diff --git a/cross-arm-riscos/Dockerfile b/cross-arm-riscos/Dockerfile
index 0a32cfa..3b936f5 100644
--- a/cross-arm-riscos/Dockerfile
+++ b/cross-arm-riscos/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:latest
+FROM ubuntu:20.04
 
 LABEL maintainer="claunia@claunia.com"