diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index dafe86b..c7205cf 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -11,7 +11,7 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v3
     - name: Install nixFlake
-      uses: cachix/install-nix-action@v20
+      uses: cachix/install-nix-action@v29
       with:
         install_url: https://github.com/numtide/nix-unstable-installer/releases/latest/download/install
         extra_nix_config: |
diff --git a/.github/workflows/update.yml b/.github/workflows/update.yml
index bae023b..a9b2670 100644
--- a/.github/workflows/update.yml
+++ b/.github/workflows/update.yml
@@ -17,7 +17,7 @@ jobs:
         # Nix Flakes doesn't work on shallow clones
         fetch-depth: 0
     - name: Install nixFlake
-      uses: cachix/install-nix-action@v20
+      uses: cachix/install-nix-action@v29
       with:
         install_url: https://github.com/numtide/nix-unstable-installer/releases/latest/download/install
         extra_nix_config: |