diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0a5cc38..c9e5fee 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -41,7 +41,7 @@ jobs:
       contents: read
       id-token: write
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Nix
         uses: ./
         with:
@@ -123,7 +123,7 @@ jobs:
       contents: read
       id-token: write
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Nix
         uses: ./
         with:
diff --git a/README.md b/README.md
index 30ae5e7..b7fd076 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@ jobs:
     name: Build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: DeterminateSystems/nix-installer-action@main
       - run: nix build .
 ```
@@ -50,7 +50,7 @@ jobs:
       id-token: "write"
       contents: "read"
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: DeterminateSystems/nix-installer-action@main
         with:
           flakehub: true