tag
-      records << tag
-      tag.update(last_status_at: status.created_at) if tag.last_status_at.nil? || (tag.last_status_at < status.created_at && tag.last_status_at < 12.hours.ago)
+    assign_tags!
+    update_featured_tags!
+  end
+
+  private
+
+  def assign_tags!
+    @status.tags = @current_tags = Tag.find_or_create_by_names(@raw_tags)
+  end
+
+  def update_featured_tags!
+    return unless @status.distributable?
+
+    added_tags = @current_tags - @previous_tags
+
+    unless added_tags.empty?
+      @account.featured_tags.where(tag_id: added_tags.map(&:id)).each do |featured_tag|
+        featured_tag.increment(@status.created_at)
+      end
     end
 
-    return unless status.distributable?
+    removed_tags = @previous_tags - @current_tags
 
-    status.account.featured_tags.where(tag_id: records.map(&:id)).each do |featured_tag|
-      featured_tag.increment(status.created_at)
+    unless removed_tags.empty?
+      @account.featured_tags.where(tag_id: removed_tags.map(&:id)).each do |featured_tag|
+        featured_tag.decrement(@status.id)
+      end
     end
   end
 end
diff --git a/app/services/update_status_service.rb b/app/services/update_status_service.rb
new file mode 100644
index 000000000..69dc18e87
--- /dev/null
+++ b/app/services/update_status_service.rb
@@ -0,0 +1,156 @@
+# frozen_string_literal: true
+
+class UpdateStatusService < BaseService
+  include Redisable
+
+  # @param [Status] status
+  # @param [Integer] account_id
+  # @param [Hash] options
+  # @option options [Array<Integer>] :media_ids
+  # @option options [Hash] :poll
+  # @option options [String] :text
+  # @option options [String] :spoiler_text
+  # @option options [Boolean] :sensitive
+  # @option options [String] :language
+  def call(status, account_id, options = {})
+    @status                    = status
+    @options                   = options
+    @account_id                = account_id
+    @media_attachments_changed = false
+    @poll_changed              = false
+
+    Status.transaction do
+      create_previous_edit!
+      update_media_attachments!
+      update_poll!
+      update_immediate_attributes!
+      create_edit!
+    end
+
+    queue_poll_notifications!
+    reset_preview_card!
+    update_metadata!
+    broadcast_updates!
+
+    @status
+  end
+
+  private
+
+  def update_media_attachments!
+    previous_media_attachments = @status.media_attachments.to_a
+    next_media_attachments     = validate_media!
+    removed_media_attachments  = previous_media_attachments - next_media_attachments
+    added_media_attachments    = next_media_attachments - previous_media_attachments
+
+    MediaAttachment.where(id: removed_media_attachments.map(&:id)).update_all(status_id: nil)
+    MediaAttachment.where(id: added_media_attachments.map(&:id)).update_all(status_id: @status.id)
+
+    @status.media_attachments.reload
+    @media_attachments_changed = true if removed_media_attachments.any? || added_media_attachments.any?
+  end
+
+  def validate_media!
+    return [] if @options[:media_ids].blank? || !@options[:media_ids].is_a?(Enumerable)
+
+    raise Mastodon::ValidationError, I18n.t('media_attachments.validations.too_many') if @options[:media_ids].size > 4 || @options[:poll].present?
+
+    media_attachments = @status.account.media_attachments.where(status_id: [nil, @status.id]).where(scheduled_status_id: nil).where(id: @options[:media_ids].take(4).map(&:to_i)).to_a
+
+    raise Mastodon::ValidationError, I18n.t('media_attachments.validations.images_and_video') if media_attachments.size > 1 && media_attachments.find(&:audio_or_video?)
+    raise Mastodon::ValidationError, I18n.t('media_attachments.validations.not_ready') if media_attachments.any?(&:not_processed?)
+
+    media_attachments
+  end
+
+  def update_poll!
+    previous_poll        = @status.preloadable_poll
+    @previous_expires_at = previous_poll&.expires_at
+
+    if @options[:poll].present?
