diff --git a/src/hooks/useIsEncrypted.ts b/src/hooks/useIsEncrypted.ts
index a90b795a85..c9d3ed3bc8 100644
--- a/src/hooks/useIsEncrypted.ts
+++ b/src/hooks/useIsEncrypted.ts
@@ -6,24 +6,25 @@ SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only
 Please see LICENSE files in the repository root for full details.
 */
 
-import { useCallback, useState } from "react";
-import { MatrixClient, MatrixEvent, Room, RoomStateEvent, EventType } from "matrix-js-sdk/src/matrix";
+import { MatrixClient, MatrixEvent, Room, EventType } from "matrix-js-sdk/src/matrix";
 
-import { useTypedEventEmitter } from "./useEventEmitter";
+import { useRoomState } from "./useRoomState.ts";
+import { useAsyncMemo } from "./useAsyncMemo.ts";
 
-// Hook to simplify watching whether a Matrix room is encrypted, returns undefined if room is undefined
-export function useIsEncrypted(cli: MatrixClient, room?: Room): boolean | undefined {
-    const [isEncrypted, setIsEncrypted] = useState(room ? cli.isRoomEncrypted(room.roomId) : undefined);
-
-    const update = useCallback(
-        (event: MatrixEvent) => {
-            if (room && event.getType() === EventType.RoomEncryption) {
-                setIsEncrypted(cli.isRoomEncrypted(room.roomId));
-            }
-        },
-        [cli, room],
+// Hook to simplify watching whether a Matrix room is encrypted, returns null if room is undefined or the state is loading
+export function useIsEncrypted(cli: MatrixClient, room?: Room): boolean | null {
+    const encryptionStateEvent: MatrixEvent | undefined = useRoomState(
+        room,
+        (roomState) => roomState.getStateEvents(EventType.RoomEncryption)?.[0],
     );
-    useTypedEventEmitter(room?.currentState, RoomStateEvent.Events, update);
+    return useAsyncMemo(
+        async () => {
+            const crypto = cli.getCrypto();
+            if (!room || !crypto) return null;
 
-    return isEncrypted;
+            return crypto.isEncryptionEnabledInRoom(room.roomId);
+        },
+        [room, encryptionStateEvent],
+        null,
+    );
 }
diff --git a/test/unit-tests/components/views/right_panel/RoomSummaryCard-test.tsx b/test/unit-tests/components/views/right_panel/RoomSummaryCard-test.tsx
index a98552ea07..4026149f98 100644
--- a/test/unit-tests/components/views/right_panel/RoomSummaryCard-test.tsx
+++ b/test/unit-tests/components/views/right_panel/RoomSummaryCard-test.tsx
@@ -23,7 +23,7 @@ import * as settingsHooks from "../../../../../src/hooks/useSettings";
 import Modal from "../../../../../src/Modal";
 import RightPanelStore from "../../../../../src/stores/right-panel/RightPanelStore";
 import { RightPanelPhases } from "../../../../../src/stores/right-panel/RightPanelStorePhases";
-import { flushPromises, getMockClientWithEventEmitter, mockClientMethodsUser } from "../../../../test-utils";
+import { flushPromises, stubClient } from "../../../../test-utils";
 import { PollHistoryDialog } from "../../../../../src/components/views/dialogs/PollHistoryDialog";
 import { RoomPermalinkCreator } from "../../../../../src/utils/permalinks/Permalinks";
 import { _t } from "../../../../../src/languageHandler";
@@ -56,16 +56,7 @@ describe("<RoomSummaryCard />", () => {
     };
 
     beforeEach(() => {
-        mockClient = getMockClientWithEventEmitter({
-            ...mockClientMethodsUser(userId),
-            getAccountData: jest.fn(),
-            isRoomEncrypted: jest.fn(),
-            getOrCreateFilter: jest.fn().mockResolvedValue({ filterId: 1 }),
-            getRoom: jest.fn(),
-            isGuest: jest.fn().mockReturnValue(false),
-            deleteRoomTag: jest.fn().mockResolvedValue({}),
-            setRoomTag: jest.fn().mockResolvedValue({}),
-        });
+        mockClient = mocked(stubClient());
         room = new Room(roomId, mockClient, userId);
         const roomCreateEvent = new MatrixEvent({
             type: "m.room.create",
diff --git a/test/unit-tests/components/views/right_panel/UserInfo-test.tsx b/test/unit-tests/components/views/right_panel/UserInfo-test.tsx
index c9996d7d67..dbf5645ca8 100644
--- a/test/unit-tests/components/views/right_panel/UserInfo-test.tsx
+++ b/test/unit-tests/components/views/right_panel/UserInfo-test.tsx
@@ -134,6 +134,7 @@ beforeEach(() => {
         getUserDeviceInfo: jest.fn(),
         userHasCrossSigningKeys: jest.fn().mockResolvedValue(false),
         getUserVerificationStatus: jest.fn(),
+        isEncryptionEnabledInRoom: jest.fn().mockResolvedValue(false),
     } as unknown as CryptoApi);
 
     mockClient = mocked({
@@ -148,7 +149,6 @@ beforeEach(() => {
         on: jest.fn(),
         off: jest.fn(),
         isSynapseAdministrator: jest.fn().mockResolvedValue(false),
-        isRoomEncrypted: jest.fn().mockReturnValue(false),
         doesServerSupportUnstableFeature: jest.fn().mockReturnValue(false),
         doesServerSupportExtendedProfiles: jest.fn().mockResolvedValue(false),
         getExtendedProfileProperty: jest.fn().mockRejectedValue(new Error("Not supported")),
@@ -660,7 +660,7 @@ describe("<UserInfo />", () => {
 
     describe("with an encrypted room", () => {
         beforeEach(() => {
-            mockClient.isRoomEncrypted.mockReturnValue(true);
+            jest.spyOn(mockClient.getCrypto()!, "isEncryptionEnabledInRoom").mockResolvedValue(true);
         });
 
         it("renders unverified user info", async () => {