diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 9b9eff4..d999a61 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4.1.7
-      - uses: cachix/install-nix-action@V27
+      - uses: cachix/install-nix-action@v31
         with:
           nix_path: nixpkgs=channel:nixos-unstable
       - run: nix flake check
diff --git a/.github/workflows/update.yml b/.github/workflows/update.yml
index 4a47a62..3155b9d 100644
--- a/.github/workflows/update.yml
+++ b/.github/workflows/update.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4.1.7
-      - uses: cachix/install-nix-action@V27
+      - uses: cachix/install-nix-action@v31
         with:
           nix_path: nixpkgs=channel:nixos-unstable
       - run: ./update