+      poll = previous_poll || @status.account.polls.new(status: @status, votes_count: 0)
+
+      # If for some reasons the options were changed, it invalidates all previous
+      # votes, so we need to remove them
+      if @options[:poll][:options] != poll.options || ActiveModel::Type::Boolean.new.cast(@options[:poll][:multiple]) != poll.multiple
+        @poll_changed = true
+        poll.votes.delete_all unless poll.new_record?
+      end
+
+      poll.options     = @options[:poll][:options]
+      poll.hide_totals = @options[:poll][:hide_totals] || false
+      poll.multiple    = @options[:poll][:multiple] || false
+      poll.expires_in  = @options[:poll][:expires_in]
+      poll.save!
+
+      @status.poll_id = poll.id
+    elsif previous_poll.present?
+      previous_poll.destroy
+      @poll_changed = true
+      @status.poll_id = nil
+    end
+  end
+
+  def update_immediate_attributes!
+    @status.text         = @options[:text].presence || @options.delete(:spoiler_text) || ''
+    @status.spoiler_text = @options[:spoiler_text] || ''
+    @status.sensitive    = @options[:sensitive] || @options[:spoiler_text].present?
+    @status.language     = language_from_option || @status.language
+    @status.edited_at    = Time.now.utc
+
+    @status.save!
+  end
+
+  def language_from_option
+    ISO_639.find(@options[:language])&.alpha2
+  end
+
+  def reset_preview_card!
+    return unless @status.text_previously_changed?
+
+    @status.preview_cards.clear
+    LinkCrawlWorker.perform_async(@status.id)
+  end
+
+  def update_metadata!
+    ProcessHashtagsService.new.call(@status)
+    ProcessMentionsService.new.call(@status)
+  end
+
+  def broadcast_updates!
+    DistributionWorker.perform_async(@status.id, { 'update' => true })
+    ActivityPub::StatusUpdateDistributionWorker.perform_async(@status.id)
+  end
+
+  def queue_poll_notifications!
+    poll = @status.preloadable_poll
+
+    # If the poll had no expiration date set but now has, or now has a sooner
+    # expiration date, and people have voted, schedule a notification
+
+    return unless poll.present? && poll.expires_at.present? && poll.votes.exists?
+
+    PollExpirationNotifyWorker.remove_from_scheduled(poll.id) if @previous_expires_at.present? && @previous_expires_at > poll.expires_at
+    PollExpirationNotifyWorker.perform_at(poll.expires_at + 5.minutes, poll.id)
+  end
+
+  def create_previous_edit!
+    # We only need to create a previous edit when no previous edits exist, e.g.
+    # when the status has never been edited. For other cases, we always create
+    # an edit, so the step can be skipped
+
+    return if @status.edits.any?
+
+    @status.snapshot!(
+      media_attachments_changed: false,
+      at_time: @status.created_at
+    )
+  end
+
+  def create_edit!
+    @status.snapshot!(
+      media_attachments_changed: @media_attachments_changed || @poll_changed,
+      account_id: @account_id
+    )
+  end
+end
diff --git a/app/workers/activitypub/status_update_distribution_worker.rb b/app/workers/activitypub/status_update_distribution_worker.rb
new file mode 100644
index 000000000..261aaa0cc
--- /dev/null
+++ b/app/workers/activitypub/status_update_distribution_worker.rb
@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+class ActivityPub::StatusUpdateDistributionWorker < ActivityPub::DistributionWorker
+  # Distribute an profile update to servers that might have a copy
+  # of the account in question
+  def perform(status_id, options = {})
+    @options = options.with_indifferent_access
+    @status  = Status.find(status_id)
+
+    distribute!
