diff --git a/.github/workflows/mypy-action.yml b/.github/workflows/mypy-action.yml
index 16415db8a..09be1abde 100644
--- a/.github/workflows/mypy-action.yml
+++ b/.github/workflows/mypy-action.yml
@@ -5,6 +5,7 @@ jobs:
     name: runner / mypy
     runs-on: ubuntu-latest
     steps:
+      - run: pip install mypy
       - uses: actions/checkout@v4
       - uses: tsuyoshicho/action-mypy@v4
         with: