diff --git a/docker-examples/v5/reverse_proxy/nginx_relative/nginx/Dockerfile b/docker-examples/v5/reverse_proxy/nginx_relative/nginx/Dockerfile
old mode 100755
new mode 100644
index 71edc0215c9a..2f9599ac6fde
--- a/docker-examples/v5/reverse_proxy/nginx_relative/nginx/Dockerfile
+++ b/docker-examples/v5/reverse_proxy/nginx_relative/nginx/Dockerfile
@@ -1,2 +1,2 @@
-FROM nginx:1.14.2-alpine
+FROM nginx:1.21-alpine
 COPY nginx/default.conf /etc/nginx/conf.d/default.conf