diff --git a/requirements.txt b/requirements.txt
index a524440..47a35e0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,5 +2,5 @@ pdfminer3k==1.3.0
 requests==2.9.1
 pyquery==1.2.11
 urllib3==1.14
-lxml==3.6.0
+lxml==4.9.1
 PyPDF2==1.25.1