+  rescue ActiveRecord::RecordNotFound
+    true
+  end
+
+  protected
+
+  def activity
+    ActivityPub::ActivityPresenter.new(
+      id: [ActivityPub::TagManager.instance.uri_for(@status), '#updates/', @status.edited_at.to_i].join,
+      type: 'Update',
+      actor: ActivityPub::TagManager.instance.uri_for(@status.account),
+      published: @status.edited_at,
+      to: ActivityPub::TagManager.instance.to(@status),
+      cc: ActivityPub::TagManager.instance.cc(@status),
+      virtual_object: @status
+    )
+  end
+end
diff --git a/config/routes.rb b/config/routes.rb
index 121587819..670bebce2 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -332,7 +332,7 @@ Rails.application.routes.draw do
 
     # JSON / REST API
     namespace :v1 do
-      resources :statuses, only: [:create, :show, :destroy] do
+      resources :statuses, only: [:create, :show, :update, :destroy] do
         scope module: :statuses do
           resources :reblogged_by, controller: :reblogged_by_accounts, only: :index
           resources :favourited_by, controller: :favourited_by_accounts, only: :index
diff --git a/spec/controllers/api/v1/media_controller_spec.rb b/spec/controllers/api/v1/media_controller_spec.rb
index d8d732630..a1f6ddb24 100644
--- a/spec/controllers/api/v1/media_controller_spec.rb
+++ b/spec/controllers/api/v1/media_controller_spec.rb
@@ -110,21 +110,24 @@ RSpec.describe Api::V1::MediaController, type: :controller do
       end
     end
 
-    context 'when not attached to a status' do
-      let(:media) { Fabricate(:media_attachment, status: nil, account: user.account) }
+    context 'when the author \'s' do
+      let(:status) { nil }
+      let(:media)  { Fabricate(:media_attachment, status: status, account: user.account) }
+
+      before do
+        put :update, params: { id: media.id, description: 'Lorem ipsum!!!' }
+      end
 
       it 'updates the description' do
-        put :update, params: { id: media.id, description: 'Lorem ipsum!!!' }
         expect(media.reload.description).to eq 'Lorem ipsum!!!'
       end
-    end
 
-    context 'when attached to a status' do
-      let(:media) { Fabricate(:media_attachment, status: Fabricate(:status), account: user.account) }
+      context 'when already attached to a status' do
+        let(:status) { Fabricate(:status, account: user.account) }
 
-      it 'returns http not found' do
-        put :update, params: { id: media.id, description: 'Lorem ipsum!!!' }
-        expect(response).to have_http_status(:not_found)
+        it 'returns http not found' do
+          expect(response).to have_http_status(:not_found)
+        end
       end
     end
   end
diff --git a/spec/controllers/api/v1/statuses_controller_spec.rb b/spec/controllers/api/v1/statuses_controller_spec.rb
index 2679ab017..190dfad11 100644
--- a/spec/controllers/api/v1/statuses_controller_spec.rb
+++ b/spec/controllers/api/v1/statuses_controller_spec.rb
@@ -102,6 +102,23 @@ RSpec.describe Api::V1::StatusesController, type: :controller do
         expect(Status.find_by(id: status.id)).to be nil
       end
     end
+
+    describe 'PUT #update' do
+      let(:scopes) { 'write:statuses' }
+      let(:status) { Fabricate(:status, account: user.account) }
+
+      before do
+        put :update, params: { id: status.id, status: 'I am updated' }
+      end
+
+      it 'returns http success' do
+        expect(response).to have_http_status(200)
+      end
+
+      it 'updates the status' do
+        expect(status.reload.text).to eq 'I am updated'
+      end
+    end
   end
 
   context 'without an oauth token' do
diff --git a/spec/policies/status_policy_spec.rb b/spec/policies/status_policy_spec.rb
index 1cddf4abd..28b808ee2 100644
--- a/spec/policies/status_policy_spec.rb
+++ b/spec/policies/status_policy_spec.rb
@@ -125,7 +125,7 @@ RSpec.describe StatusPolicy, type: :model do
     end
   end
 
-  permissions :index?, :update? do
+  permissions :index? do
     it 'grants access if staff' do
       expect(subject).to permit(admin.account)
     end
@@ -134,4 +134,18 @@ RSpec.describe StatusPolicy, type: :model do
       expect(subject).to_not permit(alice)
     end
