diff --git a/requirements.txt b/requirements.txt
index c676f783..12f2775d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ networkx==2.1
 openpyxl==2.5.3
 numpy>=1.14.2
 Cython==0.28.2
-lxml==4.1.1
+lxml==4.6.3
 six==1.11.0
 scipy>=1.0.0
 python-dateutil==2.8.0