diff --git a/requirements-dev.txt b/requirements-dev.txt
index 28014eb6..163df025 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,5 +1,6 @@
 aiofiles
 aiohttp==1.3.5
+chardet<=2.3.0
 beautifulsoup4
 coverage
 httptools