diff --git a/simptext/requirements.txt b/simptext/requirements.txt
index 8da5ca6..c209dee 100644
--- a/simptext/requirements.txt
+++ b/simptext/requirements.txt
@@ -17,7 +17,7 @@ jedi==0.9.0
 Jinja2==2.8
 json2xlsx==1.3
 kenlm==0.0.0
-lxml==3.6.0
+lxml==4.9.1
 MarkupSafe==0.23
 nltk==3.2.1
 numpy==1.11.1