diff --git a/lib/Gateway.ts b/lib/Gateway.ts
index 64b7ce6..82f49b0 100644
--- a/lib/Gateway.ts
+++ b/lib/Gateway.ts
@@ -179,7 +179,7 @@ class GatewayClass {
   public async authenticate (
     req: IncomingMessage,
     res: ServerResponse
-  ): Promise<unknown> {
+  ): Promise<boolean> {
     logger ('trying to authenticate http request');
     if (this.try_access (req)) {
       logger ('authenticated via access_token');
diff --git a/package.json b/package.json
index 40b77de..741a7f1 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@sapphirecode/auth-server-helper",
-  "version": "2.2.4",
+  "version": "2.2.5",
   "main": "dist/index.js",
   "author": {
     "name": "Timo Hocker",