diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8953a916b..0ec3cfe8e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: actions/setup-node@v6
         with:
           node-version: "lts/*"
diff --git a/.github/workflows/codeowners-merge.yml b/.github/workflows/codeowners-merge.yml
index 6ce28265a..89d189dc5 100644
--- a/.github/workflows/codeowners-merge.yml
+++ b/.github/workflows/codeowners-merge.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Run Codeowners merge check
         uses: OSS-Docs-Tools/code-owner-self-merge@1.6.8
         if: github.repository == 'microsoft/TypeScript-DOM-lib-generator'
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 3db9b3bb2..ee3243450 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -57,7 +57,7 @@ jobs:
         # your codebase is analyzed, see https://docs.github.com/en/code-security/code-scanning/creating-an-advanced-setup-for-code-scanning/codeql-code-scanning-for-compiled-languages
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
 
     # Add any setup steps before running the `github/codeql-action/init` action.
     # This includes steps like installing compilers or runtimes (`actions/setup-node`
diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index e5ec501d5..248a574b6 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           submodules: true  # Ensures submodules are cloned
 
diff --git a/.github/workflows/test_typescript.yml b/.github/workflows/test_typescript.yml
index 388185c78..43b9d6e78 100644
--- a/.github/workflows/test_typescript.yml
+++ b/.github/workflows/test_typescript.yml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - uses: actions/setup-node@v6
         with:
diff --git a/.github/workflows/update-core-deps.yml b/.github/workflows/update-core-deps.yml
index 04851b52f..733cab279 100644
--- a/.github/workflows/update-core-deps.yml
+++ b/.github/workflows/update-core-deps.yml
@@ -11,7 +11,7 @@ jobs:
   update-webref:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - uses: actions/setup-node@v6
         with: