diff --git a/requirements.txt b/requirements.txt
index 6d733cc..12594f8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ cffi==1.12.1
 chardet==3.0.4
 coverage==4.5.2
 coveralls==1.6.0
-cryptography==2.5
+cryptography==3.2
 docopt==0.6.2
 docutils==0.14
 futures==3.1.1