diff --git a/.github/workflows/test-flakes.yml b/.github/workflows/test-flakes.yml
index d4da47a..028e080 100644
--- a/.github/workflows/test-flakes.yml
+++ b/.github/workflows/test-flakes.yml
@@ -14,7 +14,7 @@ jobs:
       with:
           # Nix Flakes doesn't work on shallow clones
           fetch-depth: 0
-    - uses: cachix/install-nix-action@v14
+    - uses: cachix/install-nix-action@v15
       with:
         extra_nix_config: |
           experimental-features = nix-command flakes
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 05ad242..eca315b 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2
-    - uses: cachix/install-nix-action@v14
+    - uses: cachix/install-nix-action@v15
       with:
         nix_path: "${{ matrix.nixPath }}"
         extra_nix_config: "system-features = nixos-test benchmark big-parallel kvm"