   end
+
+  permissions :update? do
+    it 'grants access if staff' do
+      expect(subject).to permit(admin.account, status)
+    end
+
+    it 'grants access if owner' do
+      expect(subject).to permit(status.account, status)
+    end
+
+    it 'denies access unless staff' do
+      expect(subject).to_not permit(bob, status)
+    end
+  end
 end
diff --git a/spec/services/activitypub/process_status_update_service_spec.rb b/spec/services/activitypub/process_status_update_service_spec.rb
new file mode 100644
index 000000000..6ee1dcb43
--- /dev/null
+++ b/spec/services/activitypub/process_status_update_service_spec.rb
@@ -0,0 +1,248 @@
+require 'rails_helper'
+
+RSpec.describe ActivityPub::ProcessStatusUpdateService, type: :service do
+  let!(:status) { Fabricate(:status, text: 'Hello world', account: Fabricate(:account, domain: 'example.com')) }
+
+  let(:alice) { Fabricate(:account) }
+  let(:bob) { Fabricate(:account) }
+
+  let(:mentions) { [] }
+  let(:tags) { [] }
+  let(:media_attachments) { [] }
+
+  before do
+    mentions.each { |a| Fabricate(:mention, status: status, account: a) }
+    tags.each { |t| status.tags << t }
+    media_attachments.each { |m| status.media_attachments << m }
+  end
+
+  let(:payload) do
+    {
+      '@context': 'https://www.w3.org/ns/activitystreams',
+      id: 'foo',
+      type: 'Note',
+      summary: 'Show more',
+      content: 'Hello universe',
+      updated: '2021-09-08T22:39:25Z',
+      tag: [
+        { type: 'Hashtag', name: 'hoge' },
+        { type: 'Mention', href: ActivityPub::TagManager.instance.uri_for(alice) },
+      ],
+    }
+  end
+
+  let(:json) { Oj.load(Oj.dump(payload)) }
+
+  subject { described_class.new }
+
+  describe '#call' do
+    it 'updates text' do
+      subject.call(status, json)
+      expect(status.reload.text).to eq 'Hello universe'
+    end
+
+    it 'updates content warning' do
+      subject.call(status, json)
+      expect(status.reload.spoiler_text).to eq 'Show more'
+    end
+
+    context 'originally without tags' do
+      before do
+        subject.call(status, json)
+      end
+
+      it 'updates tags' do
+        expect(status.tags.reload.map(&:name)).to eq %w(hoge)
+      end
+    end
+
+    context 'originally with tags' do
+      let(:tags) { [Fabricate(:tag, name: 'test'), Fabricate(:tag, name: 'foo')] }
+
+      let(:payload) do
+        {
+          '@context': 'https://www.w3.org/ns/activitystreams',
+          id: 'foo',
+          type: 'Note',
+          summary: 'Show more',
+          content: 'Hello universe',
+          updated: '2021-09-08T22:39:25Z',
+          tag: [
+            { type: 'Hashtag', name: 'foo' },
+          ],
+        }
+      end
+
+      before do
+        subject.call(status, json)
+      end
+
+      it 'updates tags' do
+        expect(status.tags.reload.map(&:name)).to eq %w(foo)
+      end
+    end
+
+    context 'originally without mentions' do
+      before do
+        subject.call(status, json)
+      end
+
+      it 'updates mentions' do
+        expect(status.active_mentions.reload.map(&:account_id)).to eq [alice.id]
+      end
+    end
+
+    context 'originally with mentions' do
+      let(:mentions) { [alice, bob] }
+
+      before do
+        subject.call(status, json)
+      end
+
+      it 'updates mentions' do
+        expect(status.active_mentions.reload.map(&:account_id)).to eq [alice.id]
+      end
+    end
+
+    context 'originally without media attachments' do
+      before do
+        allow(RedownloadMediaWorker).to receive(:perform_async)
+        subject.call(status, json)
+      end
+
+      let(:payload) do
+        {
+          '@context': 'https://www.w3.org/ns/activitystreams',
+          id: 'foo',
+          type: 'Note',
+          content: 'Hello universe',
+          updated: '2021-09-08T22:39:25Z',
+          attachment: [
+            { type: 'Image', mediaType: 'image/png', url: 'https://example.com/foo.png' },
+          ]
+        }
+      end
+
+      it 'updates media attachments' do
+        media_attachment = status.media_attachments.reload.first
+
+        expect(media_attachment).to_not be_nil
