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/backend.tsconfig.json b/backend.tsconfig.json
index 8ef0f23c..99dc9f22 100644
--- a/backend.tsconfig.json
+++ b/backend.tsconfig.json
@@ -3,7 +3,10 @@
   "compilerOptions": {
     "target": "es6",
     "lib": ["es6"],
-    "types": ["google-apps-script"],
+    "types": ["google-apps-script", "google.script.client-side"],
     "verbatimModuleSyntax": false
-  }
+  },
+  "include": [
+    "src/backend/Drive-shim.d.ts"
+  ]
 }
diff --git a/package-lock.json b/package-lock.json
index 7158b155..6e3c543c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -22,7 +22,7 @@
         "@smui/linear-progress": "^7.0.0",
         "@smui/list": "^7.0.0",
         "@smui/top-app-bar": "^7.0.0",
-        "@types/google-apps-script": "^1.0.85",
+        "@types/google-apps-script": "^1.0.86",
         "@types/google.script.client-side": "^0.1.5",
         "@types/jest": "^29.5.14",
         "@types/node": "^22.9.3",
@@ -4067,10 +4067,11 @@
       }
     },
     "node_modules/@types/google-apps-script": {
-      "version": "1.0.85",
-      "resolved": "https://registry.npmjs.org/@types/google-apps-script/-/google-apps-script-1.0.85.tgz",
-      "integrity": "sha512-O5w3PxI75uqU4d7t24ukQtU87OZ2j0vQp3VWmx9sJ6PTwBRvGhMA+qWShKNetofI8TYaVd8tFzBQXgv3e7ycCQ==",
-      "dev": true
+      "version": "1.0.86",
+      "resolved": "https://registry.npmjs.org/@types/google-apps-script/-/google-apps-script-1.0.86.tgz",
+      "integrity": "sha512-w0tLty8vpApjIp+czorfcoY9k1nZSdQsg6lru3ZV6EWdNyXNsetIZPQnvBIihENAhcGwlogiDKx8z/57NYB3jA==",
+      "dev": true,
+      "license": "MIT"
     },
     "node_modules/@types/google.script.client-side": {
       "version": "0.1.5",
diff --git a/package.json b/package.json
index edde690a..b4332d69 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,7 @@
     "@smui/linear-progress": "^7.0.0",
     "@smui/list": "^7.0.0",
     "@smui/top-app-bar": "^7.0.0",
-    "@types/google-apps-script": "^1.0.85",
+    "@types/google-apps-script": "^1.0.86",
     "@types/google.script.client-side": "^0.1.5",
     "@types/jest": "^29.5.14",
     "@types/node": "^22.9.3",
diff --git a/src/backend/Drive-shim.d.ts b/src/backend/Drive-shim.d.ts
new file mode 100644
index 00000000..970f69ee
--- /dev/null
+++ b/src/backend/Drive-shim.d.ts
@@ -0,0 +1,2 @@
+// eslint-disable-next-line no-var, @typescript-eslint/naming-convention -- GAS global, needs var
+declare var Drive: GoogleAppsScript.Drive_v2;