diff --git a/pkgs/development/python-modules/tatsu/default.nix b/pkgs/development/python-modules/tatsu/default.nix
index 26f58e415445..789e054dbb06 100644
--- a/pkgs/development/python-modules/tatsu/default.nix
+++ b/pkgs/development/python-modules/tatsu/default.nix
@@ -7,7 +7,7 @@ buildPythonPackage rec {
   pname = "tatsu";
   version = "5.7.1";
   # upstream only supports 3.10+
-  disabled = pythonOlder "3.9";
+  disabled = pythonOlder "3.10";
 
   src = fetchFromGitHub {
     owner = "neogeny";