diff --git a/modules/ssh/strong_password/Dockerfile b/modules/ssh/strong_password/Dockerfile
index d12986d9..041888f0 100644
--- a/modules/ssh/strong_password/Dockerfile
+++ b/modules/ssh/strong_password/Dockerfile
@@ -1,5 +1,5 @@
 # using phusion/baseimage as base image
-FROM ubuntu:latest
+FROM ubuntu:20.04
 
 # update and install openssh + python
 COPY files/requirements-apt-get.txt files/requirements-pip3.txt ./