diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
index 021caf8..049f7ac 100644
--- a/.github/workflows/continuous-integration.yml
+++ b/.github/workflows/continuous-integration.yml
@@ -38,7 +38,7 @@ jobs:
       run:  echo 127.0.0.1 `hostname` | sudo tee -a /etc/hosts > /dev/null
 
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Setup MPI (${{ matrix.mpi }})
       uses: mpi4py/setup-mpi@v1
@@ -95,7 +95,7 @@ jobs:
     steps:
 
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Use Python ${{ matrix.py }}
       uses: actions/setup-python@v4
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 911f129..e751e46 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -17,7 +17,7 @@ jobs:
     steps:
 
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Setup Python
       uses: actions/setup-python@v4