diff --git a/Dockerfile b/Dockerfile
index 44306a56..8a2148c9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,7 @@ ARG RENOVATE_VERSION=39.20.1
 
 # Base image
 #============
-FROM ghcr.io/containerbase/base:13.0.20@sha256:50ec77fcca858e7a706e99ea64185fb357505e3614fed09c68b3c347bbeba7f5 AS base
+FROM ghcr.io/containerbase/base:13.0.21@sha256:8cec719c080fca375692439d7ac459a18fba433f65a0346edbaaec5bc50e1c0f AS base
 
 LABEL maintainer="Michael Kriese <michael.kriese@visualon.de>"
 LABEL name="renovate"