diff --git a/flake.nix b/flake.nix
index 165ccbb..40b92a3 100644
--- a/flake.nix
+++ b/flake.nix
@@ -21,7 +21,7 @@
     in
       with pkgs; {
         devShell = mkShell {
-          buildInputs = [nodejs yarn watchman alejandra nodePackages.prettier just protobuf];
+          buildInputs = [nodejs yarn watchman alejandra nodePackages.prettier just protobuf black];
         };
       });
 }