diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 96d2678..0300d36 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -33,7 +33,7 @@ jobs:
     runs-on: ${{ matrix.config.host }}
     steps:
     - uses: actions/checkout@v3
-    - uses: cachix/install-nix-action@v19
+    - uses: cachix/install-nix-action@v21
       with:
         extra_nix_config: |
           access-tokens = github.com=${{ github.token }}
diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index f288f95..56a5972 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
-    - uses: cachix/install-nix-action@v19
+    - uses: cachix/install-nix-action@v21
       with:
         extra_nix_config: |
           access-tokens = github.com=${{ github.token }}
@@ -52,7 +52,7 @@ jobs:
     runs-on: ${{ matrix.config.host }}
     steps:
     - uses: actions/checkout@v3
-    - uses: cachix/install-nix-action@v19
+    - uses: cachix/install-nix-action@v21
       with:
         extra_nix_config: |
           access-tokens = github.com=${{ github.token }}