diff --git a/src/actions/compose.ts b/src/actions/compose.ts
index b0733cda9..600cf869c 100644
--- a/src/actions/compose.ts
+++ b/src/actions/compose.ts
@@ -24,7 +24,7 @@ import { createStatus } from './statuses.ts';
 import type { EditorState } from 'lexical';
 import type { AutoSuggestion } from 'soapbox/components/autosuggest-input.tsx';
 import type { Emoji } from 'soapbox/features/emoji/index.ts';
-import type { Account, Group } from 'soapbox/schemas/index.ts';
+import type { Account, CustomEmoji, Group } from 'soapbox/schemas/index.ts';
 import type { AppDispatch, RootState } from 'soapbox/store.ts';
 import type { APIEntity, Status, Tag } from 'soapbox/types/entities.ts';
 import type { History } from 'soapbox/types/history.ts';
@@ -512,9 +512,8 @@ const fetchComposeSuggestionsAccounts = throttle((dispatch, getState, composeId,
   });
 }, 200, { leading: true, trailing: true });
 
-const fetchComposeSuggestionsEmojis = (dispatch: AppDispatch, getState: () => RootState, composeId: string, token: string) => {
-  const state = getState();
-  const results = emojiSearch(token.replace(':', ''), { maxResults: 10 }, state.custom_emojis);
+const fetchComposeSuggestionsEmojis = (dispatch: AppDispatch, composeId: string, token: string, customEmojis: CustomEmoji[]) => {
+  const results = emojiSearch(token.replace(':', ''), { maxResults: 10 }, customEmojis);
 
   dispatch(readyComposeSuggestionsEmojis(composeId, token, results));
 };
@@ -553,11 +552,11 @@ const fetchComposeSuggestionsTags = (dispatch: AppDispatch, getState: () => Root
   });
 };
 
-const fetchComposeSuggestions = (composeId: string, token: string) =>
+const fetchComposeSuggestions = (composeId: string, token: string, customEmojis: CustomEmoji[]) =>
   (dispatch: AppDispatch, getState: () => RootState) => {
     switch (token[0]) {
       case ':':
-        fetchComposeSuggestionsEmojis(dispatch, getState, composeId, token);
+        fetchComposeSuggestionsEmojis(dispatch, composeId, token, customEmojis);
         break;
       case '#':
         fetchComposeSuggestionsTags(dispatch, getState, composeId, token);
diff --git a/src/actions/custom-emojis.ts b/src/actions/custom-emojis.ts
deleted file mode 100644
index ad71b5c79..000000000
--- a/src/actions/custom-emojis.ts
+++ /dev/null
@@ -1,49 +0,0 @@
-import api from '../api/index.ts';
-
-import type { AppDispatch, RootState } from 'soapbox/store.ts';
-import type { APIEntity } from 'soapbox/types/entities.ts';
-
-const CUSTOM_EMOJIS_FETCH_REQUEST = 'CUSTOM_EMOJIS_FETCH_REQUEST';
-const CUSTOM_EMOJIS_FETCH_SUCCESS = 'CUSTOM_EMOJIS_FETCH_SUCCESS';
-const CUSTOM_EMOJIS_FETCH_FAIL = 'CUSTOM_EMOJIS_FETCH_FAIL';
-
-const fetchCustomEmojis = () =>
-  (dispatch: AppDispatch, getState: () => RootState) => {
-    const me = getState().me;
-    if (!me) return;
-
-    dispatch(fetchCustomEmojisRequest());
-
-    api(getState).get('/api/v1/custom_emojis').then(response => {
-      dispatch(fetchCustomEmojisSuccess(response.data));
-    }).catch(error => {
-      dispatch(fetchCustomEmojisFail(error));
-    });
-  };
-
-const fetchCustomEmojisRequest = () => ({
-  type: CUSTOM_EMOJIS_FETCH_REQUEST,
-  skipLoading: true,
-});
-
-const fetchCustomEmojisSuccess = (custom_emojis: APIEntity[]) => ({
-  type: CUSTOM_EMOJIS_FETCH_SUCCESS,
-  custom_emojis,
-  skipLoading: true,
-});
-
-const fetchCustomEmojisFail = (error: unknown) => ({
-  type: CUSTOM_EMOJIS_FETCH_FAIL,
-  error,
-  skipLoading: true,
-});
-
-export {
-  CUSTOM_EMOJIS_FETCH_REQUEST,
-  CUSTOM_EMOJIS_FETCH_SUCCESS,
-  CUSTOM_EMOJIS_FETCH_FAIL,
-  fetchCustomEmojis,
-  fetchCustomEmojisRequest,
-  fetchCustomEmojisSuccess,
-  fetchCustomEmojisFail,
-};
diff --git a/src/api/hooks/useCustomEmojis.ts b/src/api/hooks/useCustomEmojis.ts
new file mode 100644
index 000000000..0104466ce
--- /dev/null
+++ b/src/api/hooks/useCustomEmojis.ts
@@ -0,0 +1,29 @@
+import { useQuery } from '@tanstack/react-query';
+
+import { autosuggestPopulate } from 'soapbox/features/emoji/search.ts';
+import { useApi } from 'soapbox/hooks/useApi.ts';
+import { CustomEmoji, customEmojiSchema } from 'soapbox/schemas/custom-emoji.ts';
+import { filteredArray } from 'soapbox/schemas/utils.ts';
+
+/** Get the Instance for the current backend. */
+export function useCustomEmojis() {
+  const api = useApi();
+
+  const { data: customEmojis = [], ...rest } = useQuery<CustomEmoji[]>({
+    queryKey: ['customEmojis', api.baseUrl],
+    queryFn: async () => {
+      const response = await api.get('/api/v1/custom_emojis');
+      const data = await response.json();
+      const customEmojis = filteredArray(customEmojiSchema).parse(data);
+
+      // Add custom emojis to the search index.
+      autosuggestPopulate(customEmojis);
+
+      return customEmojis;
+    },
+    placeholderData: [],
+    retryOnMount: false,
+  });
+
+  return { customEmojis, ...rest };
+}
diff --git a/src/components/announcements/announcement.tsx b/src/components/announcements/announcement.tsx
index 35aa9f4f1..934052972 100644
--- a/src/components/announcements/announcement.tsx
+++ b/src/components/announcements/announcement.tsx
@@ -8,15 +8,13 @@ import { getTextDirection } from 'soapbox/utils/rtl.ts';
 import AnnouncementContent from './announcement-content.tsx';
 import ReactionsBar from './reactions-bar.tsx';
 
