diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 35b9a0f..a7f2029 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - uses: cachix/install-nix-action@v20
+      - uses: cachix/install-nix-action@v21
         with:
           nix_path: nixpkgs=channel:nixos-unstable
       - run: nix-shell --run "black --check --diff ."
@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - uses: cachix/install-nix-action@v20
+      - uses: cachix/install-nix-action@v21
         with:
           nix_path: nixpkgs=channel:nixos-unstable
       - run: nix-shell --run "pylama packetnetworking setup.py"