diff --git a/requirements.txt b/requirements.txt
index 42e1058d..caede6af 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -51,7 +51,7 @@
 # plugins\verbose.py: 14
 # searchTreeList.py: 1
 # wxPyMail.py: 22
-wxPython >= 4.1.0 
+wxPython < 4.1.0 
 
 # Components.py: 44
 # Container.py: 39