diff --git a/tox.ini b/tox.ini
index 349b5577..a3d2df60 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,6 +7,7 @@ commands =
 deps =
     mg34: pymongo>=3.4,<3.5
     mg36: pymongo>=3.6,<3.7
-    mg39: pymongo>=3.9,<4.0
+    mg39: pymongo>=3.9,<3.10
+    mg310: pymongo>=3.10,<3.11
 setenv =
     PYTHON_EGG_CACHE = {envdir}/python-eggs