diff --git a/requirements.txt b/requirements.txt
index 0df9a558c..7c52c14d0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-Twisted>=10.0.0
+Twisted>=10.0.0,<14.0.0
 lxml
 pyOpenSSL
 cssselect>=0.9
diff --git a/setup.py b/setup.py
index 6efe64074..1d6c444d0 100644
--- a/setup.py
+++ b/setup.py
@@ -123,7 +123,7 @@ except ImportError:
     from distutils.core import setup
 else:
     setup_args['install_requires'] = [
-        'Twisted>=10.0.0',
+        'Twisted>=10.0.0,<14.0.0',
         'w3lib>=1.2',
         'queuelib',
         'lxml',