-import type { Map as ImmutableMap } from 'immutable';
 import type { Announcement as AnnouncementEntity } from 'soapbox/schemas/index.ts';
 
 interface IAnnouncement {
   announcement: AnnouncementEntity;
-  emojiMap: ImmutableMap<string, ImmutableMap<string, string>>;
 }
 
-const Announcement: React.FC<IAnnouncement> = ({ announcement, emojiMap }) => {
+const Announcement: React.FC<IAnnouncement> = ({ announcement }) => {
   const features = useFeatures();
 
   const startsAt = announcement.starts_at && new Date(announcement.starts_at);
@@ -64,7 +62,6 @@ const Announcement: React.FC<IAnnouncement> = ({ announcement, emojiMap }) => {
         <ReactionsBar
           reactions={announcement.reactions}
           announcementId={announcement.id}
-          emojiMap={emojiMap}
         />
       )}
     </Stack>
diff --git a/src/components/announcements/announcements-panel.tsx b/src/components/announcements/announcements-panel.tsx
index 5d6cb66e2..84540954c 100644
--- a/src/components/announcements/announcements-panel.tsx
+++ b/src/components/announcements/announcements-panel.tsx
@@ -1,26 +1,17 @@
 import clsx from 'clsx';
-import { List as ImmutableList, Map as ImmutableMap } from 'immutable';
 import { useState } from 'react';
 import { FormattedMessage } from 'react-intl';
 import ReactSwipeableViews from 'react-swipeable-views';
-import { createSelector } from 'reselect';
 
 import { useAnnouncements } from 'soapbox/api/hooks/announcements/index.ts';
 import { Card } from 'soapbox/components/ui/card.tsx';
 import HStack from 'soapbox/components/ui/hstack.tsx';
 import Widget from 'soapbox/components/ui/widget.tsx';
-import { useAppSelector } from 'soapbox/hooks/useAppSelector.ts';
 
 import Announcement from './announcement.tsx';
 
