diff --git a/requirements.txt b/requirements.txt
index a6b402a..b0eec9a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -24,4 +24,4 @@ tensorflow==1.2.1
 Theano==0.9.0
 docopt==0.6.2
 setuptools-scm==1.15.6
-lxml==4.1.1
+lxml==4.9.1