diff --git a/Dockerfile b/Dockerfile
index 0752b71..643a270 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:21.04
+FROM ubuntu:20.10
 LABEL maintainer="Frank Denis"
 SHELL ["/bin/sh", "-x", "-c"]
 ENV SERIAL 2