-import type { RootState } from 'soapbox/store.ts';
-
-const customEmojiMap = createSelector([(state: RootState) => state.custom_emojis], items => (items as ImmutableList<ImmutableMap<string, string>>).reduce((map, emoji) => map.set(emoji.get('shortcode')!, emoji), ImmutableMap<string, ImmutableMap<string, string>>()));
-
 const AnnouncementsPanel = () => {
-  const emojiMap = useAppSelector(state => customEmojiMap(state));
   const [index, setIndex] = useState(0);
-
   const { data: announcements } = useAnnouncements();
 
   if (!announcements || announcements.length === 0) return null;
@@ -37,7 +28,6 @@ const AnnouncementsPanel = () => {
             <Announcement
               key={announcement.id}
               announcement={announcement}
-              emojiMap={emojiMap}
             />
           )).reverse()}
         </ReactSwipeableViews>
diff --git a/src/components/announcements/emoji.tsx b/src/components/announcements/emoji.tsx
index f9994ec47..3380ddb9e 100644
--- a/src/components/announcements/emoji.tsx
+++ b/src/components/announcements/emoji.tsx
@@ -1,34 +1,20 @@
-import unicodeMapping from 'soapbox/features/emoji/mapping.ts';
+import { useCustomEmojis } from 'soapbox/api/hooks/useCustomEmojis.ts';
+import NativeEmoji from 'soapbox/components/ui/emoji.tsx';
 import { useSettings } from 'soapbox/hooks/useSettings.ts';
 
-import type { Map as ImmutableMap } from 'immutable';
-
 interface IEmoji {
   emoji: string;
-  emojiMap: ImmutableMap<string, ImmutableMap<string, string>>;
   hovered: boolean;
 }
 
-const Emoji: React.FC<IEmoji> = ({ emoji, emojiMap, hovered }) => {
+const Emoji: React.FC<IEmoji> = ({ emoji, hovered }) => {
   const { autoPlayGif } = useSettings();
+  const { customEmojis } = useCustomEmojis();
 
-  // @ts-ignore
-  if (unicodeMapping[emoji]) {
-    // @ts-ignore
-    const { filename, shortCode } = unicodeMapping[emoji];
-    const title = shortCode ? `:${shortCode}:` : '';
+  const custom = customEmojis.find((x) => x.shortcode === emoji);
 
-    return (
-      <img
-        draggable='false'
-        className='emojione m-0 block'
-        alt={emoji}
-        title={title}
-        src={`/packs/emoji/${filename}.svg`}
-      />
-    );
-  } else if (emojiMap.get(emoji as any)) {
-    const filename  = (autoPlayGif || hovered) ? emojiMap.getIn([emoji, 'url']) : emojiMap.getIn([emoji, 'static_url']);
+  if (custom) {
+    const filename  = (autoPlayGif || hovered) ? custom.url : custom.static_url;
     const shortCode = `:${emoji}:`;
 
     return (
@@ -40,9 +26,9 @@ const Emoji: React.FC<IEmoji> = ({ emoji, emojiMap, hovered }) => {
         src={filename as string}
       />
     );
-  } else {
-    return null;
   }
+
+  return <NativeEmoji emoji={emoji} />;
 };
 
 export default Emoji;
diff --git a/src/components/announcements/reaction.tsx b/src/components/announcements/reaction.tsx
index ad9c0704e..7fbccb736 100644
--- a/src/components/announcements/reaction.tsx
+++ b/src/components/announcements/reaction.tsx
@@ -7,17 +7,15 @@ import unicodeMapping from 'soapbox/features/emoji/mapping.ts';
 
 import Emoji from './emoji.tsx';
 
-import type { Map as ImmutableMap } from 'immutable';
 import type { AnnouncementReaction } from 'soapbox/schemas/index.ts';
 
 interface IReaction {
   announcementId: string;
   reaction: AnnouncementReaction;
-  emojiMap: ImmutableMap<string, ImmutableMap<string, string>>;
   style: React.CSSProperties;
 }
 
-const Reaction: React.FC<IReaction> = ({ announcementId, reaction, emojiMap, style }) => {
+const Reaction: React.FC<IReaction> = ({ announcementId, reaction, style }) => {
   const [hovered, setHovered] = useState(false);
 
   const { addReaction, removeReaction } = useAnnouncements();
@@ -55,7 +53,7 @@ const Reaction: React.FC<IReaction> = ({ announcementId, reaction, emojiMap, sty
       style={style}
     >
       <span className='block size-4'>
-        <Emoji hovered={hovered} emoji={reaction.name} emojiMap={emojiMap} />
+        <Emoji hovered={hovered} emoji={reaction.name} />
       </span>
       <span className='block min-w-[9px] text-center text-xs font-medium text-primary-600 dark:text-white'>
         <AnimatedNumber value={reaction.count} />
diff --git a/src/components/announcements/reactions-bar.tsx b/src/components/announcements/reactions-bar.tsx
index 18f7243d4..56f52ffb7 100644
--- a/src/components/announcements/reactions-bar.tsx
+++ b/src/components/announcements/reactions-bar.tsx
@@ -7,17 +7,15 @@ import { useSettings } from 'soapbox/hooks/useSettings.ts';
 
 import Reaction from './reaction.tsx';
 
