diff --git a/logical-backup/Dockerfile b/logical-backup/Dockerfile
index a360bdf3e..137f4efa8 100644
--- a/logical-backup/Dockerfile
+++ b/logical-backup/Dockerfile
@@ -1,4 +1,4 @@
-ARG BASE_IMAGE=ghcr.io/ubuntu/ubuntu-22.04:latest
+ARG BASE_IMAGE=registry.opensource.zalan.do/library/ubuntu-22.04:latest
 FROM ${BASE_IMAGE}
 LABEL maintainer="Team ACID @ Zalando <team-acid@zalando.de>"
 
diff --git a/ui/Dockerfile b/ui/Dockerfile
index 1636c56f1..a32b9c80d 100644
--- a/ui/Dockerfile
+++ b/ui/Dockerfile
@@ -1,4 +1,4 @@
-ARG BASE_IMAGE=ghcr.io/python/python-3.11-slim:latest
+ARG BASE_IMAGE=registry.opensource.zalan.do/library/python-3.11-slim:latest
 ARG NODE_IMAGE=node:lts-alpine
 
 FROM $NODE_IMAGE AS build