diff --git a/.github/workflows/ci-audit.yaml b/.github/workflows/ci-audit.yaml
index 303282de9..7d78fb857 100644
--- a/.github/workflows/ci-audit.yaml
+++ b/.github/workflows/ci-audit.yaml
@@ -19,7 +19,7 @@ jobs:
       run:
         working-directory: ./runtime
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Install cargo audit
         uses: taiki-e/install-action@v2
diff --git a/.github/workflows/ci-docs.yaml b/.github/workflows/ci-docs.yaml
index 1082c3315..0e1680a11 100644
--- a/.github/workflows/ci-docs.yaml
+++ b/.github/workflows/ci-docs.yaml
@@ -23,7 +23,7 @@ jobs:
         working-directory: ./clients/js
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Setup pnpm
         uses: pnpm/action-setup@v4
@@ -87,7 +87,7 @@ jobs:
         working-directory: ./contracts
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - uses: pnpm/action-setup@v4
         name: Install pnpm
@@ -133,7 +133,7 @@ jobs:
         working-directory: ./clients/py
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up Python
         uses: actions/setup-python@v5
diff --git a/.github/workflows/ci-lint.yaml b/.github/workflows/ci-lint.yaml
index 5454a6220..e78dafc60 100644
--- a/.github/workflows/ci-lint.yaml
+++ b/.github/workflows/ci-lint.yaml
@@ -31,7 +31,7 @@ jobs:
         working-directory: ./runtime
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up Rust
         run: rustup show
@@ -50,7 +50,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Setup pnpm
         uses: pnpm/action-setup@v4
@@ -79,7 +79,7 @@ jobs:
         working-directory: ./clients/py
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - name: Install dependencies
         run: python3 -mpip install --user -r requirements.txt
       - name: Install dev dependencies
@@ -97,7 +97,7 @@ jobs:
         working-directory: ./clients/go
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           # Fetch all history so gitlint can check the relevant commits.
           fetch-depth: '0'
diff --git a/.github/workflows/ci-playwright.yaml b/.github/workflows/ci-playwright.yaml
index cfeb53751..11b5fbd0f 100644
--- a/.github/workflows/ci-playwright.yaml
+++ b/.github/workflows/ci-playwright.yaml
@@ -25,7 +25,7 @@ jobs:
       SAPPHIRE_LOCALNET_HTTP_PROXY_PORT: 3001
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         
       - name: Setup pnpm
         uses: pnpm/action-setup@v4
diff --git a/.github/workflows/ci-reproducibility.yaml b/.github/workflows/ci-reproducibility.yaml
index 805f1240d..f1cf7fae9 100644
--- a/.github/workflows/ci-reproducibility.yaml
+++ b/.github/workflows/ci-reproducibility.yaml
@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Build runtime, 1.
         id: build-1
@@ -48,7 +48,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Build runtime, 1.
         id: build-1
diff --git a/.github/workflows/ci-test-demos.yaml b/.github/workflows/ci-test-demos.yaml
index 3e08d82a4..fba93174e 100644
--- a/.github/workflows/ci-test-demos.yaml
+++ b/.github/workflows/ci-test-demos.yaml
@@ -27,14 +27,14 @@ jobs:
           --health-cmd="test -f /CONTAINER_READY"
           --health-start-period=90s
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
           go-version: "1.22.x"
 
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           repository: oasisprotocol/demo-starter-go
           path: ./demos/demo-starter-go
diff --git a/.github/workflows/ci-test-go.yaml b/.github/workflows/ci-test-go.yaml
index 8614c4a05..a3f88a902 100644
--- a/.github/workflows/ci-test-go.yaml
+++ b/.github/workflows/ci-test-go.yaml
@@ -32,7 +32,7 @@ jobs:
           --health-cmd="test -f /CONTAINER_READY"
           --health-start-period=90s
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Set up Go
         uses: actions/setup-go@v5
diff --git a/.github/workflows/ci-test.yaml b/.github/workflows/ci-test.yaml
index a6f503d83..aa0453a1a 100644
--- a/.github/workflows/ci-test.yaml
+++ b/.github/workflows/ci-test.yaml
@@ -27,7 +27,7 @@ jobs:
         working-directory: ./runtime
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up Rust
         run: rustup show
@@ -46,7 +46,7 @@ jobs:
         working-directory: ./runtime
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       # gcc-multilib is required for bindgen to work for SGX.
       - name: Install dependencies
@@ -68,7 +68,7 @@ jobs:
         working-directory: ./clients/js
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Setup pnpm
         uses: pnpm/action-setup@v4
@@ -106,7 +106,7 @@ jobs:
         working-directory: ./clients/py
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up Python
         uses: actions/setup-python@v5
@@ -140,7 +140,7 @@ jobs:
         working-directory: ./examples/foundry
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Install libclang-dev, cmake
         run: sudo apt-get update && sudo apt-get install -y libclang-dev cmake
@@ -168,7 +168,7 @@ jobs:
         working-directory: ./integrations/foundry
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Install libclang-dev, cmake
         run: sudo apt-get update && sudo apt-get install -y libclang-dev cmake
diff --git a/.github/workflows/contracts-test.yaml b/.github/workflows/contracts-test.yaml
index 43329e94f..ddc730e1a 100644
--- a/.github/workflows/contracts-test.yaml
+++ b/.github/workflows/contracts-test.yaml
@@ -25,7 +25,7 @@ jobs:
       SAPPHIRE_LOCALNET_HTTP_PROXY_PORT: 3001
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - name: Install jq
         run: sudo apt install -y jq
       - name: Setup pnpm
diff --git a/.github/workflows/publish.yaml b/.github/workflows/publish.yaml
index e278d0623..87a119033 100644
--- a/.github/workflows/publish.yaml
+++ b/.github/workflows/publish.yaml
@@ -21,7 +21,7 @@ jobs:
   publish:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Setup pnpm
         uses: pnpm/action-setup@v4
         id: pnpm-install
@@ -76,7 +76,7 @@ jobs:
     needs: publish
     if: startsWith(github.ref_name, 'contracts/v')
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Extract version from tag
         id: extract-tag-version
         env:
@@ -105,7 +105,7 @@ jobs:
     runs-on: ubuntu-latest
     if: startsWith(github.ref_name, 'clients/py/v')
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       
       - name: Set up Python
         uses: actions/setup-python@v5
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index 5ddeb55fd..48971b08f 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up Go
         uses: actions/setup-go@v5