diff --git a/requirements.txt b/requirements.txt
index 41b8dab..1f759ca 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,6 +2,7 @@ beautifulsoup4==4.8.0
 certifi==2019.6.16
 chardet==3.0.4
 idna==2.8
+lxml==4.4.1
 requests==2.22.0
 soupsieve==1.9.3
 urllib3==1.25.3