diff --git a/README.md b/README.md
index b9466fc..90fc9df 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,14 @@ License Version 2.0.
 
 Copyright © 2020, 2021, 2022  Jan Dittberner
 
+The setup and configuration has been tested on Debian testing on 2022-08-09
+using the following versions software versions:
+
+- mkcert v1.4.4
+- openssl 3.0.4
+- PostgreSQL 14.4
+- ORY Hydra v1.11.9
+
 ## Setup
 
 ### Certificates