diff --git a/.github/workflows/nix.yml b/.github/workflows/nix.yml
index f770986f6..e84573ff0 100644
--- a/.github/workflows/nix.yml
+++ b/.github/workflows/nix.yml
@@ -13,7 +13,7 @@ jobs:
   #       with:
   #         submodules: true
   #     - name: nix
-  #       uses: cachix/install-nix-action@v30
+  #       uses: cachix/install-nix-action@v31
   #       with:
   #         nix_path: nixpkgs=channel:nixos-unstable
   #     - run: nix develop .#check -c make nix-tests
@@ -25,7 +25,7 @@ jobs:
         with:
           submodules: true
       - name: nix
-        uses: cachix/install-nix-action@v30
+        uses: cachix/install-nix-action@v31
         with:
           nix_path: nixpkgs=channel:nixos-unstable
       - run: nix develop .#fmt -c make nix-fmt
diff --git a/.github/workflows/update-flake-lock.yml b/.github/workflows/update-flake-lock.yml
index f62bcd9fa..0c8313a2d 100644
--- a/.github/workflows/update-flake-lock.yml
+++ b/.github/workflows/update-flake-lock.yml
@@ -11,7 +11,7 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v30
+      - uses: cachix/install-nix-action@v31
         with:
           nix_path: nixpkgs=channel:nixos-unstable
       - uses: DeterminateSystems/update-flake-lock@v24