diff --git a/docker-examples/v5/reverse_proxy/nginx/relative_path/nginx/Dockerfile b/docker-examples/v5/reverse_proxy/nginx/relative_path/nginx/Dockerfile
index 0b3d15e5dc23..2f9599ac6fde 100644
--- a/docker-examples/v5/reverse_proxy/nginx/relative_path/nginx/Dockerfile
+++ b/docker-examples/v5/reverse_proxy/nginx/relative_path/nginx/Dockerfile
@@ -1,2 +1,2 @@
-FROM nginx:mainline-alpine
+FROM nginx:1.21-alpine
 COPY nginx/default.conf /etc/nginx/conf.d/default.conf