diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d371912..d96b109 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -26,7 +26,7 @@ jobs:
 
       - name: nix · setup
         if: matrix.os != 'windows-latest'
-        uses: cachix/install-nix-action@v21
+        uses: cachix/install-nix-action@v23
       - run: nix build
         name: nix · test and build the project
         if: matrix.os != 'windows-latest'
diff --git a/.github/workflows/upgrade-flakes.yml b/.github/workflows/upgrade-flakes.yml
index 51b4230..408b86e 100644
--- a/.github/workflows/upgrade-flakes.yml
+++ b/.github/workflows/upgrade-flakes.yml
@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - uses: cachix/install-nix-action@v21
+      - uses: cachix/install-nix-action@v23
         with:
           install_url: https://github.com/numtide/nix-flakes-installer/releases/download/nix-2.4pre20210415_76980a1/install
           extra_nix_config: |