diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 6dd0cd8e..3d454b45 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -28,7 +28,7 @@ jobs:
             os: windows-latest
     name: Deploy ${{ matrix.target }}
     steps:
-    - uses: actions/checkout@master
+    - uses: actions/checkout@v4
     - name: Install Rust
       run: ci/install-rust.sh stable ${{ matrix.target }}
     - name: Build asset
@@ -41,7 +41,7 @@ jobs:
     name: GitHub Pages
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@master
+    - uses: actions/checkout@v4
     - name: Install Rust (rustup)
       run: rustup update stable --no-self-update && rustup default stable
     - name: Build book
@@ -58,7 +58,7 @@ jobs:
     name: Publish to crates.io
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v4
       - name: Install Rust (rustup)
         run: rustup update stable --no-self-update && rustup default stable
       - name: Publish
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index c2f622a5..a9b45702 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -44,7 +44,7 @@ jobs:
             target: x86_64-unknown-linux-gnu
     name: ${{ matrix.name }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Install Rust
       run: bash ci/install-rust.sh ${{ matrix.rust }} ${{ matrix.target }}
     - name: Build and run tests
@@ -55,7 +55,7 @@ jobs:
   aarch64-cross-builds:
     runs-on: ubuntu-20.04
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Install Rust
       run: bash ci/install-rust.sh stable aarch64-unknown-linux-musl
     - name: Build
@@ -65,7 +65,7 @@ jobs:
     name: Rustfmt
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Install Rust
       run: rustup update stable && rustup default stable && rustup component add rustfmt
     - run: cargo fmt --check