diff --git a/api/requirements.txt b/api/requirements.txt
index 59e88d3..2d36bef 100644
--- a/api/requirements.txt
+++ b/api/requirements.txt
@@ -9,7 +9,7 @@ idna==2.10
 itsdangerous==1.1.0
 Jinja2==2.11.2
 joblib==0.17.0
-lxml==4.6.1
+lxml==4.9.1
 MarkupSafe==1.1.1
 nltk==3.5
 numpy==1.16.6