diff --git a/proj1/requirements.txt b/proj1/requirements.txt
index e911f7c..ce4f0b3 100644
--- a/proj1/requirements.txt
+++ b/proj1/requirements.txt
@@ -84,7 +84,7 @@ jupyterlab-launcher==0.4.0
 lazy-object-proxy==1.3.1
 llvmlite==0.20.0
 locket==0.2.0
-lxml==4.1.0
+lxml==4.6.2
 MarkupSafe==1.0
 matplotlib==2.1.0
 mccabe==0.6.1