-import type { Map as ImmutableMap } from 'immutable';
 import type { Emoji, NativeEmoji } from 'soapbox/features/emoji/index.ts';
 import type { AnnouncementReaction } from 'soapbox/schemas/index.ts';
 
 interface IReactionsBar {
   announcementId: string;
   reactions: AnnouncementReaction[];
-  emojiMap: ImmutableMap<string, ImmutableMap<string, string>>;
 }
 
-const ReactionsBar: React.FC<IReactionsBar> = ({ announcementId, reactions, emojiMap }) => {
+const ReactionsBar: React.FC<IReactionsBar> = ({ announcementId, reactions }) => {
   const { reduceMotion } = useSettings();
   const { addReaction } = useAnnouncements();
 
@@ -47,7 +45,6 @@ const ReactionsBar: React.FC<IReactionsBar> = ({ announcementId, reactions, emoj
               reaction={data}
               style={{ transform: `scale(${style.scale})`, position: style.scale < 0.5 ? 'absolute' : 'static' }}
               announcementId={announcementId}
-              emojiMap={emojiMap}
             />
           ))}
 
diff --git a/src/features/compose/components/compose-form.tsx b/src/features/compose/components/compose-form.tsx
index d68626efc..1e4b4da68 100644
--- a/src/features/compose/components/compose-form.tsx
+++ b/src/features/compose/components/compose-form.tsx
@@ -15,6 +15,7 @@ import {
   selectComposeSuggestion,
   uploadCompose,
 } from 'soapbox/actions/compose.ts';
+import { useCustomEmojis } from 'soapbox/api/hooks/useCustomEmojis.ts';
 import AutosuggestInput, { AutoSuggestion } from 'soapbox/components/autosuggest-input.tsx';
 import Button from 'soapbox/components/ui/button.tsx';
 import HStack from 'soapbox/components/ui/hstack.tsx';
@@ -109,6 +110,7 @@ const ComposeForm = <ID extends string>({ id, shouldCondense, autoFocus, clickab
   const spoilerTextRef = useRef<AutosuggestInput>(null);
   const editorRef = useRef<LexicalEditor>(null);
   const { isDraggedOver } = useDraggedFiles(formRef);
+  const { customEmojis } = useCustomEmojis();
 
   const text = editorRef.current?.getEditorState().read(() => $getRoot().getTextContent()) ?? '';
   const fulltext = [spoilerText, countableText(text)].join('');
@@ -161,8 +163,8 @@ const ComposeForm = <ID extends string>({ id, shouldCondense, autoFocus, clickab
     dispatch(clearComposeSuggestions(id));
   };
 
-  const onSuggestionsFetchRequested = (token: string | number) => {
-    dispatch(fetchComposeSuggestions(id, token as string));
+  const onSuggestionsFetchRequested = (token: string) => {
+    dispatch(fetchComposeSuggestions(id, token, customEmojis));
   };
 
   const onSpoilerSuggestionSelected = (tokenStart: number, token: string | null, value: AutoSuggestion) => {
diff --git a/src/features/compose/components/polls/poll-form.tsx b/src/features/compose/components/polls/poll-form.tsx
index 4ef1043aa..98313325e 100644
--- a/src/features/compose/components/polls/poll-form.tsx
+++ b/src/features/compose/components/polls/poll-form.tsx
@@ -1,6 +1,7 @@
 import { defineMessages, FormattedMessage, useIntl } from 'react-intl';
 
 import { addPollOption, changePollOption, changePollSettings, clearComposeSuggestions, fetchComposeSuggestions, removePoll, removePollOption, selectComposeSuggestion } from 'soapbox/actions/compose.ts';
+import { useCustomEmojis } from 'soapbox/api/hooks/useCustomEmojis.ts';
 import AutosuggestInput from 'soapbox/components/autosuggest-input.tsx';
 import Button from 'soapbox/components/ui/button.tsx';
 import Divider from 'soapbox/components/ui/divider.tsx';
@@ -55,6 +56,7 @@ const Option: React.FC<IOption> = ({
   const intl = useIntl();
 
   const suggestions = useCompose(composeId).suggestions;
+  const { customEmojis } = useCustomEmojis();
 
   const handleOptionTitleChange = (event: React.ChangeEvent<HTMLInputElement>) => onChange(index, event.target.value);
 
@@ -68,7 +70,7 @@ const Option: React.FC<IOption> = ({
 
   const onSuggestionsClearRequested = () => dispatch(clearComposeSuggestions(composeId));
 
-  const onSuggestionsFetchRequested = (token: string) => dispatch(fetchComposeSuggestions(composeId, token));
+  const onSuggestionsFetchRequested = (token: string) => dispatch(fetchComposeSuggestions(composeId, token, customEmojis));
 
   const onSuggestionSelected = (tokenStart: number, token: string | null, value: AutoSuggestion) => {
     if (token && typeof token === 'string') {
diff --git a/src/features/compose/editor/plugins/autosuggest-plugin.tsx b/src/features/compose/editor/plugins/autosuggest-plugin.tsx
index af5eb3e66..984dea262 100644
--- a/src/features/compose/editor/plugins/autosuggest-plugin.tsx
+++ b/src/features/compose/editor/plugins/autosuggest-plugin.tsx
@@ -35,6 +35,7 @@ import ReactDOM from 'react-dom';
 
 import { clearComposeSuggestions, fetchComposeSuggestions } from 'soapbox/actions/compose.ts';
 import { chooseEmoji } from 'soapbox/actions/emojis.ts';
+import { useCustomEmojis } from 'soapbox/api/hooks/useCustomEmojis.ts';
 import AutosuggestEmoji from 'soapbox/components/autosuggest-emoji.tsx';
 import { isNativeEmoji } from 'soapbox/features/emoji/index.ts';
 import { useAppDispatch } from 'soapbox/hooks/useAppDispatch.ts';
@@ -278,6 +279,7 @@ const AutosuggestPlugin = ({
   setSuggestionsHidden,
 }: AutosuggestPluginProps): JSX.Element | null => {
   const { suggestions } = useCompose(composeId);
+  const { customEmojis } = useCustomEmojis();
   const dispatch = useAppDispatch();
 
   const [editor] = useLexicalComposerContext();
@@ -410,7 +412,7 @@ const AutosuggestPlugin = ({
           return;
         }
 
-        dispatch(fetchComposeSuggestions(composeId, match.matchingString.trim()));
+        dispatch(fetchComposeSuggestions(composeId, match.matchingString.trim(), customEmojis));
 
         if (!isSelectionOnEntityBoundary(editor, match.leadOffset)) {
           const isRangePositioned = tryToPositionRange(match.leadOffset, range);
diff --git a/src/features/emoji/components/emoji-picker-dropdown.tsx b/src/features/emoji/components/emoji-picker-dropdown.tsx
index 3a528c267..2f8445cb2 100644
--- a/src/features/emoji/components/emoji-picker-dropdown.tsx
+++ b/src/features/emoji/components/emoji-picker-dropdown.tsx
@@ -5,6 +5,7 @@ import { createSelector } from 'reselect';
 
 import { chooseEmoji } from 'soapbox/actions/emojis.ts';
 import { changeSetting } from 'soapbox/actions/settings.ts';
+import { useCustomEmojis } from 'soapbox/api/hooks/useCustomEmojis.ts';
 import { buildCustomEmojis } from 'soapbox/features/emoji/index.ts';
 import { EmojiPicker } from 'soapbox/features/ui/util/async-components.ts';
 import { useAppDispatch } from 'soapbox/hooks/useAppDispatch.ts';
@@ -13,6 +14,7 @@ import { useTheme } from 'soapbox/hooks/useTheme.ts';
 import { RootState } from 'soapbox/store.ts';
 
 import type { Emoji, CustomEmoji, NativeEmoji } from 'soapbox/features/emoji/index.ts';
+import type { CustomEmoji as MastodonCustomEmoji } from 'soapbox/schemas/custom-emoji.ts';
 
 export const messages = defineMessages({
   emoji: { id: 'emoji_button.label', defaultMessage: 'Insert emoji' },
@@ -90,20 +92,21 @@ export const getFrequentlyUsedEmojis = createSelector([
   return emojis;
 });
 
-const getCustomEmojis = createSelector([
-  (state: RootState) => state.custom_emojis,
-], emojis => emojis.filter(e => e.get('visible_in_picker')).sort((a, b) => {
-  const aShort = a.get('shortcode')!.toLowerCase();
-  const bShort = b.get('shortcode')!.toLowerCase();
+/** Filter custom emojis to only ones visible in the picker, and sort them alphabetically. */
+function filterCustomEmojis(customEmojis: MastodonCustomEmoji[]) {
+  return customEmojis.filter(e => e.visible_in_picker).sort((a, b) => {
+    const aShort = a.shortcode.toLowerCase();
+    const bShort = b.shortcode.toLowerCase();
 
-  if (aShort < bShort) {
-    return -1;
-  } else if (aShort > bShort) {
-    return 1;
-  } else {
-    return 0;
-  }
-}));
+    if (aShort < bShort) {
+      return -1;
+    } else if (aShort > bShort) {
+      return 1;
+    } else {
+      return 0;
+    }
+  });
+}
 
 interface IRenderAfter {
   children: React.ReactNode;
@@ -137,7 +140,7 @@ const EmojiPickerDropdown: React.FC<IEmojiPickerDropdown> = ({
   const title = intl.formatMessage(messages.emoji);
   const theme = useTheme();
 
-  const customEmojis = useAppSelector((state) => getCustomEmojis(state));
+  const { customEmojis } = useCustomEmojis();
   const frequentlyUsedEmojis = useAppSelector((state) => getFrequentlyUsedEmojis(state));
 
   const handlePick = (emoji: any) => {
@@ -226,7 +229,7 @@ const EmojiPickerDropdown: React.FC<IEmojiPickerDropdown> = ({
     <Suspense>
       <RenderAfter update={update ?? (() => {})}>
         <EmojiPicker
-          custom={withCustom ? [{ emojis: buildCustomEmojis(customEmojis) }] : undefined}
+          custom={withCustom ? [{ emojis: buildCustomEmojis(filterCustomEmojis(customEmojis)) }] : undefined}
           title={title}
           onEmojiSelect={handlePick}
           recent={frequentlyUsedEmojis}
diff --git a/src/features/emoji/index.ts b/src/features/emoji/index.ts
index 1efed4fcb..a19990a05 100644
--- a/src/features/emoji/index.ts
+++ b/src/features/emoji/index.ts
@@ -3,6 +3,7 @@ import split from 'graphemesplit';
 import unicodeMapping from './mapping.ts';
 
 import type { Emoji as EmojiMart, CustomEmoji as EmojiMartCustom } from 'soapbox/features/emoji/data.ts';
+import type { CustomEmoji as MastodonCustomEmoji } from 'soapbox/schemas/custom-emoji.ts';
 
 /*
  * TODO: Consolate emoji object types
@@ -206,13 +207,13 @@ const emojify = (str: string, customEmojis = {}) => {
 
 export default emojify;
 
-export const buildCustomEmojis = (customEmojis: any) => {
+export function buildCustomEmojis(customEmojis: MastodonCustomEmoji[]): EmojiMart<EmojiMartCustom>[] {
   const emojis: EmojiMart<EmojiMartCustom>[] = [];
 
-  customEmojis.forEach((emoji: any) => {
-    const shortcode = emoji.get('shortcode');
-    const url       = emoji.get('static_url');
-    const name      = shortcode.replace(':', '');
+  customEmojis.forEach((emoji) => {
+    const shortcode = emoji.shortcode;
+    const url = emoji.url;
+    const name = shortcode.replace(':', '');
 
     emojis.push({
       id: name,
@@ -223,4 +224,4 @@ export const buildCustomEmojis = (customEmojis: any) => {
   });
 
   return emojis;
-};
+}
diff --git a/src/features/emoji/search.test.ts b/src/features/emoji/search.test.ts
index fb64cbbc4..4d2982e5a 100644
--- a/src/features/emoji/search.test.ts
+++ b/src/features/emoji/search.test.ts
@@ -1,4 +1,3 @@
-import { List, Map } from 'immutable';
 import pick from 'lodash/pick';
 import { describe, expect, it } from 'vitest';
 
@@ -35,13 +34,19 @@ describe('emoji_index', () => {
         id: 'mastodon',
         name: 'mastodon',
         keywords: ['mastodon'],
-        skins: { src: 'http://example.com' },
+        skins: [{ src: 'http://example.com' }],
       },
     ];
 
-    const custom_emojis = List([
-      Map({ static_url: 'http://example.com', shortcode: 'mastodon' }),
-    ]);
+    const customEmojis = [
+      {
+        category: '',
+        url: 'http://example.com/mastodon.png',
+        static_url: 'http://example.com/mastodon.png',
+        shortcode: 'mastodon',
+        visible_in_picker: true,
+      },
+    ];
 
     const lightExpected = [
       {
@@ -51,7 +56,7 @@ describe('emoji_index', () => {
     ];
 
     addCustomToPool(custom);
-    expect(search('masto', {}, custom_emojis).map(trimEmojis)).toEqual(lightExpected);
+    expect(search('masto', {}, customEmojis).map(trimEmojis)).toEqual(lightExpected);
   });
 
   it('updates custom emoji if another is passed', () => {
@@ -60,7 +65,7 @@ describe('emoji_index', () => {
         id: 'mastodon',
         name: 'mastodon',
         keywords: ['mastodon'],
-        skins: { src: 'http://example.com' },
+        skins: [{ src: 'http://example.com' }],
       },
     ];
 
