diff --git a/nix/neovim-overlay.nix b/nix/neovim-overlay.nix
index 3374c5a..72bb006 100644
--- a/nix/neovim-overlay.nix
+++ b/nix/neovim-overlay.nix
@@ -49,6 +49,7 @@ with final.pkgs.lib; let
     puppet-lint
     yamllint
     jq
+    alejandra
 
     # LSPs
     gopls