diff --git a/requirements.txt b/requirements.txt
index 802f8d4..f2da913 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -88,7 +88,7 @@ lazy-object-proxy==1.3.1
 libarchive-c==2.8
 llvmlite==0.23.1
 locket==0.2.0
-lxml==4.2.1
+lxml==4.6.3
 Markdown==3.1.1
 MarkupSafe==1.0
 matplotlib==2.0.0