diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 50e0eee2..6cbf91f6 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python_version: [3.7, 3.8]
+        python_version: [3.7, 3.8, 3.9]
 
     services:
       mongo: