diff --git a/requirements.txt b/requirements.txt
index 19292b5..a38073b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ pytz>=2020.1
 beautifulsoup4>=4.7.0,<5.0.0
 boto3>=1.9.201,<2.0.0
 requests>=2.23.0,<3.0.0
-lxml>=4.6.5
+lxml>=4.6.5,<6.0.0
 botocore>=1.12.201,<2.0.0
 packaging
 setuptools