diff --git a/requirement.txt b/requirement.txt
index ed3ccd0..51e14c3 100644
--- a/requirement.txt
+++ b/requirement.txt
@@ -65,7 +65,7 @@ jsonpickle==0.9.6
 jsonschema==2.6.0
 jws==0.1.3
 lazy-object-proxy==1.4.3
-lxml==4.4.1
+lxml==4.9.1
 MarkupSafe==1.1.1
 mccabe==0.6.1
 more-itertools==7.2.0
diff --git a/requirements.txt b/requirements.txt
index ed3ccd0..51e14c3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -65,7 +65,7 @@ jsonpickle==0.9.6
 jsonschema==2.6.0
 jws==0.1.3
 lazy-object-proxy==1.4.3
-lxml==4.4.1
+lxml==4.9.1
 MarkupSafe==1.1.1
 mccabe==0.6.1
 more-itertools==7.2.0