diff --git a/.github/workflows/ci_tests.yml b/.github/workflows/ci_tests.yml
index 5373804..c800fd6 100644
--- a/.github/workflows/ci_tests.yml
+++ b/.github/workflows/ci_tests.yml
@@ -9,7 +9,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Set up Python 3.7
       uses: actions/setup-python@v4
@@ -41,7 +41,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Setup Python 3.7
       uses: actions/setup-python@v4
diff --git a/.github/workflows/update_ghpages.yml b/.github/workflows/update_ghpages.yml
index fe1e790..8573c24 100644
--- a/.github/workflows/update_ghpages.yml
+++ b/.github/workflows/update_ghpages.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Set up Python
       uses: actions/setup-python@v4 #Uses python install action from here: https://github.com/marketplace?type=actions