diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 66447d8cc64..752e7feb81f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,7 +16,7 @@ jobs:
         os: [macos-latest, ubuntu-latest, windows-latest]
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: gradle/actions/wrapper-validation@v4
 
       - name: Set up JDK ${{ matrix.java }}
@@ -46,7 +46,7 @@ jobs:
     runs-on: ubuntu-latest
     name: Documentation Build
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
 
     - name: Set up Python 3.x
       uses: actions/setup-python@v5
@@ -69,12 +69,12 @@ jobs:
     name: Build AWS API Models
     steps:
       - name: Checkout Smithy
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           path: 'smithy'
 
       - name: Checkout api-models-aws
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           repository: aws/api-models-aws
           path: api-models-aws
diff --git a/.github/workflows/codeguru-reviewer.yml b/.github/workflows/codeguru-reviewer.yml
index 9ef38870842..f9a42898264 100644
--- a/.github/workflows/codeguru-reviewer.yml
+++ b/.github/workflows/codeguru-reviewer.yml
@@ -23,7 +23,7 @@ jobs:
         role-to-assume: arn:aws:iam::048169001733:role/GuruGitHubCICDRole
         aws-region: us-west-2
 
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       if: steps.iam-role.outcome == 'success'
       with:
         fetch-depth: 0
diff --git a/.github/workflows/make-docs.yml b/.github/workflows/make-docs.yml
index e67ee1f3b76..2b57515a90f 100644
--- a/.github/workflows/make-docs.yml
+++ b/.github/workflows/make-docs.yml
@@ -32,7 +32,7 @@ jobs:
         node-version: latest
 
     - name: Checkout repo 
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
     - name: Setup
       run: |
         mkdir -p $ARTIFACTS_DIR
@@ -78,7 +78,7 @@ jobs:
     needs: build-docs
     steps:
     - name: Checkout GitHub pages branch
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
       with:
         ref: 'gh-pages'
     - name: Download artifacts
diff --git a/.github/workflows/sdk-codegen-ci.yml b/.github/workflows/sdk-codegen-ci.yml
index a8aca7279e6..1f66f652ca2 100644
--- a/.github/workflows/sdk-codegen-ci.yml
+++ b/.github/workflows/sdk-codegen-ci.yml
@@ -15,7 +15,7 @@ jobs:
       - name: Increase Node Heap space
         run: echo "NODE_OPTIONS=--max-old-space-size=16384" >> $GITHUB_ENV
 
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - id: smithy-version
         uses: ./.github/workflows/checkout-and-build-smithy
 
@@ -23,7 +23,7 @@ jobs:
         run: echo "smithyVersion=${{ steps.smithy-version.outputs.smithy-version }}" >> $GITHUB_ENV
 
       - name: Checkout smithy-typescript
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           repository: smithy-lang/smithy-typescript
           path: smithy-typescript
@@ -32,7 +32,7 @@ jobs:
         run: cd smithy-typescript && ./gradlew -PsmithyVersion=$smithyVersion clean build publishToMavenLocal
 
       - name: Checkout aws-sdk-js-v3
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           repository: aws/aws-sdk-js-v3
           path: aws-sdk-js-v3
@@ -56,7 +56,7 @@ jobs:
         with:
           go-version: 1.19
 
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - id: smithy-version
         uses: ./.github/workflows/checkout-and-build-smithy
 
@@ -64,7 +64,7 @@ jobs:
         run: echo "smithyVersion=${{ steps.smithy-version.outputs.smithy-version }}" >> $GITHUB_ENV
 
       - name: Checkout smithy-go
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           repository: aws/smithy-go
           path: smithy-go
@@ -73,7 +73,7 @@ jobs:
         run: cd smithy-go/codegen && ./gradlew -PsmithyVersion=$smithyVersion clean build publishToMavenLocal
 
       - name: Checkout aws-sdk-go-v2
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           repository: aws/aws-sdk-go-v2
           path: aws-sdk-go-v2
@@ -95,7 +95,7 @@ jobs:
   build-aws-sdk-kotlin:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - id: smithy-version
         uses: ./.github/workflows/checkout-and-build-smithy
 
@@ -103,7 +103,7 @@ jobs:
         run: echo "smithyVersion=${{ steps.smithy-version.outputs.smithy-version }}" >> $GITHUB_ENV
 
       - name: Checkout smithy-kotlin
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           repository: smithy-lang/smithy-kotlin
           path: smithy-kotlin
@@ -112,7 +112,7 @@ jobs:
         run: cd smithy-kotlin && ./gradlew -PsmithyVersion=$smithyVersion clean build publishToMavenLocal
 
       - name: Checkout aws-sdk-kotlin
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           repository: awslabs/aws-sdk-kotlin
           path: aws-sdk-kotlin
@@ -135,7 +135,7 @@ jobs:
           java-version: 11
           distribution: 'corretto'
 
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - id: smithy-version
         uses: ./.github/workflows/checkout-and-build-smithy
 
@@ -143,13 +143,13 @@ jobs:
         run: echo "smithyVersion=${{ steps.smithy-version.outputs.smithy-version }}" >> $GITHUB_ENV
 
       - name: Checkout aws-crt-swift
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           repository: awslabs/aws-crt-swift
           path: Sources/SmithySwift/aws-crt-swift
 
       - name: Checkout smithy-swift
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           repository: smithy-lang/smithy-swift
           path: Sources/SmithySwift/smithy-swift
@@ -160,7 +160,7 @@ jobs:
           ./gradlew -PsmithyVersion=$smithyVersion clean build publishToMavenLocal
 
       - name: Checkout aws-sdk-swift
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           repository: awslabs/aws-sdk-swift
           path: Sources/SmithySwift/aws-sdk-swift
@@ -196,7 +196,7 @@ jobs:
           java-version: 11
           distribution: 'corretto'
 
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - id: smithy-version
         uses: ./.github/workflows/checkout-and-build-smithy
 
@@ -204,14 +204,14 @@ jobs:
         run: echo "smithyVersion=${{ steps.smithy-version.outputs.smithy-version }}" >> $GITHUB_ENV
 
       - name: Check out smithy-rs
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           repository: smithy-lang/smithy-rs
           ref: main
           path: smithy-rs
 
       - name: Check out aws-sdk-rust
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           repository: awslabs/aws-sdk-rust
           ref: main
diff --git a/.github/workflows/update-gradle-plugin.yml b/.github/workflows/update-gradle-plugin.yml
index 45b2245b0a1..80c206fb9b8 100644
--- a/.github/workflows/update-gradle-plugin.yml
+++ b/.github/workflows/update-gradle-plugin.yml
@@ -10,7 +10,7 @@ jobs:
   get-version:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Fetch latest smithy-gradle-plugin version
         id: fetch-latest