diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 3971599..d6a399f 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -15,7 +15,7 @@ jobs:
     name: Minimum supported rust version
     runs-on: ubuntu-20.04
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@master
       with:
         toolchain: stable minus 2 releases # MSRV policy = last three versions of stable
@@ -41,17 +41,17 @@ jobs:
     name: Documentation checks
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - run: RUSTDOCFLAGS='--deny warnings' cargo doc --no-deps --document-private-items --all-features
 
   bat-tests:
     name: Run bat syntax regression tests
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         path: 'syntect'
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         repository: 'sharkdp/bat'
         path: 'bat'
@@ -70,7 +70,7 @@ jobs:
     name: Build and test
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true
     - uses: dtolnay/rust-toolchain@stable