diff --git a/requirements.txt b/requirements.txt
index a6f38bf4e..44a6f14b4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-Twisted>=10.0.0
+Twisted>=10.0.0,<=16.6
 lxml
 pyOpenSSL
 cssselect>=0.9
diff --git a/setup.py b/setup.py
index 0e99e7933..320e5081b 100644
--- a/setup.py
+++ b/setup.py
@@ -37,7 +37,7 @@ setup(
         'Topic :: Software Development :: Libraries :: Python Modules',
     ],
     install_requires=[
-        'Twisted>=10.0.0',
+        'Twisted>=10.0.0,<=16.6',
         'w3lib>=1.8.0',
         'queuelib',
         'lxml',