diff --git a/Retro68/universal/ppc-carbon/Dockerfile b/Retro68/universal/ppc-carbon/Dockerfile
index 1d31fb1..0b74eac 100644
--- a/Retro68/universal/ppc-carbon/Dockerfile
+++ b/Retro68/universal/ppc-carbon/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:latest
+FROM ubuntu:20.04
 
 LABEL description="	Retro68 cross compiler environment with cmake alias for PowerPC and Carbon development with the Apple Universal libraries."