diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fa3266b..0aa1d19 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,6 +15,6 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v5
       - name: Install nix
-        uses: DeterminateSystems/nix-installer-action@v20
+        uses: DeterminateSystems/nix-installer-action@v21
       - name: Run check
         run: "nix -L flake check"