diff --git a/requirements.txt b/requirements.txt
index cbce303..ddb6960 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,7 +15,7 @@ idna==2.6
 imagesize==0.7.1
 isodate==0.6.0
 Jinja2==2.9.6
-lxml==4.1.0
+lxml==4.6.5
 MarkupSafe==1.0
 matplotlib==2.1.0
 mne==0.15