--- a/cubicweb.spec	Mon Mar 20 09:40:24 2017 +0100
+++ b/cubicweb.spec	Mon Mar 20 16:51:41 2017 +0100
@@ -25,7 +25,7 @@
 Requires:       %{python}-logilab-common >= 1.2.2
 Requires:       %{python}-logilab-mtconverter >= 0.8.0
 Requires:       %{python}-rql >= 0.34.0
-Requires:       %{python}-yams >= 0.44.0
+Requires:       %{python}-yams >= 0.44.0, %{python}-yams < 0.45.0
 Requires:       %{python}-logilab-database >= 1.15.0
 Requires:       %{python}-passlib < 2.0
 Requires:       %{python}-lxml