diff --git a/flake.nix b/flake.nix
index 349faa7..1d5a825 100644
--- a/flake.nix
+++ b/flake.nix
@@ -15,6 +15,7 @@
           requirements = base-requirements + ''
             autopep8
             flake8
+            black
             pytest
             pytest-cov
             pyinstaller