diff --git a/pkgs/development/python-modules/typer/default.nix b/pkgs/development/python-modules/typer/default.nix
index 6aa663b0cc20..9ef2b53b9470 100644
--- a/pkgs/development/python-modules/typer/default.nix
+++ b/pkgs/development/python-modules/typer/default.nix
@@ -10,9 +10,6 @@
 , pytest-xdist
 , pytest-sugar
 , coverage
-, mypy
-, black
-, isort
 , pythonOlder
 }:
 
@@ -41,10 +38,7 @@ buildPythonPackage rec {
     pytest-xdist
     pytest-sugar
     shellingham
-    coverage
-    mypy
-    black
-    isort
+    coverage # execs coverage in tests
   ];
 
   preCheck = ''