diff --git a/requirements.txt b/requirements.txt
index a9df722..70800c5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ attrdict==2.0.0
 certifi==2018.1.18
 cffi==1.11.5
 chardet==3.0.4
-cryptography==2.3
+cryptography==3.2
 cytoolz==0.9.0.1
 decorator==4.2.1
 eth-abi==1.0.0