diff --git a/requirements-dev.txt b/requirements-dev.txt
index 928cd04..2e97a9e 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,6 +1,6 @@
 argparse==1.2.1
 beautifulsoup4==4.4.0
-lxml==3.4.4
+lxml==4.9.1
 nose==1.3.7
 requests==2.7.0
 wheel==0.24.0
diff --git a/requirements.txt b/requirements.txt
index 4d7dae1..4b5cba8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 argparse==1.2.1
 beautifulsoup4==4.4.0
-lxml==3.4.4
+lxml==4.9.1
 requests==2.7.0
 wsgiref==0.1.2
diff --git a/setup.py b/setup.py
index 69b01a3..c90b089 100644
--- a/setup.py
+++ b/setup.py
@@ -19,6 +19,6 @@
         "argparse==1.2.1",
         "requests==2.7.0",
         "wsgiref==0.1.2",
-        "lxml==3.4.4",
+        "lxml==4.9.1",
     ],
 )