diff --git a/Dockerfile b/Dockerfile
index ff74928..2598782 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.20 AS build
+FROM alpine:3.21 AS build
 LABEL maintainer="Luke Tainton <luke@tainton.uk>"
 LABEL org.opencontainers.image.source="https://github.com/luketainton/docker-dnsmasq"