diff --git a/.github/workflows/release-manual.yml b/.github/workflows/release-manual.yml
index d9159c8..a573a74 100644
--- a/.github/workflows/release-manual.yml
+++ b/.github/workflows/release-manual.yml
@@ -131,13 +131,24 @@ jobs:
       
       - name: Test on TestPyPI (optional)
         if: inputs.test_pypi
+        continue-on-error: true
         env:
           TWINE_USERNAME: __token__
           TWINE_PASSWORD: ${{ secrets.TEST_PYPI_API_TOKEN }}
         run: |
+          if [ -z "$TWINE_PASSWORD" ]; then
+            echo "⚠️  TEST_PYPI_API_TOKEN not configured, skipping TestPyPI upload"
+            echo "   To enable TestPyPI testing, add TEST_PYPI_API_TOKEN to repository secrets"
+            exit 0
+          fi
+          
           pip install twine
           echo "📦 Uploading to TestPyPI..."
-          twine upload --repository testpypi packages/*/dist/* --verbose
+          twine upload --repository testpypi packages/*/dist/* --verbose || {
+            echo "⚠️  TestPyPI upload failed, but continuing with release"
+            echo "   This is optional and won't block the release"
+            exit 0
+          }
           echo "✅ Test upload successful!"
           echo "📋 Check packages at: https://test.pypi.org/user/your-username/"
           echo ""
diff --git a/docs/RELEASE.md b/docs/RELEASE.md
index 0bc704a..dfb211c 100644
--- a/docs/RELEASE.md
+++ b/docs/RELEASE.md
@@ -7,6 +7,16 @@ Before releasing, ensure:
 2. ✅ CI has passed on the latest commit (check [Actions](https://github.com/yichuan-w/LEANN/actions/workflows/ci.yml))
 3. ✅ You have determined the new version number
 
+### Optional: TestPyPI Configuration
+
+To enable TestPyPI testing (recommended but not required):
+1. Get a TestPyPI API token from https://test.pypi.org/manage/account/token/
+2. Add it to repository secrets: Settings → Secrets → Actions → New repository secret
+   - Name: `TEST_PYPI_API_TOKEN`
+   - Value: Your TestPyPI token (starts with `pypi-`)
+
+**Note**: TestPyPI testing is optional. If not configured, the release will skip TestPyPI and proceed.
+
 ## 🚀 Recommended: Manual Release Workflow
 
 ### Via GitHub UI (Most Reliable)
diff --git a/packages/leann-backend-diskann/third_party/DiskANN b/packages/leann-backend-diskann/third_party/DiskANN
index af2a264..25339b0 160000
--- a/packages/leann-backend-diskann/third_party/DiskANN
+++ b/packages/leann-backend-diskann/third_party/DiskANN
@@ -1 +1 @@
-Subproject commit af2a26481e65232b57b82d96e68833cdee9f7635
+Subproject commit 25339b03413b5067c25b6092ea3e0f77ef8515c8