diff --git a/Lecture5/requirements.txt b/Lecture5/requirements.txt
index 70bab6d..a2d67c9 100644
--- a/Lecture5/requirements.txt
+++ b/Lecture5/requirements.txt
@@ -1,7 +1,7 @@
 attrs==19.3.0
 backcall==0.1.0
 bleach==3.1.0
-certifi==2019.11.28
+certifi==2022.12.7
 cycler==0.10.0
 decorator==4.4.1
 defusedxml==0.6.0