diff --git a/default.nix b/default.nix
index a6e2c7d..6d1e106 100644
--- a/default.nix
+++ b/default.nix
@@ -1,7 +1,4 @@
 {
-  pkgs ?
-    import
-      (fetchTarball "https://github.com/NixOS/nixpkgs/archive/c6d65881c5624c9cae5ea6cedef24699b0c0a4c0.tar.gz")
-      { },
+  pkgs ? import <nixpkgs> { },
 }:
 pkgs.callPackage ./package.nix { }
diff --git a/update-npm-hash.sh b/update-npm-hash.sh
new file mode 100755
index 0000000..8044cf8
--- /dev/null
+++ b/update-npm-hash.sh
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+hash=$(nix-shell -p prefetch-npm-deps --run "prefetch-npm-deps package-lock.json" 2>/dev/null)
+echo "New hash: $hash"
+sed -i "s|hash = \"[^\"]*\"|hash = \"$hash\"|" package.nix
\ No newline at end of file