@@ -71,18 +76,24 @@ describe('emoji_index', () => {
         id: 'pleroma',
         name: 'pleroma',
         keywords: ['pleroma'],
-        skins: { src: 'http://example.com' },
+        skins: [{ src: 'http://example.com' }],
       },
     ];
 
     addCustomToPool(custom2);
 
-    const custom_emojis = List([
-      Map({ static_url: 'http://example.com', shortcode: 'pleroma' }),
-    ]);
+    const customEmojis = [
+      {
+        category: '',
+        url: 'http://example.com/pleroma.png',
+        static_url: 'http://example.com/pleroma.png',
+        shortcode: 'pleroma',
+        visible_in_picker: true,
+      },
+    ];
 
     const expected: any = [];
-    expect(search('masto', {}, custom_emojis).map(trimEmojis)).toEqual(expected);
+    expect(search('masto', {}, customEmojis).map(trimEmojis)).toEqual(expected);
   });
 
   it('does an emoji whose unified name is irregular', () => {
diff --git a/src/features/emoji/search.ts b/src/features/emoji/search.ts
index 695a2ae37..8151ee48e 100644
--- a/src/features/emoji/search.ts
+++ b/src/features/emoji/search.ts
@@ -1,10 +1,10 @@
 // @ts-ignore
 import Index from '@akryum/flexsearch-es';
-import { Map as ImmutableMap, List as ImmutableList } from 'immutable';
 
-import data from './data.ts';
+import data, { Emoji as EmojiMart, CustomEmoji as EmojiMartCustom } from 'soapbox/features/emoji/data.ts';
+import { CustomEmoji } from 'soapbox/schemas/custom-emoji.ts';
 
-import type { Emoji } from './index.ts';
+import { buildCustomEmojis, type Emoji } from './index.ts';
 
 // @ts-ignore Wrong default export.
 const index: Index.Index = new Index({
@@ -23,8 +23,7 @@ export interface searchOptions {
   custom?: any;
 }
 
-export const addCustomToPool = (customEmojis: any[]) => {
-  // @ts-ignore
+export function addCustomToPool(customEmojis: EmojiMart<EmojiMartCustom>[]): void {
   for (const key in index.register) {
     if (key[0] === 'c') {
       index.remove(key); // remove old custom emojis
@@ -36,27 +35,27 @@ export const addCustomToPool = (customEmojis: any[]) => {
   for (const emoji of customEmojis) {
     index.add('c' + i++, emoji.id);
   }
-};
+}
 
 // we can share an index by prefixing custom emojis with 'c' and native with 'n'
 const search = (
   str: string, { maxResults = 5 }: searchOptions = {},
-  custom_emojis?: ImmutableList<ImmutableMap<string, string>>,
+  customEmojis?: CustomEmoji[],
 ): Emoji[] => {
   return index.search(str, maxResults)
     .flatMap((id: any) => {
       if (typeof id !== 'string') return;
 
-      if (id[0] === 'c' && custom_emojis) {
+      if (id[0] === 'c' && customEmojis) {
         const index = Number(id.slice(1));
-        const custom = custom_emojis.get(index);
+        const custom = customEmojis[index];
 
         if (custom) {
           return {
-            id: custom.get('shortcode', ''),
-            colons: ':' + custom.get('shortcode', '') + ':',
+            id: custom.shortcode,
+            colons: ':' + custom.shortcode + ':',
             custom: true,
-            imageUrl: custom.get('static_url', ''),
+            imageUrl: custom.url,
           };
         }
       }
@@ -74,4 +73,9 @@ const search = (
     }).filter(Boolean) as Emoji[];
 };
 
+/** Import Mastodon custom emojis as emoji mart custom emojis. */
+export function autosuggestPopulate(emojis: CustomEmoji[]) {
+  addCustomToPool(buildCustomEmojis(emojis));
+}
+
 export default search;
diff --git a/src/features/ui/index.tsx b/src/features/ui/index.tsx
index 6dbe3412d..59fdea8d9 100644
--- a/src/features/ui/index.tsx
+++ b/src/features/ui/index.tsx
@@ -4,7 +4,6 @@ import { Switch, useHistory, useLocation, Redirect } from 'react-router-dom';
 
