diff --git a/setup.py b/setup.py
index d6ee55a..d10123c 100644
--- a/setup.py
+++ b/setup.py
@@ -71,6 +71,7 @@ tests_require = [
 ] + docs_require
 
 install_requires = [
+    'chardet==3.0.4',
     'aiohttp==3.7.4',
     'bigchaindb-abci==1.0.7',
     'cryptoconditions==0.8.1',