diff --git a/requirements.txt b/requirements.txt
index fd94c8b..59b9466 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,7 +21,7 @@ jaraco.functools==2.0
 jdcal==1.4.1
 joblib==0.14.0
 kiwisolver==1.1.0
-lxml==4.4.1
+lxml==4.6.5
 matplotlib==3.1.1
 more-itertools==7.2.0
 murmurhash==1.0.2