diff --git a/default.nix b/default.nix
index f419536..8187c0a 100644
--- a/default.nix
+++ b/default.nix
@@ -3,7 +3,7 @@
 , pyproject-nix
 , lib
 , fetchurl
-, python38
+, python39
 , newScope
 , openocd
 , autoreconfHook