diff --git a/requirements.txt b/requirements.txt
index 885928c..f5b4b74 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ certifi==2018.8.24
 cffi==1.11.5
 chardet==3.0.4
 click==7.0
-cryptography==2.3.1
+cryptography==3.2
 defusedxml==0.5.0
 dnspython==1.15.0
 exchangelib==1.12.0