diff --git a/.github/workflows/flake-update.yml b/.github/workflows/flake-update.yml
index baca2dc..53ee15a 100644
--- a/.github/workflows/flake-update.yml
+++ b/.github/workflows/flake-update.yml
@@ -11,7 +11,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4.1.1
       - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@v8
+        uses: DeterminateSystems/nix-installer-action@v9
       - name: update
         uses: DeterminateSystems/update-flake-lock@v20
         with: