diff --git a/README.md b/README.md
index ab0822f..1a2a562 100644
--- a/README.md
+++ b/README.md
@@ -41,7 +41,8 @@ If you don't want to or can't build the image, you can find downloads under <rel
 
 ## Dependencies
 
-Building PrawnOS has been tested on Debian 9 Stretch (in a VM)
+Building PrawnOS has been tested on Debian 10 Buster (in a VM)
+_stretch doesn't work as the version of gcc-arm-none-eabi is too old_
 This is the only build enviroment that is supported. 
 These packages are required: