diff --git a/daemon/Dockerfile b/daemon/Dockerfile
index 1d808831..d03d7e0f 100644
--- a/daemon/Dockerfile
+++ b/daemon/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.6-slim-stretch
+FROM python:3.6.12-slim-buster
 
 
 LABEL authors="Patrick Jentsch <p.jentsch@uni-bielefeld.de>, Stephan Porada <sporada@uni-bielefeld.de>"
diff --git a/web/Dockerfile b/web/Dockerfile
index dc4e149c..c467b259 100644
--- a/web/Dockerfile
+++ b/web/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.6-slim-stretch
+FROM python:3.6.12-slim-buster
 
 
 LABEL authors="Patrick Jentsch <p.jentsch@uni-bielefeld.de>, Stephan Porada <sporada@uni-bielefeld.de>"