diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 0695acc..e4a8450 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -10,7 +10,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
-      - uses: cachix/install-nix-action@v20
+      - uses: cachix/install-nix-action@v21
         with:
           install_url: https://nixos.org/nix/install
           extra_nix_config: |
diff --git a/.github/workflows/fmt.yml b/.github/workflows/fmt.yml
index 3350047..12d1c63 100644
--- a/.github/workflows/fmt.yml
+++ b/.github/workflows/fmt.yml
@@ -10,7 +10,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
-      - uses: cachix/install-nix-action@v20
+      - uses: cachix/install-nix-action@v21
         with:
           install_url: https://nixos.org/nix/install
           extra_nix_config: |
diff --git a/.github/workflows/update.yml b/.github/workflows/update.yml
index 382a06c..44800ab 100644
--- a/.github/workflows/update.yml
+++ b/.github/workflows/update.yml
@@ -11,7 +11,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v2
       - name: Install Nix
-        uses: cachix/install-nix-action@v20
+        uses: cachix/install-nix-action@v21
         with:
           extra_nix_config: |
             auto-optimise-store = true