diff --git a/requirements.txt b/requirements.txt
index 66b0f46..ce272a0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 certifi==2017.4.17
 chardet==3.0.4
 idna==2.5
-lxml==4.6.5
+lxml==4.9.1
 numpy==1.14.1
 pandas==0.22
 pytest