diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 02f65a3..64444dc 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -20,7 +20,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Install Nix
-        uses: cachix/install-nix-action@v26
+        uses: cachix/install-nix-action@v27
       - uses: cachix/cachix-action@v15
         with:
           name: nixpkgs-ruby
diff --git a/.github/workflows/update.yml b/.github/workflows/update.yml
index 4545069..71fecaa 100644
--- a/.github/workflows/update.yml
+++ b/.github/workflows/update.yml
@@ -16,7 +16,7 @@ jobs:
       with:
           ref: master
     - name: Install Nix
-      uses: cachix/install-nix-action@v26
+      uses: cachix/install-nix-action@v27
     - run: nix run .#update
       env:
         GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}