diff --git a/Dockerfile b/Dockerfile
index b1e6ec75947979e8384c0a413c0fda822d625e1f..7c30f2bc4f1f7ccc2e22992db2840305d61545c8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.9 as rootfs-stage
+FROM alpine:3.12 as rootfs-stage
 
 # environment
 ENV REL=bionic
diff --git a/Dockerfile.aarch64 b/Dockerfile.aarch64
index b58491c48db8a739edacc836d1a18be9e917ddcd..c88ddeb49437de629bd90bf4475e4552735d6203 100644
--- a/Dockerfile.aarch64
+++ b/Dockerfile.aarch64
@@ -1,4 +1,4 @@
-FROM alpine:3.9 as rootfs-stage
+FROM alpine:3.12 as rootfs-stage
 
 # environment
 ENV REL=bionic
diff --git a/Dockerfile.armhf b/Dockerfile.armhf
index 175c35e45fdfa30da7fa146f9148d8f9b743767b..b60381d0311b81630d9307acd34422b7eef23434 100644
--- a/Dockerfile.armhf
+++ b/Dockerfile.armhf
@@ -1,4 +1,4 @@
-FROM alpine:3.9 as rootfs-stage
+FROM alpine:3.12 as rootfs-stage
 
 # environment
 ENV REL=bionic