diff --git a/requirements.txt b/requirements.txt
index 269742d..0afa2e7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ certifi==2017.7.27.1
 chardet==3.0.4
 idna==2.6
 influxdb==4.1.1
-lxml==3.8.0
+lxml==4.9.1
 numpy==1.13.1
 pandas==0.20.3
 parse==1.8.2