diff --git a/docker/Dockerfile.linux.arm64 b/docker/Dockerfile.linux.arm64
index bf18557..6fecefa 100644
--- a/docker/Dockerfile.linux.arm64
+++ b/docker/Dockerfile.linux.arm64
@@ -1,4 +1,4 @@
-FROM arm64v8/alpine:3.19@sha256:a0264d60f80df12bc1e6dd98bae6c43debe6667c0ba482711f0d806493467a46
+FROM arm64v8/alpine:3.21@sha256:1a3d9599c6473f7a48fa21d7e1651960021a9affd2ae26c36541f85d65189e1f
 RUN apk add --no-cache ca-certificates mailcap && \
 	echo "@testing http://nl.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories