diff --git a/pkgs/by-name/ha/harlequin/package.nix b/pkgs/by-name/ha/harlequin/package.nix
index 21d8ab2bd7eb..a5ea97b1a59a 100644
--- a/pkgs/by-name/ha/harlequin/package.nix
+++ b/pkgs/by-name/ha/harlequin/package.nix
@@ -29,6 +29,7 @@ python3Packages.buildPythonApplication (finalAttrs: {
     "questionary"
     "rich-click"
     "textual"
+    "tomlkit"
     "tree-sitter"
     "tree-sitter-sql"
   ];