diff --git a/src/BasePlatform.ts b/src/BasePlatform.ts
index d93bef9702..5b4b15cc67 100644
--- a/src/BasePlatform.ts
+++ b/src/BasePlatform.ts
@@ -348,7 +348,7 @@ export default abstract class BasePlatform {
     /**
      * Create and store a pickle key for encrypting libolm objects.
      * @param {string} userId the user ID for the user that the pickle key is for.
-     * @param {string} userId the device ID that the pickle key is for.
+     * @param {string} deviceId the device ID that the pickle key is for.
      * @returns {string|null} the pickle key, or null if the platform does not
      *     support storing pickle keys.
      */
diff --git a/src/Lifecycle.ts b/src/Lifecycle.ts
index 10f4569e54..76dee5ab55 100644
--- a/src/Lifecycle.ts
+++ b/src/Lifecycle.ts
@@ -20,7 +20,7 @@ limitations under the License.
 import { createClient } from 'matrix-js-sdk/src/matrix';
 import { InvalidStoreError } from "matrix-js-sdk/src/errors";
 import { MatrixClient } from "matrix-js-sdk/src/client";
-import { decryptAES, encryptAES } from "matrix-js-sdk/src/crypto/aes";
+import { decryptAES, encryptAES, IEncryptedPayload } from "matrix-js-sdk/src/crypto/aes";
 
 import { IMatrixClientCreds, MatrixClientPeg } from './MatrixClientPeg';
 import SecurityCustomisations from "./customisations/Security";
@@ -303,7 +303,7 @@ export interface IStoredSession {
     hsUrl: string;
     isUrl: string;
     hasAccessToken: boolean;
-    accessToken: string | object;
+    accessToken: string | IEncryptedPayload;
     userId: string;
     deviceId: string;
     isGuest: boolean;
@@ -350,7 +350,7 @@ export async function getStoredSessionVars(): Promise<IStoredSession> {
 }
 
 // The pickle key is a string of unspecified length and format.  For AES, we
-// need a 256-bit Uint8Array.  So we HKDF the pickle key to generate the AES
+// need a 256-bit Uint8Array. So we HKDF the pickle key to generate the AES
 // key.  The AES key should be zeroed after it is used.
 async function pickleKeyToAesKey(pickleKey: string): Promise<Uint8Array> {
     const pickleKeyBuffer = new Uint8Array(pickleKey.length);
diff --git a/src/components/views/dialogs/security/CreateCrossSigningDialog.tsx b/src/components/views/dialogs/security/CreateCrossSigningDialog.tsx
index b6a95e7a89..84dcfede4a 100644
--- a/src/components/views/dialogs/security/CreateCrossSigningDialog.tsx
+++ b/src/components/views/dialogs/security/CreateCrossSigningDialog.tsx
@@ -16,6 +16,8 @@ limitations under the License.
 */
 
 import React from 'react';
+import { CrossSigningKeys } from 'matrix-js-sdk/src/client';
+
 import { MatrixClientPeg } from '../../../../MatrixClientPeg';
 import { _t } from '../../../../languageHandler';
 import Modal from '../../../../Modal';
@@ -71,7 +73,7 @@ export default class CreateCrossSigningDialog extends React.PureComponent<IProps
 
     private async queryKeyUploadAuth(): Promise<void> {
         try {
-            await MatrixClientPeg.get().uploadDeviceSigningKeys(null, {});
+            await MatrixClientPeg.get().uploadDeviceSigningKeys(null, {} as CrossSigningKeys);
             // We should never get here: the server should always require
             // UI auth to upload device signing keys. If we do, we upload
             // no keys which would be a no-op.
diff --git a/src/stores/SetupEncryptionStore.ts b/src/stores/SetupEncryptionStore.ts
index 53a8966296..e969c64853 100644
--- a/src/stores/SetupEncryptionStore.ts
+++ b/src/stores/SetupEncryptionStore.ts
@@ -16,11 +16,12 @@ limitations under the License.
 
 import EventEmitter from 'events';
 import { VerificationRequest } from "matrix-js-sdk/src/crypto/verification/request/VerificationRequest";
-import { IKeyBackupVersion } from "matrix-js-sdk/src/crypto/keybackup";
+import { IKeyBackupInfo } from "matrix-js-sdk/src/crypto/keybackup";
 import { ISecretStorageKeyInfo } from "matrix-js-sdk/src/matrix";
+import { PHASE_DONE as VERIF_PHASE_DONE } from "matrix-js-sdk/src/crypto/verification/request/VerificationRequest";
+
 import { MatrixClientPeg } from '../MatrixClientPeg';
 import { accessSecretStorage, AccessCancelledError } from '../SecurityManager';
-import { PHASE_DONE as VERIF_PHASE_DONE } from "matrix-js-sdk/src/crypto/verification/request/VerificationRequest";
 
 export enum Phase {
     Loading = 0,
@@ -35,7 +36,7 @@ export class SetupEncryptionStore extends EventEmitter {
     private started: boolean;
     public phase: Phase;
     public verificationRequest: VerificationRequest;
-    public backupInfo: IKeyBackupVersion;
+    public backupInfo: IKeyBackupInfo;
     public keyId: string;
     public keyInfo: ISecretStorageKeyInfo;
     public hasDevicesToVerifyAgainst: boolean;