diff --git a/ipasserelle-groupware.spec b/ipasserelle-groupware.spec
index f46131d..5e4a917 100644
--- a/ipasserelle-groupware.spec
+++ b/ipasserelle-groupware.spec
@@ -1,4 +1,4 @@
-%define version 0.2.20
+%define version 0.2.21
 %define release 1
 %define name ipasserelle-groupware
 %define debug_package %{nil}
@@ -12,7 +12,7 @@ License: GPLv3+
 URL: http://www.ipasserelle.com
 Source0: %{name}-%{version}.tar.gz
 
-BuildRoot: %(mktemp -ud %{_tmppath}/%{name}-%{version}-%{release}-XXXXXX)
+BuildRoot: /var/tmp/%{name}-%{version}-%{release}-buildroot
 
 BuildRequires: e-smith-devtools
 BuildRequires: gcc
@@ -38,6 +38,10 @@ iPasserelle module for the groupware application.
 Based on smeserver-sogo from nethesis
 
 %changelog
+%changelog
+* Wed Jan 21 2015 Daniel Berteaud <daniel@firewall-services.com> - 0.2.21-1
+- Make dovecot's auth_cache last as long as sogo's memcached
+
 * Wed Jan 7 2015 Daniel Berteaud <daniel@firewall-services.com> - 0.2.20-1
 - Enable dovecot auth_cache
 - Enable IMAP pooling to reduce auth against dovecot