diff --git a/gen/openapi_server/__main__.py b/gen/openapi_server/__main__.py
index 2a1b759..3a500f7 100644
--- a/gen/openapi_server/__main__.py
+++ b/gen/openapi_server/__main__.py
@@ -24,7 +24,7 @@ app = connexion.FlaskApp(__name__, specification_dir='./openapi/')
 app.add_middleware(
     CORSMiddleware,
     position=MiddlewarePosition.BEFORE_EXCEPTION,
-    allow_origin_regex=r"^(https?://)(.*kanzleiapp\.io|.*masasana\.ai|localhost:4200)$",
+    allow_origin_regex=r"^https?://(.*\.kanzleiapp\.io|.*\.masasana\.ai|localhost:4200)$",
     allow_credentials=True,
     allow_methods=["*"],
     allow_headers=["*"],