diff --git a/gen/openapi_server/__main__.py b/gen/openapi_server/__main__.py
index 73a26bd..cc220b0 100644
--- a/gen/openapi_server/__main__.py
+++ b/gen/openapi_server/__main__.py
@@ -11,9 +11,8 @@ from starlette.middleware.cors import CORSMiddleware
 import re
 
 
-kanzleiapp_urls = "[a-zA-Z0-9.-]+\.kanzleiapp\.io"
-masasana_urls = r"[a-zA-Z0-9.-]+\.masasana\.ai"
-
+kanzleiapp_urls = r"^https://[a-zA-Z0-9.-]+\.kanzleiapp\.io$"
+masasana_urls = r"^https://[a-zA-Z0-9.-]+\.masasana\.ai$"
 client = MongoClient(host='mongodb://admin:admin@announcement-service-database-svc:27017/?authSource=admin')
 db = client["MainDB"]
 collection = db['patch_notes']
@@ -23,7 +22,10 @@ app = connexion.FlaskApp(__name__, specification_dir='./openapi/')
 app.add_middleware(
     CORSMiddleware,
     position=MiddlewarePosition.BEFORE_EXCEPTION,
-    allow_origins=["http://localhost:4200", kanzleiapp_urls, masasana_urls],
+    allow_origins_regex=[
+        kanzleiapp_urls,
+        masasana_urls,
+    ],    allow_origins=["http://localhost:4200"],
     allow_credentials=True,
     allow_methods=["*"],
     allow_headers=["*"],