diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5ea4cd2..6a0a62c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -33,11 +33,12 @@ jobs:
 
     - run: python -m pip install --upgrade pip
     - run: pip install .[all]
-    - run: pip install ruff pytest httpx
+    - run: pip install ruff pytest httpx mypy
 
     - run: |
         ruff check src
         ruff format --diff src
+    - run: mypy src
     - run: pytest
       env:
         AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
diff --git a/pyproject.toml b/pyproject.toml
index 1060b95..84665c1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -49,3 +49,15 @@ mypy = "^1.8.0"
 [build-system]
 requires = ["poetry>=1.0.2"]
 build-backend = "poetry.masonry.api"
+
+[[tool.mypy.overrides]]
+module = [
+    "boto3",
+    "janome.tokenizer",
+    "nagisa",
+    "natto",
+    "Mykytea",
+    "sentencepiece",
+    "sudachipy",
+]
+ignore_missing_imports = true