diff --git a/chapter01/requirements.txt b/chapter01/requirements.txt
index ec72ce3..18e85bc 100644
--- a/chapter01/requirements.txt
+++ b/chapter01/requirements.txt
@@ -1,7 +1,7 @@
 bcrypt==3.2.0
 certifi==2020.6.20
 cffi==1.14.2
-cryptography==3.1
+cryptography==3.3.2
 decorator==4.4.2
 lutils==2.11.74
 paramiko==2.7.2