diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index c88ba61..4d74ee5 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -7,12 +7,17 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python_version:
+          - "3"
+          - "3.7"
     steps:
     - uses: actions/checkout@v2
     - name: Set up Python
       uses: actions/setup-python@v2
       with:
-        python-version: 3
+        python-version: ${{ matrix.python_version }}
     - run: pip install .[test] coverage
     - name: Test
       run: coverage run --source=./dargs -m unittest -v && coverage report