diff --git a/requirements.txt b/requirements.txt
index cfa9f93..30f341e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ beautifulsoup4==4.7.1
 certifi==2019.3.9
 chardet==3.0.4
 idna==2.8
-lxml==4.3.3
+lxml==4.9.1
 Pillow==6.2.0
 python-pptx==0.6.18
 requests==2.22.0