+        expect(media_attachment.remote_url).to eq 'https://example.com/foo.png'
+      end
+
+      it 'queues download of media attachments' do
+        expect(RedownloadMediaWorker).to have_received(:perform_async)
+      end
+
+      it 'records media change in edit' do
+        expect(status.edits.reload.last.media_attachments_changed).to be true
+      end
+    end
+
+    context 'originally with media attachments' do
+      let(:media_attachments) { [Fabricate(:media_attachment, remote_url: 'https://example.com/foo.png'), Fabricate(:media_attachment, remote_url: 'https://example.com/unused.png')] }
+
+      let(:payload) do
+        {
+          '@context': 'https://www.w3.org/ns/activitystreams',
+          id: 'foo',
+          type: 'Note',
+          content: 'Hello universe',
+          updated: '2021-09-08T22:39:25Z',
+          attachment: [
+            { type: 'Image', mediaType: 'image/png', url: 'https://example.com/foo.png', name: 'A picture' },
+          ]
+        }
+      end
+
+      before do
+        allow(RedownloadMediaWorker).to receive(:perform_async)
+        subject.call(status, json)
+      end
+
+      it 'updates the existing media attachment in-place' do
+        media_attachment = status.media_attachments.reload.first
+
+        expect(media_attachment).to_not be_nil
+        expect(media_attachment.remote_url).to eq 'https://example.com/foo.png'
+        expect(media_attachment.description).to eq 'A picture'
+      end
+
+      it 'does not queue redownload for the existing media attachment' do
+        expect(RedownloadMediaWorker).to_not have_received(:perform_async)
+      end
+
+      it 'updates media attachments' do
+        expect(status.media_attachments.reload.map(&:remote_url)).to eq %w(https://example.com/foo.png)
+      end
+
+      it 'records media change in edit' do
+        expect(status.edits.reload.last.media_attachments_changed).to be true
+      end
+    end
+
+    context 'originally with a poll' do
+      before do
+        poll = Fabricate(:poll, status: status)
+        status.update(preloadable_poll: poll)
+        subject.call(status, json)
+      end
+
+      it 'removes poll' do
+        expect(status.reload.poll).to eq nil
+      end
+
+      it 'records media change in edit' do
+        expect(status.edits.reload.last.media_attachments_changed).to be true
+      end
+    end
+
+    context 'originally without a poll' do
+      let(:payload) do
+        {
+          '@context': 'https://www.w3.org/ns/activitystreams',
+          id: 'foo',
+          type: 'Question',
+          content: 'Hello universe',
+          updated: '2021-09-08T22:39:25Z',
+          closed: true,
+          oneOf: [
+            { type: 'Note', name: 'Foo' },
+            { type: 'Note', name: 'Bar' },
+            { type: 'Note', name: 'Baz' },
+          ],
+        }
+      end
+
+      before do
+        subject.call(status, json)
+      end
+
+      it 'creates a poll' do
+        poll = status.reload.poll
+
+        expect(poll).to_not be_nil
+        expect(poll.options).to eq %w(Foo Bar Baz)
+      end
+
+      it 'records media change in edit' do
+        expect(status.edits.reload.last.media_attachments_changed).to be true
+      end
+    end
+
+    it 'creates edit history' do
+      subject.call(status, json)
+      expect(status.edits.reload.map(&:text)).to eq ['Hello world', 'Hello universe']
+    end
+
+    it 'sets edited timestamp' do
+      subject.call(status, json)
+      expect(status.reload.edited_at.to_s).to eq '2021-09-08 22:39:25 UTC'
+    end
+
+    it 'records that no media has been changed in edit' do
+      subject.call(status, json)
+      expect(status.edits.reload.last.media_attachments_changed).to be false
+    end
+  end
+end
diff --git a/spec/services/update_status_service_spec.rb b/spec/services/update_status_service_spec.rb
new file mode 100644
index 000000000..1d4b0a6be
--- /dev/null
+++ b/spec/services/update_status_service_spec.rb
@@ -0,0 +1,130 @@
+require 'rails_helper'
+
+RSpec.describe UpdateStatusService, type: :service do
+  subject { described_class.new }
+
+  context 'when text changes' do
