diff --git a/Dockerfile b/Dockerfile
index bbdf1f6..a24757c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,10 +1,10 @@
 # syntax=docker/dockerfile:1
 
-FROM alpine:3.22 AS rootfs-stage
+FROM alpine:3.21 AS rootfs-stage
 
 ARG S6_OVERLAY_VERSION="3.2.2.0"
 ARG ROOTFS=/root-out
-ARG REL=v3.22
+ARG REL=v3.21
 ARG ARCH=x86_64
 ARG MIRROR=http://dl-cdn.alpinelinux.org/alpine
 ARG PACKAGES=alpine-baselayout,\
diff --git a/Dockerfile.aarch64 b/Dockerfile.aarch64
index 416f401..a819d1e 100644
--- a/Dockerfile.aarch64
+++ b/Dockerfile.aarch64
@@ -1,10 +1,10 @@
 # syntax=docker/dockerfile:1
 
-FROM alpine:3.22 AS rootfs-stage
+FROM alpine:3.21 AS rootfs-stage
 
 ARG S6_OVERLAY_VERSION="3.2.2.0"
 ARG ROOTFS=/root-out
-ARG REL=v3.22
+ARG REL=v3.21
 ARG ARCH=aarch64
 ARG MIRROR=http://dl-cdn.alpinelinux.org/alpine
 ARG PACKAGES=alpine-baselayout,\