diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 158dd70..09e2253
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
 Flask==1.0.3
-gunicorn==19.9.0
+gunicorn==21.2.0
 python-json-logger==0.1.11