diff --git a/requirements.txt b/requirements.txt
index 91493ad..e8df1e6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ decorator==4.0.11
 docopt==0.6.2
 idna==2.6
 imageio==2.2.0
-lxml==4.0.0
+lxml==4.9.1
 moviepy==0.2.3.2
 nltk==3.2.5
 numpy==1.13.3