diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index c962be9..ee84114 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -18,8 +18,10 @@ jobs:
         python-version: '3.10'
         cache: pip
     - name: install
-      run: pip3 install --quiet --editable . ruff
+      run: pip3 install --quiet --editable . ruff mypy types-requests
     - name: unit test
       run: python3 -m unittest discover --verbose
     - name: ruff
       run: ruff check --output-format=github .
+    - name: mypy
+      run: mypy .