diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 1939a72c..608717d6 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -11,6 +11,12 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
         python-version: [3.6, 3.7, 3.8]
+        include:
+          - os: ubuntu-20.04
+            python-version: 3.6
+        exclude:
+          - os: ubuntu-latest
+            python-version: 3.6
 
     runs-on: ${{ matrix.os }}