diff --git a/README.md b/README.md
index 9cac7ad..572cd9e 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # script collection for certbot dns authentification for domains hosted by inwx.de
 
 This script collection is in alpha state and only useable on linux systems.
-Tested with debian 9 and ubuntu 16.04.
+Tested with debian 10 and ubuntu 20.04.
 
 
 ## requirements