diff --git a/requirements.txt b/requirements.txt
index ef192c0f..ccde7079 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -38,7 +38,7 @@ lazr.restfulclient==0.13.3
 lazr.uri==1.0.3
 lockfile==0.8
 logilab-common==0.61.0
-lxml==3.3.3
+lxml==4.6.2
 matplotlib==1.3.1
 metric-learn==0.2.0
 munkres==1.0.7