diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 814ac13..63a0452 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        group: [0, 1, 2, 3]
+        group: [0, 1, 2, 3, 4]
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python 3.8