diff --git a/docs/source/requirements.txt b/docs/source/requirements.txt
index eafacc3..4557cc0 100644
--- a/docs/source/requirements.txt
+++ b/docs/source/requirements.txt
@@ -4,7 +4,7 @@ Babel==2.6.0
 certifi==2018.11.29
 cffi==1.11.5
 chardet==3.0.4
-cryptography==2.4.2
+cryptography==3.2
 docutils==0.14
 idna==2.8
 imagesize==1.1.0