diff --git a/docker/Dockerfile.linux.arm64 b/docker/Dockerfile.linux.arm64
index bf18557..2156ae0 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@sha256:7a04ffc3dd9fae02928205d3fb9414decdee461f62fc2b56df7f4da063ec6bdf
 RUN apk add --no-cache ca-certificates mailcap && \
 	echo "@testing http://nl.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories