diff --git a/Retro68/universal/all/Dockerfile b/Retro68/universal/all/Dockerfile
index 48ce211..f150435 100644
--- a/Retro68/universal/all/Dockerfile
+++ b/Retro68/universal/all/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:latest
+FROM ubuntu:20.04
 
 LABEL description="Retro68 cross compiler environment for m68k, PowerPC and Carbon development with the Apple Universal libraries."