diff --git a/requirements.txt b/requirements.txt
index 6828e76c7..4c8daaf73 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,6 +6,6 @@ pbkdf2
 py_ecc
 rlp>=0.4.7
 https://github.com/ethereum/ethash/tarball/master
-pycryptodome==3.4.6
+pycryptodome==3.6.6
 coincurve>=5.0.1
 future