diff --git a/Dockerfile.m4 b/Dockerfile.m4
index c3ac80b..125a1a7 100644
--- a/Dockerfile.m4
+++ b/Dockerfile.m4
@@ -237,7 +237,7 @@ EOF
 ## "main" stage
 ##################################################
 
-m4_ifdef([[CROSS_ARCH]], [[FROM docker.io/CROSS_ARCH/ubuntu:24.04]], [[FROM docker.io/ubuntu:24.04]]) AS main
+m4_ifdef([[CROSS_ARCH]], [[FROM dtcooper/raspberrypi-os:latest]], [[FROM dtcooper/raspberrypi-os:latest]]) AS main
 
 SHELL ["/bin/sh", "-euc"]