diff --git a/tox.ini b/tox.ini
index 33a334f1c9b..78ca0756576 100644
--- a/tox.ini
+++ b/tox.ini
@@ -26,6 +26,7 @@ setenv =
 deps =
     pyqt5==5.12.*
     pyqtwebengine==5.12.*
+    git+https://github.com/biolab/orange-widget-base.git@master
 commands_pre =
     # Verify installed packages have compatible dependencies
     pip check