diff --git a/lib/actions/user-actions.js b/lib/actions/user-actions.js
--- a/lib/actions/user-actions.js
+++ b/lib/actions/user-actions.js
@@ -10,6 +10,10 @@
   UpdateUserSettingsRequest,
   PolicyAcknowledgmentRequest,
 } from '../types/account-types.js';
+import type {
+  ClientAvatar,
+  UpdateUserAvatarRequest,
+} from '../types/avatar-types.js';
 import type { GetSessionPublicKeysArgs } from '../types/request-types.js';
 import type { UserSearchResult } from '../types/search-types.js';
 import type {
@@ -244,6 +248,19 @@
     await callServerEndpoint('policy_acknowledgment', policyRequest);
   };
 
+const updateUserAvatarActionTypes = Object.freeze({
+  started: 'UPDATE_USER_AVATAR_STARTED',
+  success: 'UPDATE_USER_AVATAR_SUCCESS',
+  failed: 'UPDATE_USER_AVATAR_FAILED',
+});
+const updateUserAvatar =
+  (
+    callServerEndpoint: CallServerEndpoint,
+  ): ((avatarDBContent: UpdateUserAvatarRequest) => Promise<?ClientAvatar>) =>
+  async avatarDBContent => {
+    return await callServerEndpoint('update_user_avatar', avatarDBContent);
+  };
+
 export {
   changeUserPasswordActionTypes,
   changeUserPassword,
@@ -265,4 +282,6 @@
   updateSubscriptionActionTypes,
   policyAcknowledgment,
   policyAcknowledgmentActionTypes,
+  updateUserAvatarActionTypes,
+  updateUserAvatar,
 };
diff --git a/lib/types/redux-types.js b/lib/types/redux-types.js
--- a/lib/types/redux-types.js
+++ b/lib/types/redux-types.js
@@ -12,6 +12,7 @@
   QueueActivityUpdatesPayload,
   SetThreadUnreadStatusPayload,
 } from './activity-types.js';
+import type { ClientAvatar, UpdateUserAvatarRequest } from './avatar-types.js';
 import type { CryptoStore } from './crypto-types.js';
 import type { ClientDBDraftInfo, DraftStore } from './draft-types.js';
 import type { EnabledApps, SupportedApps } from './enabled-apps.js';
@@ -917,6 +918,22 @@
   | {
       +type: 'RECORD_NOTIF_PERMISSION_ALERT',
       +payload: { +time: number },
+    }
+  | {
+      +type: 'UPDATE_USER_AVATAR_STARTED',
+      +payload: UpdateUserAvatarRequest,
+      +loadingInfo: LoadingInfo,
+    }
+  | {
+      +type: 'UPDATE_USER_AVATAR_SUCCESS',
+      +payload: ?ClientAvatar,
+      +loadingInfo: LoadingInfo,
+    }
+  | {
+      +type: 'UPDATE_USER_AVATAR_FAILED',
+      +error: true,
+      +payload: Error,
+      +loadingInfo: LoadingInfo,
     };
 
 export type ActionPayload = ?(Object | Array<*> | $ReadOnlyArray<*> | string);