diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1af04c4..dc2daff 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -35,7 +35,7 @@ jobs:
           - windows-2025
           - windows-2022
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - run:  bash -x build-cmake.sh
     - run:  bash check.sh
 
@@ -53,7 +53,7 @@ jobs:
           - macos-14
           - macos-13
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - uses: actions/setup-python@v5
       with: {python-version: '3.x'}
     - run:  python -m pip install meson ninja
@@ -74,6 +74,6 @@ jobs:
           - macos-14
           - macos-13
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - run:  make
     - run:  bash check.sh
diff --git a/.github/workflows/mpi4py.yml b/.github/workflows/mpi4py.yml
index c462803..84f4faf 100644
--- a/.github/workflows/mpi4py.yml
+++ b/.github/workflows/mpi4py.yml
@@ -23,7 +23,7 @@ jobs:
     steps:
 
     - name: Checkout mpi-stubs
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
       with:
         path: mpi-stubs
 
@@ -41,7 +41,7 @@ jobs:
         python-version: 3
 
     - name: Checkout mpi4py
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
       with:
         repository: mpi4py/mpi4py
         path: mpi4py