diff --git a/default.nix b/default.nix
index 7c536a03..7cd89d90 100644
--- a/default.nix
+++ b/default.nix
@@ -55,6 +55,7 @@ in
         };
       in
       [
+        pkgs.npins
         pkgs.nix-unit
         test-loop
       ];