--- a/cubicweb.spec	Tue Mar 15 16:58:50 2016 +0100
+++ b/cubicweb.spec	Wed Mar 16 10:06:18 2016 +0100
@@ -29,7 +29,7 @@
 Requires:       %{python}-logilab-database >= 1.15.0
 Requires:       %{python}-passlib
 Requires:       %{python}-lxml
-Requires:       %{python}-twisted-web
+Requires:       %{python}-twisted-web << 16.0.0
 Requires:       %{python}-markdown
 Requires:       pytz
 # the schema view uses `dot'; at least on el5, png output requires graphviz-gd