diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index f321b31ba..10a820be5 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -26,26 +26,6 @@ permissions:
   contents: read
 
 jobs:
-  build:
-    runs-on: ${{ matrix.platform.runner }}
-    strategy:
-      matrix:
-        platform:
-          - { os: linux, runner: ubuntu-24.04, target: x86_64, container: "ghcr.io/rust-cross/manylinux_2_28-cross:x86_64" }
-          - { os: macos, runner: macos-15, target: aarch64 }
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
-        with:
-          python-version: 3.x
-      - name: Build wheels
-        uses: PyO3/maturin-action@v1
-        with:
-          target: ${{ matrix.platform.target }}
-          args: --release --out dist --find-interpreter
-          sccache: 'true'
-          manylinux: auto
-          container: ${{ matrix.platform.container }}
   test:
     name: Run test
     uses: ./.github/workflows/_test.yml
diff --git a/.github/workflows/_test.yml b/.github/workflows/_test.yml
index 49247cb7c..715ba6b21 100644
--- a/.github/workflows/_test.yml
+++ b/.github/workflows/_test.yml
@@ -30,16 +30,28 @@ jobs:
           with:
             python-version: ${{ matrix.python-version }}
             cache: 'pip'
+        - name: Setup venv
+          run: |
+            python -m venv .venv
         - uses: actions/cache@v4
           with:
             path: .venv
             key: ${{ runner.os }}-pythonenv-${{ matrix.python-version }}-${{ hashFiles('pyproject.toml') }}
             restore-keys: |
               ${{ runner.os }}-pythonenv-${{ matrix.python-version }}-
-        - name: Python build & test
+        - name: Install Python toolchains
+          run: |
+            source .venv/bin/activate
+            pip install maturin pytest mypy
+        - name: Python build
           run: |
-            python -m venv .venv
             source .venv/bin/activate
-            pip install maturin pytest
             maturin develop
+        - name: Python type check (mypy)
+          run: |
+            source .venv/bin/activate
+            mypy python
+        - name: Python tests
+          run: |
+            source .venv/bin/activate
             pytest python/cocoindex/tests
\ No newline at end of file