diff --git a/.github/workflows/fortnightly.yml b/.github/workflows/fortnightly.yml
index 9a68880..cd5689f 100644
--- a/.github/workflows/fortnightly.yml
+++ b/.github/workflows/fortnightly.yml
@@ -43,7 +43,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         fetch-depth: 0
     - name: Set up Python
diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 9062f57..77d3c44 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -42,7 +42,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         fetch-depth: 0
     - name: Set up Python
@@ -65,7 +65,7 @@ jobs:
       fail-fast: false
     steps:
     - name: Checkout code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         fetch-depth: 0
     - name: Set up Python