+    let!(:status) { Fabricate(:status, text: 'Foo') }
+    let(:preview_card) { Fabricate(:preview_card) }
+
+    before do
+      status.preview_cards << preview_card
+      subject.call(status, status.account_id, text: 'Bar')
+    end
+
+    it 'updates text' do
+      expect(status.reload.text).to eq 'Bar'
+    end
+
+    it 'resets preview card' do
+      expect(status.reload.preview_card).to be_nil
+    end
+
+    it 'saves edit history' do
+      expect(status.edits.pluck(:text, :media_attachments_changed)).to eq [['Foo', false], ['Bar', false]]
+    end
+  end
+
+  context 'when content warning changes' do
+    let!(:status) { Fabricate(:status, text: 'Foo', spoiler_text: '') }
+    let(:preview_card) { Fabricate(:preview_card) }
+
+    before do
+      status.preview_cards << preview_card
+      subject.call(status, status.account_id, text: 'Foo', spoiler_text: 'Bar')
+    end
+
+    it 'updates content warning' do
+      expect(status.reload.spoiler_text).to eq 'Bar'
+    end
+
+    it 'saves edit history' do
+      expect(status.edits.pluck(:text, :spoiler_text, :media_attachments_changed)).to eq [['Foo', '', false], ['Foo', 'Bar', false]]
+    end
+  end
+
+  context 'when media attachments change' do
+    let!(:status) { Fabricate(:status, text: 'Foo') }
+    let!(:detached_media_attachment) { Fabricate(:media_attachment, account: status.account) }
+    let!(:attached_media_attachment) { Fabricate(:media_attachment, account: status.account) }
+
+    before do
+      status.media_attachments << detached_media_attachment
+      subject.call(status, status.account_id, text: 'Foo', media_ids: [attached_media_attachment.id])
+    end
+
+    it 'updates media attachments' do
+      expect(status.media_attachments.to_a).to eq [attached_media_attachment]
+    end
+
+    it 'detaches detached media attachments' do
+      expect(detached_media_attachment.reload.status_id).to be_nil
+    end
+
+    it 'attaches attached media attachments' do
+      expect(attached_media_attachment.reload.status_id).to eq status.id
+    end
+
+    it 'saves edit history' do
+      expect(status.edits.pluck(:text, :media_attachments_changed)).to eq [['Foo', false], ['Foo', true]]
+    end
+  end
+
+  context 'when poll changes' do
+    let!(:status) { Fabricate(:status, text: 'Foo') }
+    let!(:poll) { Fabricate(:poll, options: %w(Foo Bar)) }
+
+    before do
+      status.update(poll: poll)
+      subject.call(status, status.account_id, text: 'Foo', poll: { options: %w(Bar Baz), expires_in: 5.days.to_i })
+    end
+
+    it 'updates poll' do
+      expect(status.poll).to_not eq poll
+      expect(status.poll.options).to eq %w(Bar Baz)
+    end
+
+    it 'saves edit history' do
+      expect(status.edits.pluck(:text, :media_attachments_changed)).to eq [['Foo', false], ['Foo', true]]
+    end
+  end
+
+  context 'when mentions in text change' do
+    let!(:account) { Fabricate(:account) }
+    let!(:alice) { Fabricate(:account, username: 'alice') }
+    let!(:bob) { Fabricate(:account, username: 'bob') }
+    let!(:status) { PostStatusService.new.call(account, text: 'Hello @alice') }
+
+    before do
+      subject.call(status, status.account_id, text: 'Hello @bob')
+    end
+
+    it 'changes mentions' do
+      expect(status.active_mentions.pluck(:account_id)).to eq [bob.id]
+    end
+
+    it 'keeps old mentions as silent mentions' do
+      expect(status.mentions.pluck(:account_id)).to eq [alice.id, bob.id]
+    end
+  end
+
+  context 'when hashtags in text change' do
+    let!(:account) { Fabricate(:account) }
+    let!(:status) { PostStatusService.new.call(account, text: 'Hello #foo') }
+
+    before do
+      subject.call(status, status.account_id, text: 'Hello #bar')
+    end
+
+    it 'changes tags' do
+      expect(status.tags.pluck(:name)).to eq %w(bar)
+    end
+  end
+
+  it 'notifies ActivityPub about the update' do
+    status = Fabricate(:status, text: 'Foo')
+    allow(ActivityPub::DistributionWorker).to receive(:perform_async)
+    subject.call(status, status.account_id, text: 'Bar')
+    expect(ActivityPub::DistributionWorker).to have_received(:perform_async)
+  end
+end