diff --git a/setup.py b/setup.py
index 767c6f6bfeb1f3239a275d60a10ca9b3f44f467c..2b60a10af4cc7a4ff134ab5ae7caf27db89d52c9 100644
--- a/setup.py
+++ b/setup.py
@@ -31,7 +31,7 @@ install_requires = [
     'zope.interface>=4.1.3',
     'protego>=0.1.15',
     'itemadapter>=0.1.0',
-    'h2>=3.2.0',
+    'h2>=3.0,<4.0',
 ]
 extras_require = {}
 cpython_dependencies = [
diff --git a/tox.ini b/tox.ini
index 6907c8906267865e01fe5d9a8f763e167033950e..353977519805618df588a731d58d22d40258feba 100644
--- a/tox.ini
+++ b/tox.ini
@@ -71,7 +71,7 @@ commands =
 deps =
     cryptography==2.0
     cssselect==0.9.1
-    h2==3.2.0
+    h2==3.0
     itemadapter==0.1.0
     parsel==1.5.0
     Protego==0.1.15