diff --git a/requirements.txt b/requirements.txt
index cf5bbb1..e590a4f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 PyChromecast>=2.3.0
 netifaces>=0.10.5
 python-daemon>=2.2.0
-scons>=3.0.1
+scons>=3.0.1,<4.2