diff --git a/README.md b/README.md
index 47d19df..d5609db 100644
--- a/README.md
+++ b/README.md
@@ -33,7 +33,7 @@ jobs:
   tests:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: cachix/install-nix-action@v27
       with:
         nix_path: nixpkgs=channel:nixos-unstable