diff --git a/flake-registry.json b/flake-registry.json
index 8101ee3..0b50f76 100644
--- a/flake-registry.json
+++ b/flake-registry.json
@@ -119,6 +119,7 @@
       },
       "to": {
         "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
         "repo": "nixpkgs",
         "type": "github"
       }