diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 1a3387b8..89bef185 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -22,6 +22,8 @@ jobs:
       run: poetry install --with dev
     - name: Run flake8 Check
       run: poetry run flake8 .
+    - name: Run mypy install types
+      run: poetry run mypy --install-types
     - name: Run mypy check
       run: poetry run mypy .