diff --git a/cross-m68k-atarist-mint/Dockerfile b/cross-m68k-atarist-mint/Dockerfile
index 0087427..90bd6d9 100644
--- a/cross-m68k-atarist-mint/Dockerfile
+++ b/cross-m68k-atarist-mint/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:latest
+FROM ubuntu:20.04
 
 LABEL maintainer="claunia@claunia.com"