 import { fetchFollowRequests } from 'soapbox/actions/accounts.ts';
 import { fetchReports, fetchUsers, fetchConfig } from 'soapbox/actions/admin.ts';
-import { fetchCustomEmojis } from 'soapbox/actions/custom-emojis.ts';
 import { fetchFilters } from 'soapbox/actions/filters.ts';
 import { fetchMarker } from 'soapbox/actions/markers.ts';
 import { expandNotifications } from 'soapbox/actions/notifications.ts';
@@ -13,6 +12,7 @@ import { fetchScheduledStatuses } from 'soapbox/actions/scheduled-statuses.ts';
 import { fetchSuggestionsForTimeline } from 'soapbox/actions/suggestions.ts';
 import { expandHomeTimeline } from 'soapbox/actions/timelines.ts';
 import { useUserStream } from 'soapbox/api/hooks/index.ts';
+import { useCustomEmojis } from 'soapbox/api/hooks/useCustomEmojis.ts';
 import SidebarNavigation from 'soapbox/components/sidebar-navigation.tsx';
 import ThumbNavigation from 'soapbox/components/thumb-navigation.tsx';
 import Layout from 'soapbox/components/ui/layout.tsx';
@@ -472,11 +472,11 @@ const UI: React.FC<IUI> = ({ children }) => {
   }, []);
 
   useUserStream();
+  useCustomEmojis();
 
   // The user has logged in
   useEffect(() => {
     loadAccountData();
-    dispatch(fetchCustomEmojis());
   }, [!!account]);
 
   useEffect(() => {
diff --git a/src/reducers/custom-emojis.test.ts b/src/reducers/custom-emojis.test.ts
deleted file mode 100644
index 090c265fb..000000000
--- a/src/reducers/custom-emojis.test.ts
+++ /dev/null
@@ -1,10 +0,0 @@
-import { List as ImmutableList } from 'immutable';
-import { describe, expect, it } from 'vitest';
-
-import reducer from './custom-emojis.ts';
-
-describe('custom_emojis reducer', () => {
-  it('should return the initial state', () => {
-    expect(reducer(undefined, {} as any)).toEqual(ImmutableList());
-  });
-});
diff --git a/src/reducers/custom-emojis.ts b/src/reducers/custom-emojis.ts
deleted file mode 100644
index a3a57a7e3..000000000
--- a/src/reducers/custom-emojis.ts
+++ /dev/null
@@ -1,38 +0,0 @@
-import { List as ImmutableList, Map as ImmutableMap, fromJS } from 'immutable';
-
-import emojiData from 'soapbox/features/emoji/data.ts';
-import { buildCustomEmojis } from 'soapbox/features/emoji/index.ts';
-import { addCustomToPool } from 'soapbox/features/emoji/search.ts';
-
-import { CUSTOM_EMOJIS_FETCH_SUCCESS } from '../actions/custom-emojis.ts';
-
-import type { AnyAction } from 'redux';
-import type { APIEntity } from 'soapbox/types/entities.ts';
-
-const initialState = ImmutableList<ImmutableMap<string, string>>();
-
-// Populate custom emojis for composer autosuggest
-const autosuggestPopulate = (emojis: ImmutableList<ImmutableMap<string, string>>) => {
-  addCustomToPool(buildCustomEmojis(emojis));
-};
-
-const importEmojis = (customEmojis: APIEntity[]) => {
-  const emojis = (fromJS(customEmojis) as ImmutableList<ImmutableMap<string, string>>).filter((emoji) => {
-    // If a custom emoji has the shortcode of a Unicode emoji, skip it.
-    // Otherwise it breaks EmojiMart.
-    // https://gitlab.com/soapbox-pub/soapbox/-/issues/610
-    const shortcode = emoji.get('shortcode', '').toLowerCase();
-    return !emojiData.emojis[shortcode];
-  });
-
-  autosuggestPopulate(emojis);
-  return emojis;
-};
-
-export default function custom_emojis(state = initialState, action: AnyAction) {
-  if (action.type === CUSTOM_EMOJIS_FETCH_SUCCESS) {
-    return importEmojis(action.custom_emojis);
-  }
-
-  return state;
-}
diff --git a/src/reducers/index.ts b/src/reducers/index.ts
index e39c98910..21fae33b3 100644
--- a/src/reducers/index.ts
+++ b/src/reducers/index.ts
@@ -14,7 +14,6 @@ import compose_event from './compose-event.ts';
 import compose from './compose.ts';
 import contexts from './contexts.ts';
 import conversations from './conversations.ts';
-import custom_emojis from './custom-emojis.ts';
 import domain_lists from './domain-lists.ts';
 import dropdown_menu from './dropdown-menu.ts';
 import filters from './filters.ts';
@@ -69,7 +68,6 @@ export default combineReducers({
   compose_event,
   contexts,
   conversations,
-  custom_emojis,
   domain_lists,
   dropdown_menu,
   entities,