diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 52ca2414c..736c41fa6 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -48,6 +48,12 @@ jobs:
           - python-version: pypy3.9
             os: ubuntu-latest
             toxenv: pypy3
+          - python-version: "3.5"
+            os: ubuntu-20.04
+            toxenv: py35
+          - python-version: "3.6"
+            os: ubuntu-20.04
+            toxenv: py36
           - python-version: "3.7"
             os: ubuntu-latest
             toxenv: py37