diff --git a/requirement.txt b/requirement.txt
index 646c3fc..d7927d2 100644
--- a/requirement.txt
+++ b/requirement.txt
@@ -5,7 +5,7 @@ definitions==0.2.0
 htmldom==2.0
 idna==2.7
 languageflow==1.1.7a3
-lxml==4.2.5
+lxml==4.9.1
 nltk==3.3
 numpy==1.15.2
 pandas==0.23.4