diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index eec8388..517ab15
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ Flask==2.0.3
 Werkzeug==2.2.2
 
 # Application server for both development and production.
-gunicorn==19.9.0
+gunicorn==22.0.0
 
 # Testing and static analysis.
 pytest==2.9.1