diff --git a/docker/requirements.txt b/docker/requirements.txt
index 4888044..367fd6a 100644
--- a/docker/requirements.txt
+++ b/docker/requirements.txt
@@ -4,7 +4,7 @@ numpy==1.17.2
 scipy==1.3.3
 scikit-learn==0.22
 nltk==3.4.5
-lxml==4.6.2
+lxml==4.9.1
 beautifulsoup4==4.8.0
 pandas==0.24.2
 matplotlib==3.0.3