diff --git a/.github/workflows/test-flakes.yml b/.github/workflows/test-flakes.yml
index 51f5c54..8b8d29f 100644
--- a/.github/workflows/test-flakes.yml
+++ b/.github/workflows/test-flakes.yml
@@ -17,7 +17,7 @@ jobs:
       with:
           # Nix Flakes doesn't work on shallow clones
           fetch-depth: 0
-    - uses: cachix/install-nix-action@v15
+    - uses: cachix/install-nix-action@v16
     - name: List flake structure
       run: nix flake show
     - name: Build
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 3cc8f03..ce115e5 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -14,6 +14,6 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2
-    - uses: cachix/install-nix-action@v15
+    - uses: cachix/install-nix-action@v16
     - name: build
       run: NIX_PATH=nixpkgs=https://github.com/NixOS/nixpkgs/archive/nixpkgs-unstable.tar.gz nix-build --expr '(import <nixpkgs> { }).callPackage ./. { }'