diff --git a/.github/workflows/update.yml b/.github/workflows/update.yml
index 8b75701..26547b2 100644
--- a/.github/workflows/update.yml
+++ b/.github/workflows/update.yml
@@ -19,6 +19,8 @@ jobs:
         uses: actions/checkout@v3
       - name: Install Nix
         uses: DeterminateSystems/nix-installer-action@v11
+        with:
+          nix-package-url: https://releases.nixos.org/nix/nix-2.18.4/nix-2.18.4-x86_64-linux.tar.xz
       - name: Check Nixpkgs Inputs
         uses: DeterminateSystems/flake-checker-action@v7
       - name: Add Nix Cache