diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index aade500c..0327ff36 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@V28
+      - uses: cachix/install-nix-action@v29
         with:
           nix_path: nixpkgs=channel:nixos-unstable
       - name: Lint
@@ -28,7 +28,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@V28
+      - uses: cachix/install-nix-action@v29
         with:
           nix_path: nixpkgs=channel:nixos-unstable
       - name: Check documentation site builds
diff --git a/.github/workflows/deploy-documentation.yml b/.github/workflows/deploy-documentation.yml
index ccc54157..354a70a6 100644
--- a/.github/workflows/deploy-documentation.yml
+++ b/.github/workflows/deploy-documentation.yml
@@ -30,7 +30,7 @@ jobs:
       - name: Setup Pages
         uses: actions/configure-pages@v5
       - name: Install nix
-        uses: cachix/install-nix-action@V28
+        uses: cachix/install-nix-action@v29
         with:
           nix_path: nixpkgs=channel:nixos-unstable
       - name: Build