diff --git a/Dockerfile.ubuntu b/Dockerfile.ubuntu
index 59c3593f6d8446d16715553d409a76e6add92e2b..ee7d93bcd179b43974adf3b33a0538a194b16b75 100644
--- a/Dockerfile.ubuntu
+++ b/Dockerfile.ubuntu
@@ -1,7 +1,7 @@
-FROM ubuntu
+FROM ubuntu:bionic
 LABEL maintainer="Jens Heidbüchel <j.heidbuechel@fz-juelich.de>"
 
-ENV REFRESHED_AT 2019-05-22
+ENV REFRESHED_AT 2020-06-09
 ENV DEBIAN_FRONTEND noninteractive
 
 RUN apt-get update && \