diff --git a/requirements.txt b/requirements.txt
index a9327dd4..570febe8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,7 +17,7 @@ idna==2.8
 inflect==2.1.0
 jaraco.itertools==4.4.2
 joblib==0.14.0
-lxml==4.6.3
+lxml==4.9.1
 mock==3.0.5
 more-itertools==7.0.0
 nltk==3.4.5