diff --git a/.github/workflows/create-conda-envs.yml b/.github/workflows/create-conda-envs.yml
index 7c7097b5bac..ba80890b6f4 100644
--- a/.github/workflows/create-conda-envs.yml
+++ b/.github/workflows/create-conda-envs.yml
@@ -25,7 +25,7 @@ jobs:
         python: [3.7, 3.8, 3.9]
     steps:
       - name: checkout cylc-doc
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: configure python
         uses: actions/setup-python@v4
diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index b4ab55cbba4..0f3c2707948 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -73,7 +73,7 @@ jobs:
         uses: cylc/release-actions/configure-git@v1
 
       - name: checkout cylc-doc
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: ${{ inputs.cylc-flow-tag }}
           path: docs
@@ -109,7 +109,7 @@ jobs:
           working_directory: ./docs
 
       - name: checkout gh-pages
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: gh-pages
           path: gh-pages
diff --git a/.github/workflows/nightly.yml b/.github/workflows/nightly.yml
index 905d6226cca..87bf83917f5 100644
--- a/.github/workflows/nightly.yml
+++ b/.github/workflows/nightly.yml
@@ -64,7 +64,7 @@ jobs:
           python-version: '3.9'
 
       - name: checkout cylc-doc
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           path: docs
 
@@ -88,7 +88,7 @@ jobs:
           metomi_rose_opts: ''
 
       - name: checkout gh-pages branch
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: gh-pages
           path: gh-pages
diff --git a/.github/workflows/shortlog.yml b/.github/workflows/shortlog.yml
index 51ea62e976a..96c5cd6c155 100644
--- a/.github/workflows/shortlog.yml
+++ b/.github/workflows/shortlog.yml
@@ -14,7 +14,7 @@ jobs:
     timeout-minutes: 10
     steps:
       - name: Checkout
-        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 1147f399eb9..4a130a290c4 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -43,7 +43,7 @@ jobs:
             node-version: '16'
 
       - name: checkout cylc-doc
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: install dependencies
         uses: ./.github/actions/install-dependencies
diff --git a/.github/workflows/undeploy.yml b/.github/workflows/undeploy.yml
index 6f8ff091ce7..943e3a6f6a3 100644
--- a/.github/workflows/undeploy.yml
+++ b/.github/workflows/undeploy.yml
@@ -47,12 +47,12 @@ jobs:
         uses: cylc/release-actions/configure-git@v1
 
       - name: checkout cylc-doc
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           path: docs
 
       - name: checkout gh-pages
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: gh-pages
           path: gh-pages
diff --git a/.github/workflows/update_copyright.yml b/.github/workflows/update_copyright.yml
index c6276fd516e..1250f082520 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