diff --git a/2017/solutions/rllchatbot/requirements.txt b/2017/solutions/rllchatbot/requirements.txt
index d3da83a5..927e22d4 100644
--- a/2017/solutions/rllchatbot/requirements.txt
+++ b/2017/solutions/rllchatbot/requirements.txt
@@ -57,7 +57,7 @@ jupyter-console==5.1.0
 jupyter-core==4.3.0
 Lasagne==0.1
 lazy-object-proxy==1.3.1
-lxml==3.3.3
+lxml==4.6.5
 Markdown==2.6.9
 MarkupSafe==1.0
 matplotlib==1.3.1