diff --git a/requirements.txt b/requirements.txt
index 2130677..8d09655 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ bidict==0.21.2
 certifi==2021.5.30
 cffi==1.14.5
 requests==2.25.0
-chardet
+chardet==3.0.4
 greenlet==1.1.0
 idna==2.10
 pycparser==2.20