diff --git a/Dockerfile b/Dockerfile
index d339530..e92d269 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -15,7 +15,7 @@ ARG DUMP_TORRENT_VERSION=302ac444a20442edb4aeabef65b264a85ab88ce9
 # v6.3-0.9.8-0.13.8
 ARG RTORRENT_STICKZ_VERSION=ddbbe8a03fb94cf95ab9a6d7fd5c60e51c0353ba
 
-ARG ALPINE_VERSION=3.20
+ARG ALPINE_VERSION=3.21
 ARG ALPINE_S6_VERSION=${ALPINE_VERSION}-2.2.0.3
 
 FROM --platform=${BUILDPLATFORM} alpine:${ALPINE_VERSION} AS src