diff --git a/.hydra/spec.json b/.hydra/spec.json
index 79f9f0b..c3f7ee7 100644
--- a/.hydra/spec.json
+++ b/.hydra/spec.json
@@ -17,7 +17,7 @@
       "emailresponsible": false
     },
     "nixpkgs": {
-      "value": "https://github.com/NixOS/nixpkgs 0f920b05cbcdb8c0f3c5c4a8ea29f1f0065c7033 ",
+      "value": "https://github.com/NixOS/nixpkgs nixos-unstable-small",
       "type": "git",
       "emailresponsible": false
     },