diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0e0c69745..ffdbc4420 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
         with:
           submodules: true  # Ensures submodules are cloned
 
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 7aef4199a..d5a658e2f 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -40,7 +40,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b # v4.1.5
+        uses: actions/checkout@ff7abcd0c3c05ccf6adc123a8cd1fd4fb30fb493 # v4.1.5
 
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL
diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 79cd138b9..7995a2acd 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 1ce6fb5fc..4aebe09c2 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
         with:
           submodules: true  # Ensures submodules are cloned
 
diff --git a/.github/workflows/update-core-deps.yml b/.github/workflows/update-core-deps.yml
index 0017fddc3..8fc654790 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
         with:
           submodules: true  # Ensure submodules are checked out