diff --git a/pyproject.toml b/pyproject.toml
index 89e7fff..de36a91 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,9 +16,10 @@ classifiers = [
   "Operating System :: OS Independent",
 ]
 dependencies = [
-  "openg2p-fastapi-common",
-  "openg2p-g2pconnect-common-lib",
-  "openg2p-g2pconnect-mapper-lib",
+    "openg2p-fastapi-common",
+    "openg2p-g2pconnect-common-lib",
+    "openg2p-g2pconnect-mapper-lib",
+    "gunicorn ~=22.0.0",
 ]
 dynamic = ["version"]