diff --git a/Dockerfile b/Dockerfile
index 36ea6dd..772aa44 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:latest
+FROM alpine:3.21
 LABEL Maintainer="Christian Steinle <kontakt@steinle-computer.de>"
 LABEL Description="Lightweight container with Nginx 1.22 & PHP 8.2 based on Alpine Linux."