diff --git a/assignment1/requirements.txt b/assignment1/requirements.txt
index 1311138..0e9d6ae 100644
--- a/assignment1/requirements.txt
+++ b/assignment1/requirements.txt
@@ -43,4 +43,4 @@ tornado==4.3
 traitlets==4.0.0
 wsgiref==0.1.2
 jupyter==1.0.0
-pillow==3.1.0
+pillow==9.0.0