diff --git a/src/matrix/Client.js b/src/matrix/Client.js
index 0eb9f6e0..7423b431 100644
--- a/src/matrix/Client.js
+++ b/src/matrix/Client.js
@@ -337,6 +337,19 @@ export class Client {
         }
     }
 
+    /**
+     * Update the access token in use by the client.
+     * Will also update the token in session storage.
+     * @param {string} token A Matrix Access Token 
+     */
+    async updateAccessToken(token) {
+        if (!this._session) {
+            throw Error("No session loaded, cannot update access token");
+        }
+        this._session.updateAccessToken(token);
+        await this._platform.sessionInfoStorage.updateAccessToken(this._sessionId, token);
+    }
+
     async _waitForFirstSync() {
         this._sync.start();
         this._status.set(LoadStatus.FirstSync);
diff --git a/src/matrix/Session.js b/src/matrix/Session.js
index 3fc3b006..348b626b 100644
--- a/src/matrix/Session.js
+++ b/src/matrix/Session.js
@@ -1094,6 +1094,15 @@ export class Session {
             return body.room_id;
         });
     }
+
+    /**
+     * Updates the access token used by the API. Does NOT
+     * change the token in storage.
+     * @param {string} token 
+     */
+    updateAccessToken(token) {
+        this._hsApi.updateAccessToken(token);
+    }
 }
 
 import {FeatureSet} from "../features";
diff --git a/src/matrix/net/HomeServerApi.ts b/src/matrix/net/HomeServerApi.ts
index eebc692a..50e51c21 100644
--- a/src/matrix/net/HomeServerApi.ts
+++ b/src/matrix/net/HomeServerApi.ts
@@ -46,7 +46,7 @@ type BaseRequestOptions = {
 
 export class HomeServerApi {
     private readonly _homeserver: string;
-    private readonly _accessToken: string;
+    private _accessToken: string;
     private readonly _requestFn: RequestFunction;
     private readonly _reconnector: Reconnector;
 
@@ -125,6 +125,14 @@ export class HomeServerApi {
         return this._authedRequest("GET", this._url(csPath, options?.prefix || CS_R0_PREFIX), queryParams, body, options);
     }
 
+    /**
+     * Update the access token used by the API.
+     * @param token 
+     */
+    public updateAccessToken(token: string) {
+        this._accessToken = token;
+    }
+
     sync(since: string, filter: string, timeout: number, options?: BaseRequestOptions): IHomeServerRequest {
         return this._get("/sync", {since, timeout, filter}, undefined, options);
     }
diff --git a/src/matrix/sessioninfo/localstorage/SessionInfoStorage.ts b/src/matrix/sessioninfo/localstorage/SessionInfoStorage.ts
index d6596a61..795333bc 100644
--- a/src/matrix/sessioninfo/localstorage/SessionInfoStorage.ts
+++ b/src/matrix/sessioninfo/localstorage/SessionInfoStorage.ts
@@ -37,6 +37,7 @@ interface ISessionInfo {
 interface ISessionInfoStorage {
     getAll(): Promise<ISessionInfo[]>;
     updateLastUsed(id: string, timestamp: number): Promise<void>;
+    updateAccessToken(id: string, token: string): Promise<void>;
     get(id: string): Promise<ISessionInfo | undefined>;
     add(sessionInfo: ISessionInfo): Promise<void>;
     delete(sessionId: string): Promise<void>;
@@ -60,14 +61,22 @@ export class SessionInfoStorage implements ISessionInfoStorage {
         return Promise.resolve([]);
     }
 
+    async updateAccessToken(id: string, accessToken: string): Promise<void> {
+        const sessions = await this.getAll();
+        const session = sessions.find(session => session.id === id);
+        if (!session) {
+            throw Error('No session found');
+        }
+        session.accessToken = accessToken;
+        localStorage.setItem(this._name, JSON.stringify(sessions));
+    }
+
     async updateLastUsed(id: string, timestamp: number): Promise<void> {
         const sessions = await this.getAll();
-        if (sessions) {
-            const session = sessions.find(session => session.id === id);
-            if (session) {
-                session.lastUsed = timestamp;
-                localStorage.setItem(this._name, JSON.stringify(sessions));
-            }
+        const session = sessions.find(session => session.id === id);
+        if (session) {
+            session.lastUsed = timestamp;
+            localStorage.setItem(this._name, JSON.stringify(sessions));
         }
     }