diff --git a/doc/py-requirements.txt b/doc/py-requirements.txt
index 4d98053..9a68d9b 100644
--- a/doc/py-requirements.txt
+++ b/doc/py-requirements.txt
@@ -4,7 +4,7 @@ bcrypt==3.1.3
 certifi==2017.7.27.1
 cffi==1.10.0
 chardet==3.0.4
-cryptography==2.0.3
+cryptography==3.2
 enum34==1.1.6
 httplib2==0.10.3
 idna==2.6