diff --git a/.github/workflows/1_create_release_pr.yml b/.github/workflows/1_create_release_pr.yml
index 05e9536f..4f5c3dd9 100644
--- a/.github/workflows/1_create_release_pr.yml
+++ b/.github/workflows/1_create_release_pr.yml
@@ -20,7 +20,7 @@ jobs:
         uses: cylc/release-actions/stage-1/sanitize-inputs@v1
 
       - name: Checkout repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: ${{ env.BASE_REF }}
           fetch-depth: 0  # need to fetch all commits to check contributors
diff --git a/.github/workflows/2_auto_publish_release.yml b/.github/workflows/2_auto_publish_release.yml
index 71dd7025..1268e62d 100644
--- a/.github/workflows/2_auto_publish_release.yml
+++ b/.github/workflows/2_auto_publish_release.yml
@@ -22,7 +22,7 @@ jobs:
     steps:
 
     - name: Checkout repo
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         ref: ${{ env.MERGE_SHA }}
 
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 70704a2b..1d33e30c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -24,7 +24,7 @@ jobs:
             python: '3.8'
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup Python
         uses: actions/setup-python@v4
diff --git a/.github/workflows/shortlog.yml b/.github/workflows/shortlog.yml
index ea157a9a..f251e155 100644
--- a/.github/workflows/shortlog.yml
+++ b/.github/workflows/shortlog.yml
@@ -14,7 +14,7 @@ jobs:
     timeout-minutes: 5
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0  # need to fetch all commits to check contributors
 
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7df5d2d5..f73ffd68 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -22,7 +22,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Brew Install
         if: startsWith(matrix.os, 'macos')
diff --git a/.github/workflows/update_copyright.yml b/.github/workflows/update_copyright.yml
index bcba64a9..ca79c505 100644
--- a/.github/workflows/update_copyright.yml
+++ b/.github/workflows/update_copyright.yml
@@ -29,7 +29,7 @@ jobs:
     steps:
 
       - name: Checkout repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Configure git
         uses: cylc/release-actions/configure-git@v1
diff --git a/.github/workflows/update_ui.yml b/.github/workflows/update_ui.yml
index cc679669..db393db7 100644
--- a/.github/workflows/update_ui.yml
+++ b/.github/workflows/update_ui.yml
@@ -23,7 +23,7 @@ jobs:
 
     steps:
       - name: checkout cylc-uiserver
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: ${{ inputs.base-branch }}