diff --git a/.eslintrc.js b/.eslintrc.js
index 6fc5b99a671..1f5ce5cbd1e 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -52,6 +52,8 @@ module.exports = {
             "@typescript-eslint/no-explicit-any": "off",
             // We'd rather not do this but we do
             "@typescript-eslint/ban-ts-comment": "off",
+            // We're okay with assertion errors when we ask for them
+            "@typescript-eslint/no-non-null-assertion": "off",
 
             "quotes": "off",
             // We use a `logger` intermediary module
diff --git a/spec/unit/matrix-client.spec.ts b/spec/unit/matrix-client.spec.ts
index 489aa167950..795d1ae5c43 100644
--- a/spec/unit/matrix-client.spec.ts
+++ b/spec/unit/matrix-client.spec.ts
@@ -150,6 +150,10 @@ describe("MatrixClient", function() {
             }
             return Promise.resolve(next.data);
         }
+        // Jest doesn't let us have custom expectation errors, so if you're seeing this then
+        // you forgot to handle at least 1 pending request. Check your tests to ensure your
+        // number of expectations lines up with your number of requests made, and that those
+        // requests match your expectations.
         expect(true).toBe(false);
         return new Promise(() => {});
     }
@@ -1191,4 +1195,26 @@ describe("MatrixClient", function() {
             passwordTest({ auth, new_password: newPassword, logout_devices: false }, callback);
         });
     });
+
+    describe("getLocalAliases", () => {
+        it("should call the right endpoint", async () => {
+            const response = {
+                aliases: ["#woop:example.org", "#another:example.org"],
+            };
+            client.http.authedRequest.mockClear().mockResolvedValue(response);
+
+            const roomId = "!whatever:example.org";
+            const result = await client.getLocalAliases(roomId);
+
+            // Current version of the endpoint we support is v3
+            const [callback, method, path, queryParams, data, opts] = client.http.authedRequest.mock.calls[0];
+            expect(callback).toBeFalsy();
+            expect(data).toBeFalsy();
+            expect(method).toBe('GET');
+            expect(path).toEqual(`/rooms/${encodeURIComponent(roomId)}/aliases`);
+            expect(opts).toMatchObject({ prefix: "/_matrix/client/v3" });
+            expect(queryParams).toBeFalsy();
+            expect(result!.aliases).toEqual(response.aliases);
+        });
+    });
 });
diff --git a/src/client.ts b/src/client.ts
index 7d1787a2b08..f678eefdffe 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -61,6 +61,7 @@ import {
     PREFIX_R0,
     PREFIX_UNSTABLE,
     PREFIX_V1,
+    PREFIX_V3,
     retryNetworkOperation,
     UploadContentResponseType,
 } from "./http-api";
@@ -7531,16 +7532,16 @@ export class MatrixClient extends TypedEventEmitter<EmittedEvents, ClientEventHa
     }
 
     /**
-     * @param {string} roomId
-     * @param {module:client.callback} callback Optional.
+     * Gets the local aliases for the room. Note: this includes all local aliases, unlike the
+     * curated list from the m.room.canonical_alias state event.
+     * @param {string} roomId The room ID to get local aliases for.
      * @return {Promise} Resolves: an object with an `aliases` property, containing an array of local aliases
      * @return {module:http-api.MatrixError} Rejects: with an error response.
      */
-    public unstableGetLocalAliases(roomId: string, callback?: Callback): Promise<{ aliases: string[] }> {
-        const path = utils.encodeUri("/rooms/$roomId/aliases",
-            { $roomId: roomId });
-        const prefix = PREFIX_UNSTABLE + "/org.matrix.msc2432";
-        return this.http.authedRequest(callback, Method.Get, path, null, null, { prefix });
+    public getLocalAliases(roomId: string): Promise<{ aliases: string[] }> {
+        const path = utils.encodeUri("/rooms/$roomId/aliases", { $roomId: roomId });
+        const prefix = PREFIX_V3;
+        return this.http.authedRequest(undefined, Method.Get, path, null, null, { prefix });
     }
 
     /**
diff --git a/src/http-api.ts b/src/http-api.ts
index b6a5abb544b..23c692b1fb0 100644
--- a/src/http-api.ts
+++ b/src/http-api.ts
@@ -48,10 +48,15 @@ TODO:
 export const PREFIX_R0 = "/_matrix/client/r0";
 
 /**
- * A constant representing the URI path for release v1 of the Client-Server HTTP API.
+ * A constant representing the URI path for the legacy release v1 of the Client-Server HTTP API.
  */
 export const PREFIX_V1 = "/_matrix/client/v1";
 
+/**
+ * A constant representing the URI path for Client-Server API endpoints versioned at v3.
+ */
+export const PREFIX_V3 = "/_matrix/client/v3";
+
 /**
  * A constant representing the URI path for as-yet unspecified Client-Server HTTP APIs.
  */