diff --git a/Dockerfile b/Dockerfile
index 15ba8c2..39392dc 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,7 +6,7 @@ ARG DISTRO=focal
 #--------------------------------------
 # base images
 #--------------------------------------
-FROM ghcr.io/containerbase/ubuntu:20.04@sha256:6d8d9799fe6ab3221965efac00b4c34a2bcc102c086a58dff9e19a08b913c7ef AS build-focal
+FROM ghcr.io/containerbase/ubuntu:20.04@sha256:370f2c01c3036a6134acf3bcff01c210acfc9d2d2573cab46af4f02243231a6a AS build-focal
 FROM ghcr.io/containerbase/ubuntu:22.04@sha256:58b87898e82351c6cf9cf5b9f3c20257bb9e2dcf33af051e12ce532d7f94e3fe AS build-jammy