diff --git a/requirements.txt b/requirements.txt
index 80305d0..97f4f3c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ docx2txt==0.8
 EbookLib==0.17.1
 extract-msg==0.23.1
 IMAPClient==2.1.0
-lxml==4.4.1
+lxml==4.9.1
 nltk==3.4.5
 olefile==0.46
 pdfminer.six==20181108