diff --git a/setup.py b/setup.py
index 8b5f1e4..c21bbc2 100644
--- a/setup.py
+++ b/setup.py
@@ -55,6 +55,7 @@ setup(
         'ecdsa==0.11',
         'six>=1.8.0',
         'two1>=3.10.8',
+        'pycryptodome==3.4.7',
         'rlp>=0.6.0'
     ]
 )