diff --git a/requirements-dev.txt b/requirements-dev.txt
index 40046ab..14dcabc 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -36,7 +36,7 @@ itsdangerous==0.24
 Jinja2==2.10.1
 kombu==3.0.37
 lazy-object-proxy==1.4.2
-lxml==3.7.3
+lxml==4.9.1
 MarkupSafe==0.23
 mccabe==0.6.1
 mysql-connector==2.2.9
diff --git a/requirements.txt b/requirements.txt
index 5428594..c87a613 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -24,7 +24,7 @@ gitdb2==2.0.4
 itsdangerous==0.24
 Jinja2==2.10.1
 kombu==3.0.37
-lxml==3.7.3
+lxml==4.9.1
 MarkupSafe==0.23
 mysql-connector==2.2.9
 packaging==16.8