diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 05a5779..faefac8 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -24,7 +24,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v6
-      - uses: cachix/install-nix-action@616559265b40713947b9c190a8ff4b507b5df49b # v31
+      - uses: cachix/install-nix-action@ab739621df7a23f52766f9ccc97f38da6b7af14f # v31
       - uses: cachix/cachix-action@v17
         with:
           name: nixpkgs-python
diff --git a/.github/workflows/update.yml b/.github/workflows/update.yml
index 5d741eb..1858273 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@616559265b40713947b9c190a8ff4b507b5df49b # v31
+        uses: cachix/install-nix-action@ab739621df7a23f52766f9ccc97f38da6b7af14f # v31
 
       - name: Install Cachix
         uses: cachix/cachix-action@v17