diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 29c983c..9b88d8c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -23,7 +23,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v7
-      - uses: cachix/install-nix-action@91f6a0f59e94dfb2cfed0f4000f36a68ead1d20c # v31
+      - uses: cachix/install-nix-action@3dc140bfc76c49fbd4dd958429132e3746bcb086 # v31
       - uses: cachix/cachix-action@v17
         with:
           name: nixpkgs-python
diff --git a/.github/workflows/update.yml b/.github/workflows/update.yml
index 4d6255d..2b033f0 100644
--- a/.github/workflows/update.yml
+++ b/.github/workflows/update.yml
@@ -23,7 +23,7 @@ jobs:
           persist-credentials: false
 
       - name: Install Nix
-        uses: cachix/install-nix-action@91f6a0f59e94dfb2cfed0f4000f36a68ead1d20c # v31
+        uses: cachix/install-nix-action@3dc140bfc76c49fbd4dd958429132e3746bcb086 # v31
 
       - name: Install Cachix
         uses: cachix/cachix-action@v17