diff --git a/nginx/nginx/Dockerfile b/nginx/nginx/Dockerfile
index 2f040c3..19a359b 100644
--- a/nginx/nginx/Dockerfile
+++ b/nginx/nginx/Dockerfile
@@ -1,4 +1,4 @@
-FROM nginx:1.21.0-alpine
+FROM nginx:1.20.0-alpine
 
 COPY entrypoint.sh /entrypoint.sh
 COPY renew /etc/periodic/weekly/renew