diff --git a/Dockerfile b/Dockerfile
index 50b8ea5..59d1d77 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM nginx:1.21.4
+FROM nginx:1.21.6
 # TODO: use renovate-bot to send pull requests on upstream image updates
 
 RUN mkdir /etc/nginx/templates.override