diff --git a/__tests__/plugins/jobLock.ts b/__tests__/plugins/jobLock.ts
index c4bc0010..535ec475 100644
--- a/__tests__/plugins/jobLock.ts
+++ b/__tests__/plugins/jobLock.ts
@@ -91,7 +91,7 @@ describe("plugins", () => {
             worker1.end();
             worker2.end();
             expect(new Date().getTime() - startTime).toBeLessThan(jobDelay * 3);
-            resolve();
+            resolve(null);
           }
         };
 
diff --git a/package.json b/package.json
index 847f941a..61efe012 100644
--- a/package.json
+++ b/package.json
@@ -29,17 +29,17 @@
     "ioredis": "^4.19.2"
   },
   "devDependencies": {
-    "@types/ioredis": "^4.17.7",
-    "@types/jest": "^26.0.15",
-    "@types/node": "^14.14.6",
-    "ioredis-mock": "^5.1.0",
+    "@types/ioredis": "^4.17.8",
+    "@types/jest": "^26.0.16",
+    "@types/node": "^14.14.10",
+    "ioredis-mock": "^5.2.0",
     "jest": "^26.6.3",
     "node-schedule": "^1.3.2",
-    "prettier": "^2.1.2",
-    "ts-jest": "^26.4.3",
-    "ts-node": "^9.0.0",
+    "prettier": "^2.2.1",
+    "ts-jest": "^26.4.4",
+    "ts-node": "^9.1.0",
     "typedoc": "^0.19.2",
-    "typescript": "^4.0.5"
+    "typescript": "^4.1.2"
   },
   "jest": {
     "testPathIgnorePatterns": [
diff --git a/src/core/multiWorker.ts b/src/core/multiWorker.ts
index 7230825e..c4ad1d37 100644
--- a/src/core/multiWorker.ts
+++ b/src/core/multiWorker.ts
@@ -253,7 +253,7 @@ export class MultiWorker extends EventEmitter {
           new Promise(async (resolve) => {
             await worker.end();
             await this.cleanupWorker(worker);
-            return resolve();
+            return resolve(null);
           })
         );
       });
diff --git a/src/core/scheduler.ts b/src/core/scheduler.ts
index 7808d2fc..29e8243c 100644
--- a/src/core/scheduler.ts
+++ b/src/core/scheduler.ts
@@ -129,7 +129,7 @@ export class Scheduler extends EventEmitter {
       return new Promise((resolve) => {
         setTimeout(async () => {
           await this.end();
-          resolve();
+          resolve(null);
         }, this.options.timeout / 2);
       });
     }
diff --git a/src/core/worker.ts b/src/core/worker.ts
index 1a120c89..dfb1ea46 100644
--- a/src/core/worker.ts
+++ b/src/core/worker.ts
@@ -169,7 +169,7 @@ export class Worker extends EventEmitter {
     if (this.working === true) {
       await new Promise((resolve) => {
         setTimeout(() => {
-          resolve();
+          resolve(null);
         }, this.options.timeout);
       });
       return this.end();
@@ -407,7 +407,7 @@ export class Worker extends EventEmitter {
     await new Promise((resolve) => {
       setTimeout(() => {
         this.poll();
-        resolve();
+        resolve(null);
       }, this.options.timeout);
     });
   }