diff --git a/requirements_dev.txt b/requirements_dev.txt
index a5bd712..2d94bcd 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -7,7 +7,7 @@ certifi==2017.7.27.1
 cffi==1.10.0
 chardet==3.0.4
 coverage==4.4.1
-cryptography==2.0.2
+cryptography==3.2
 docutils==0.13.1
 flake8==3.4.1
 idna==2.5