diff --git a/.github/workflows/code.yml b/.github/workflows/code.yml
index c33a9c95..ac79027f 100644
--- a/.github/workflows/code.yml
+++ b/.github/workflows/code.yml
@@ -18,7 +18,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Install python packages
         uses: ./.github/actions/install_requirements
@@ -48,7 +48,7 @@ jobs:
 
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
@@ -70,7 +70,7 @@ jobs:
 
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
@@ -88,7 +88,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout workflow branch
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
@@ -97,7 +97,7 @@ jobs:
         uses: ./.github/actions/get_branch
 
       - name: Checkout badges branch
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: gh-badges
 
@@ -127,7 +127,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           # Need this to get version number from last tag
           fetch-depth: 0
@@ -167,7 +167,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       # image names must be all lower case
       - name: Generate image repo name
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 77ebe239..4ec63f97 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -15,7 +15,7 @@ jobs:
         run: sleep 60
 
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           # Need this to get version number from last tag
           fetch-depth: 0
diff --git a/.github/workflows/docs_clean.yml b/.github/workflows/docs_clean.yml
index a67e1881..e324640e 100644
--- a/.github/workflows/docs_clean.yml
+++ b/.github/workflows/docs_clean.yml
@@ -18,7 +18,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: gh-pages
 
diff --git a/.github/workflows/linkcheck.yml b/.github/workflows/linkcheck.yml
index 82dc09bf..a3ab5bd3 100644
--- a/.github/workflows/linkcheck.yml
+++ b/.github/workflows/linkcheck.yml
@@ -17,7 +17,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Install Pandoc
         run: sudo apt-get install pandoc