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"
   ];
diff --git a/pkgs/development/python-modules/harlequin-postgres/default.nix b/pkgs/development/python-modules/harlequin-postgres/default.nix
index bcc9f7c9a811..df86761b13a2 100644
--- a/pkgs/development/python-modules/harlequin-postgres/default.nix
+++ b/pkgs/development/python-modules/harlequin-postgres/default.nix
@@ -4,6 +4,8 @@
   fetchPypi,
   hatchling,
   psycopg,
+  duckdb,
+  pythonAtLeast,
 }:
 
 buildPythonPackage rec {
@@ -24,7 +26,8 @@ buildPythonPackage rec {
   dependencies = [
     psycopg
     psycopg.pool
-  ];
+  ]
+  ++ lib.optional (pythonAtLeast "3.14") duckdb;
 
   # To prevent circular dependency
   # as harlequin-postgres requires harlequin which requires harlequin-postgres