diff --git a/.github/workflows/on-pull-request.yml b/.github/workflows/on-pull-request.yml
index 6575fcaa..03e769a0 100644
--- a/.github/workflows/on-pull-request.yml
+++ b/.github/workflows/on-pull-request.yml
@@ -40,7 +40,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python: [3.6, 3.7, 3.8]
+        python: [3.7, 3.8, 3.9]
     steps:
     - uses: actions/checkout@v1
     - name: Install Python dependencies