diff --git a/package-lock.json b/package-lock.json
index ef6b0326..91b54f99 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "pg-boss",
-  "version": "9.0.0",
+  "version": "9.0.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "pg-boss",
-      "version": "9.0.0",
+      "version": "9.0.1",
       "license": "MIT",
       "dependencies": {
         "cron-parser": "^4.0.0",
diff --git a/package.json b/package.json
index 688da767..07fbcdc4 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "pg-boss",
-  "version": "9.0.0",
+  "version": "9.0.1",
   "description": "Queueing jobs in Node.js using PostgreSQL like a boss",
   "main": "./src/index.js",
   "engines": {
diff --git a/types.d.ts b/types.d.ts
index e167e763..703cd5e2 100644
--- a/types.d.ts
+++ b/types.d.ts
@@ -124,11 +124,11 @@ declare namespace PgBoss {
   } & ConnectionOptions;
 
   interface WorkHandler<ReqData> {
-    (job: PgBoss.Job<ReqData>): void;
+    (job: PgBoss.Job<ReqData>): Promise<void>;
   }
 
   interface WorkWithMetadataHandler<ReqData> {
-    (job: PgBoss.JobWithMetadata<ReqData>): void;
+    (job: PgBoss.JobWithMetadata<ReqData>): Promise<void>;
   }
 
   interface Request {