diff --git a/2.4/alpine/Dockerfile b/2.4/alpine/Dockerfile
index f31e744..f793cbf 100644
--- a/2.4/alpine/Dockerfile
+++ b/2.4/alpine/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.20
+FROM alpine:3.21
 
 # ensure www-data user exists
 RUN set -x \