diff --git a/requirements/adapter.txt b/requirements/adapter.txt
index 473735e36..d35a5f2cf 100644
--- a/requirements/adapter.txt
+++ b/requirements/adapter.txt
@@ -18,5 +18,5 @@ sanic>=22,<24; python_version>"3.6"
 starlette>=0.14,<1
 tornado>=6,<7
 uvicorn<1                                # The oldest version can vary among Python runtime versions
-gunicorn>=20,<22
+gunicorn>=20,<23
 websocket_client>=1.2.3,<2               # Socket Mode 3rd party implementation