diff --git a/src/auto-reply/reply.directive.directive-behavior.e2e-mocks.ts b/src/auto-reply/reply.directive.directive-behavior.e2e-mocks.ts
index 77b86bee3d2..5199ba84887 100644
--- a/src/auto-reply/reply.directive.directive-behavior.e2e-mocks.ts
+++ b/src/auto-reply/reply.directive.directive-behavior.e2e-mocks.ts
@@ -1,6 +1,6 @@
-import { vi } from "vitest";
+import { vi, type Mock } from "vitest";
 
-export const runEmbeddedPiAgentMock = vi.fn();
+export const runEmbeddedPiAgentMock: Mock = vi.fn();
 
 vi.mock("../agents/pi-embedded.js", () => ({
   abortEmbeddedPiRun: vi.fn().mockReturnValue(false),
diff --git a/src/config/sessions.test.ts b/src/config/sessions.test.ts
index 2ea4133029f..26996073e8d 100644
--- a/src/config/sessions.test.ts
+++ b/src/config/sessions.test.ts
@@ -684,7 +684,12 @@ describe("sessions", () => {
     });
 
     const createDeferred = <T>() => {
-      const { promise, resolve, reject } = Promise.withResolvers<T>();
+      let resolve!: (value: T | PromiseLike<T>) => void;
+      let reject!: (reason?: unknown) => void;
+      const promise = new Promise<T>((res, rej) => {
+        resolve = res;
+        reject = rej;
+      });
       return { promise, resolve, reject };
     };
     const firstStarted = createDeferred<void>();
diff --git a/src/plugin-sdk/keyed-async-queue.test.ts b/src/plugin-sdk/keyed-async-queue.test.ts
index 081225e840c..50038f5bc93 100644
--- a/src/plugin-sdk/keyed-async-queue.test.ts
+++ b/src/plugin-sdk/keyed-async-queue.test.ts
@@ -2,7 +2,12 @@ import { describe, expect, it, vi } from "vitest";
 import { enqueueKeyedTask, KeyedAsyncQueue } from "./keyed-async-queue.js";
 
 function deferred<T>() {
-  const { promise, resolve, reject } = Promise.withResolvers<T>();
+  let resolve!: (value: T | PromiseLike<T>) => void;
+  let reject!: (reason?: unknown) => void;
+  const promise = new Promise<T>((res, rej) => {
+    resolve = res;
+    reject = rej;
+  });
   return { promise, resolve, reject };
 }