diff --git a/requirements.txt b/requirements.txt
index c65d34042..5f8060af5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ six
 argparse
 cchardet>=1.1.2
 certifi>=2017.4.17
-chardet<3.1.0,>=3.0.2
+chardet>=3.0.2,<4.1.0
 cssselect
 feedparser==5.2.1
 geonamescache==0.20