diff --git a/mkosi.conf.d/05-tools/mkosi.conf b/mkosi.conf.d/05-tools/mkosi.conf
index 6da7766dc13..8ac2ebe24d6 100644
--- a/mkosi.conf.d/05-tools/mkosi.conf
+++ b/mkosi.conf.d/05-tools/mkosi.conf
@@ -2,7 +2,9 @@
 
 [Build]
 ToolsTreePackages=
-        meson
         gcc
         gperf
+        meson
+        mypy
         pkgconf
+        ruff