diff --git a/setup.cfg b/setup.cfg
index 18a5b71d7..7010c390f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -58,7 +58,7 @@ tests =
     pytest-tornasync
     jupyter_packaging
     coverage
-    selenium>2.4
+    selenium>2.4,<4.3
     codecov
     nbval
     requests-mock