diff --git a/requirements_dev.txt b/requirements_dev.txt
index b438895b..982a63b6 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -7,7 +7,7 @@ mock==2.0.0
 tox==3.0.0
 coverage==4.5.1
 Sphinx==1.7.5
-cryptography==2.2.2
+cryptography==2.3
 PyYAML==3.13 # pyup: ignore
 future==0.16.0
 scipy>=0.17.0