diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 91eb216..9f78238 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,7 +18,7 @@ jobs:
     runs-on: "${{ matrix.os }}"
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v25
+      - uses: cachix/install-nix-action@V27
       - uses: cachix/cachix-action@v15
         with:
           name: nix-script
@@ -33,7 +33,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v25
+      - uses: cachix/install-nix-action@V27
       - uses: cachix/cachix-action@v15
         with:
           name: nix-script
diff --git a/.github/workflows/update_nix.yml b/.github/workflows/update_nix.yml
index 14ec5d7..d7f78d9 100644
--- a/.github/workflows/update_nix.yml
+++ b/.github/workflows/update_nix.yml
@@ -14,7 +14,7 @@ jobs:
         with:
           ref: main
           ssh-key: ${{ secrets.UPDATE_SSH_KEY }}
-      - uses: cachix/install-nix-action@v25
+      - uses: cachix/install-nix-action@V27
       - run: nix flake update
       - name: Create PR
         env: