diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index fdfe5410..3bfc19b0 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -20,7 +20,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ['3.x']
+        python-version: ['3.x', '3.6']
         exclude:
         # Looks like pypy on Windows is 32-bit, so don't test it since we
         # only work with 64-bit builds