diff --git a/requirements.txt b/requirements.txt
index 150b0c5..0951713 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ chatterbot-corpus==1.2.0
 codecov==2.0.15
 Flask==1.0.2
 GitPython==2.1.11
-lxml==4.3.2
+lxml==4.9.1
 pytest==4.3.1
 pytest-cov==2.6.1
 python-dotenv==0.10.1