diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index faefac8..a903001 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@ab739621df7a23f52766f9ccc97f38da6b7af14f # v31
+      - uses: cachix/install-nix-action@8aa03977d8d733052d78f4e008a241fd1dbf36b3 # v31
       - uses: cachix/cachix-action@v17
         with:
           name: nixpkgs-python
diff --git a/.github/workflows/update.yml b/.github/workflows/update.yml
index 1858273..354e109 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@ab739621df7a23f52766f9ccc97f38da6b7af14f # v31
+        uses: cachix/install-nix-action@8aa03977d8d733052d78f4e008a241fd1dbf36b3 # v31
 
       - name: Install Cachix
         uses: cachix/cachix-action@v17