diff --git a/.github/workflows/CI.yaml b/.github/workflows/CI.yaml
index 248abb4a..0e57ac50 100644
--- a/.github/workflows/CI.yaml
+++ b/.github/workflows/CI.yaml
@@ -24,7 +24,7 @@ jobs:
     strategy:
       matrix:
         os: [macOS-latest, ubuntu-latest] #, windows-latest
-        python-version: [3.7] #
+        python-version: [3.7, 3.9.4] #
 
     steps:
     - uses: actions/checkout@v1