diff --git a/chapter1/requirements.txt b/chapter1/requirements.txt
index 758bbda..3d8f023 100644
--- a/chapter1/requirements.txt
+++ b/chapter1/requirements.txt
@@ -18,7 +18,7 @@ click==4.1
 colorama==0.2.5
 configobj==5.0.6
 CorePost==0.0.16
-cryptography==1.8.1
+cryptography==3.2
 cssselect==0.9.1
 cycler==0.10.0
 dateutils==0.6.6