diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index 6ad08be..578efec 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -23,7 +23,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install mypy lxml coverage
+        pip install mypy lxml coverage flake8
         pip install -e .
     - name: Lint with flake8
       run: |