diff --git a/Assignment1/requirements.txt b/Assignment1/requirements.txt
index b00d152..51ef7cf 100644
--- a/Assignment1/requirements.txt
+++ b/Assignment1/requirements.txt
@@ -6,4 +6,4 @@ matplotlib==2.1.1
 xlrd==1.1.0
 ipdb==0.10.3
 Pillow==5.0.0
-lxml==4.1.1
+lxml==4.9.1