diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index 19cb7c6..a46faa0 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -11,7 +11,7 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-latest
+    runs-on: Ubuntu-20.04
     strategy:
       matrix:
         python-version: [3.7, 3.8, 3.9]
@@ -25,7 +25,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        python -m pip install flake8 Pillow click nose parameterized pybind11-stubgen
+        python -m pip install flake8 ninja Pillow click nose parameterized pybind11-stubgen
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
     - name: Lint with flake8
       run: |