diff --git a/chapter01/requirements.txt b/chapter01/requirements.txt
index ec72ce3..c9a4965 100644
--- a/chapter01/requirements.txt
+++ b/chapter01/requirements.txt
@@ -1,5 +1,5 @@
 bcrypt==3.2.0
-certifi==2020.6.20
+certifi==2022.12.7
 cffi==1.14.2
 cryptography==3.1
 decorator==4.4.2