diff --git a/requirements.txt b/requirements.txt
index 44a6f14b4..860e2d368 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 Twisted>=10.0.0,<=16.6
-lxml
+lxml>=2.3
 pyOpenSSL
 cssselect>=0.9
 w3lib>=1.8.0
diff --git a/setup.py b/setup.py
index 320e5081b..d59f0e25c 100644
--- a/setup.py
+++ b/setup.py
@@ -40,7 +40,7 @@ setup(
         'Twisted>=10.0.0,<=16.6',
         'w3lib>=1.8.0',
         'queuelib',
-        'lxml',
+        'lxml>=2.3',
         'pyOpenSSL',
         'cssselect>=0.9',
         'six>=1.5.2',