diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 5c850b8d..9e1a006b 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -29,7 +29,7 @@ jobs:
     - run: echo "PYTHONPATH=${GITHUB_WORKSPACE}" >> $GITHUB_ENV
     - run: make prereqs
     - run: make version
-    - if: matrix.python_version == '3.9'
+    - if: matrix.python-version == '3.9'
       run: pipenv run pip install -U 'traitlets>=5.1.1'
     - run: make install
     - run: make lint