diff --git a/.github/workflows/build-iso.yml b/.github/workflows/build-iso.yml
index 1ee99e8..92c599f 100644
--- a/.github/workflows/build-iso.yml
+++ b/.github/workflows/build-iso.yml
@@ -33,7 +33,7 @@ jobs:
           ref: ${{ github.head_ref || github.ref_name }}
           token: ${{ secrets.GITHUB_TOKEN }}
 
-      - uses: cachix/install-nix-action@v27
+      - uses: cachix/install-nix-action@v31
         with:
           extra_nix_config: |
             experimental-features = nix-command flakes
@@ -65,7 +65,7 @@ jobs:
         with:
           ref: ${{ needs.lint.outputs.sha }}
 
-      - uses: cachix/install-nix-action@v27
+      - uses: cachix/install-nix-action@v31
         with:
           extra_nix_config: |
             experimental-features = nix-command flakes
@@ -93,7 +93,7 @@ jobs:
         with:
           ref: ${{ needs.lint.outputs.sha }}
 
-      - uses: cachix/install-nix-action@v27
+      - uses: cachix/install-nix-action@v31
         with:
           nix_path: nixpkgs=channel:nixos-24.11
           extra_nix_config: |
diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 77085b6..39d414b 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -14,7 +14,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: cachix/install-nix-action@v27
+      - uses: cachix/install-nix-action@v31
         with:
           extra_nix_config: |
             experimental-features = nix-command flakes