diff --git a/.github/workflows/update-ghc.yaml b/.github/workflows/update-ghc.yaml
index a70d9ce20..001cb8d86 100644
--- a/.github/workflows/update-ghc.yaml
+++ b/.github/workflows/update-ghc.yaml
@@ -22,7 +22,7 @@ jobs:
       - uses: actions/checkout@v4
         with:
           ref: master
-      - uses: cachix/install-nix-action@V28
+      - uses: cachix/install-nix-action@v29
         with:
           nix_path: nixpkgs=nixpkgs/default.nix
       - name: Fetch updates
diff --git a/.github/workflows/workflow.yaml b/.github/workflows/workflow.yaml
index 3b0d4a2e7..dc7b07b34 100644
--- a/.github/workflows/workflow.yaml
+++ b/.github/workflows/workflow.yaml
@@ -71,7 +71,7 @@ jobs:
         with:
           path: ~/repo-cache
           key: repo-cache-${{ runner.os }}-nixpkgs-${{ env.cache-version }}
-      - uses: cachix/install-nix-action@V28
+      - uses: cachix/install-nix-action@v29
         with:
           nix_path: nixpkgs=./nixpkgs/default.nix
           extra_nix_config: |