diff --git a/requirements.txt b/requirements.txt
index 4663c51..1dfacdd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ idna==2.8
 jmespath==0.9.4
 joblib==0.13.2
 kiwisolver==1.1.0
-lxml==4.3.4
+lxml==4.9.1
 matplotlib==3.1.0
 nltk==3.6.6
 numpy==1.22.0