diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 3537250..8f97784 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -22,7 +22,7 @@ jobs:
   pre-commit:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: actions/setup-python@v4
       with:
         python-version: "3.9"
@@ -41,7 +41,7 @@ jobs:
         - '3.12'
         - 'pypy3.9'
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: install rust stable
         uses: dtolnay/rust-toolchain@stable
       - name: cache rust
@@ -71,7 +71,7 @@ jobs:
         - s390x  # TODO build fails: "error: failed to run custom build command for `psm v0.1.21`""
         - ppc64le
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
         with:
           python-version: "3.10"
@@ -119,7 +119,7 @@ jobs:
       matrix:
         target: [x64, x86]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
         with:
           python-version: '3.10'
@@ -152,7 +152,7 @@ jobs:
       matrix:
         target: [x86_64, aarch64]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
         with:
           python-version: '3.10'
@@ -180,7 +180,7 @@ jobs:
   sdist:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Build sdist
         uses: PyO3/maturin-action@v1
         with: