diff --git a/__tests__/test-utils/gas-stubs.ts b/__tests__/test-utils/gas-stubs.ts
index c8ee51d5..391e49a2 100644
--- a/__tests__/test-utils/gas-stubs.ts
+++ b/__tests__/test-utils/gas-stubs.ts
@@ -40,7 +40,7 @@ export function mockedCommentsCollection(): GoogleAppsScript.Drive.Collection.Co
   };
 }
 
-export function mockedDrive(): GoogleAppsScript.Drive {
+export function mockedDrive(): GoogleAppsScript.Drive_v2 {
   return {
     newChannel: jest.fn<() => GoogleAppsScript.Drive.Schema.Channel>(),
     newChildReference:
diff --git a/src/backend/utils/SafeDriveService.ts b/src/backend/utils/SafeDriveService.ts
index 1449cb45..32f77d21 100644
--- a/src/backend/utils/SafeDriveService.ts
+++ b/src/backend/utils/SafeDriveService.ts
@@ -22,12 +22,13 @@ export class SafeDriveService_ {
   public readonly Replies: GoogleAppsScript.Drive.Collection.RepliesCollection;
 
   public constructor() {
-    if (Drive.Replies === undefined) {
+    if ((Drive as unknown as GoogleAppsScript.Drive_v2).Replies === undefined) {
       throw new Error();
     }
     this.Comments = new SafeCommentsCollection_();
     this.Drives = new SafeDrivesCollection_();
     this.Files = new SafeFilesCollection_();
-    this.Replies = Drive.Replies;
+    this.Replies =
+      Drive.Replies as unknown as GoogleAppsScript.Drive.Collection.RepliesCollection;
   }
 }
diff --git a/src/backend/utils/SafeDriveService/SafeCommentsCollection.ts b/src/backend/utils/SafeDriveService/SafeCommentsCollection.ts
index 090828d1..d916ffdb 100644
--- a/src/backend/utils/SafeDriveService/SafeCommentsCollection.ts
+++ b/src/backend/utils/SafeDriveService/SafeCommentsCollection.ts
@@ -24,10 +24,13 @@ export class SafeCommentsCollection_ {
   private readonly unsafeComments: GoogleAppsScript.Drive.Collection.CommentsCollection;
 
   public constructor() {
-    if (Drive.Comments === undefined) {
+    if (
+      (Drive as unknown as GoogleAppsScript.Drive_v2).Comments === undefined
+    ) {
       throw new Error();
     }
-    this.unsafeComments = Drive.Comments;
+    this.unsafeComments =
+      Drive.Comments as unknown as GoogleAppsScript.Drive.Collection.CommentsCollection;
   }
 
   private static commentIsSafe(
diff --git a/src/backend/utils/SafeDriveService/SafeDrivesCollection.ts b/src/backend/utils/SafeDriveService/SafeDrivesCollection.ts
index 89cd8447..c61d387b 100644
--- a/src/backend/utils/SafeDriveService/SafeDrivesCollection.ts
+++ b/src/backend/utils/SafeDriveService/SafeDrivesCollection.ts
@@ -22,10 +22,11 @@ export class SafeDrivesCollection_ {
   private readonly unsafeDrives: GoogleAppsScript.Drive.Collection.DrivesCollection;
 
   public constructor() {
-    if (Drive.Drives === undefined) {
+    if ((Drive as unknown as GoogleAppsScript.Drive_v2).Drives === undefined) {
       throw new Error();
     }
-    this.unsafeDrives = Drive.Drives;
+    this.unsafeDrives =
+      Drive.Drives as unknown as GoogleAppsScript.Drive.Collection.DrivesCollection;
   }
 
   private static driveIsSafe<F extends DeepKeyof<SafeDrive>>(
diff --git a/src/backend/utils/SafeDriveService/SafeFilesCollection.ts b/src/backend/utils/SafeDriveService/SafeFilesCollection.ts
index 532d5e52..4e68dbd5 100644
--- a/src/backend/utils/SafeDriveService/SafeFilesCollection.ts
+++ b/src/backend/utils/SafeDriveService/SafeFilesCollection.ts
@@ -59,10 +59,11 @@ export class SafeFilesCollection_ {
   private readonly unsafeFiles: GoogleAppsScript.Drive.Collection.FilesCollection;
 
   public constructor() {
-    if (Drive.Files === undefined) {
+    if ((Drive as unknown as GoogleAppsScript.Drive_v2).Files === undefined) {
       throw new Error();
     }
-    this.unsafeFiles = Drive.Files;
+    this.unsafeFiles =
+      Drive.Files as unknown as GoogleAppsScript.Drive.Collection.FilesCollection;
   }
 
   private static fileIsSafe<F extends DeepKeyof<SafeFile>>(