diff --git a/requirements_opacity_api.txt b/requirements_opacity_api.txt
index 4563853..490c6c3 100644
--- a/requirements_opacity_api.txt
+++ b/requirements_opacity_api.txt
@@ -6,7 +6,7 @@ certifi==2019.11.28
 cffi==1.14.0
 chardet==3.0.4
 colorama==0.4.3
-cryptography==2.9
+cryptography==3.2
 cytoolz==0.10.1
 docutils==0.16
 eth-abi==2.1.1