diff --git a/.gitignore b/.gitignore
index 76442ee..f325114 100644
--- a/.gitignore
+++ b/.gitignore
@@ -36,3 +36,4 @@ clog
 /roundcubemail-1.4.10-complete.tar.gz
 /roundcubemail-1.4.11-complete.tar.gz
 /roundcubemail-1.5-beta-complete.tar.gz
+/roundcubemail-1.5-rc-complete.tar.gz
diff --git a/roundcubemail.spec b/roundcubemail.spec
index 2455185..70b6444 100644
--- a/roundcubemail.spec
+++ b/roundcubemail.spec
@@ -11,7 +11,7 @@
 # support for apache / nginx / php-fpm
 %global with_phpfpm 1
 %global upstream_version     1.5
-%global upstream_prever      beta
+%global upstream_prever      rc
 
 %global roundcubedir %{_datadir}/roundcubemail
 %global _logdir /var/log  
@@ -50,9 +50,9 @@ BuildRequires: php-cli
 BuildRequires: php-pear(PEAR)            >= 1.10.1
 BuildRequires: php-pear(Auth_SASL)       >= 1.1.0
 BuildRequires: php-pear(Mail_Mime)       >= 1.10.0
-BuildRequires: php-pear(Net_SMTP)        >= 1.9.0
+BuildRequires: php-pear(Net_SMTP)        >= 1.10.0
 BuildRequires: php-pear(Crypt_GPG)       >= 1.6.0
-BuildRequires: php-pear(Net_Sieve)       >= 1.4.3
+BuildRequires: php-pear(Net_Sieve)       >= 1.4.5
 BuildRequires: php-pear(Net_LDAP2)       >= 2.2.0
 BuildRequires: php-composer(kolab/net_ldap3) >= 1.1.1
 BuildRequires: php-composer(fedora/autoloader)
@@ -95,9 +95,9 @@ Requires: php-xml
 #        "pear/pear-core-minimal": "~1.10.1",
 #        "pear/auth_sasl": "~1.1.0",
 #        "pear/mail_mime": "~1.10.0",
-#        "pear/net_smtp": "~1.9.0",
+#        "pear/net_smtp": "~1.10.0",
 #        "pear/crypt_gpg": "~1.6.0",
-#        "pear/net_sieve": "~1.4.3",
+#        "pear/net_sieve": "~1.4.5",
 #        "roundcube/plugin-installer": "~0.1.6",
 #        "masterminds/html5": "~2.7.0",
 #        "endroid/qrcode": "~1.6.5"
@@ -254,7 +254,7 @@ popd
 
 # clean up the buildroot
 rm -r %{buildroot}%{roundcubedir}/{config,logs,temp}
-rm -r %{buildroot}%{roundcubedir}/{CHANGELOG,INSTALL,LICENSE,README.md,UPGRADING}
+rm -r %{buildroot}%{roundcubedir}/{CHANGELOG.md,INSTALL,LICENSE,README.md,UPGRADING}
 rm    %{buildroot}%{roundcubedir}/composer.json-dist
 
 
@@ -288,7 +288,7 @@ fi
 
 %files
 %license LICENSE
-%doc CHANGELOG INSTALL README.md UPGRADING README-rpm.txt
+%doc CHANGELOG.md INSTALL README.md UPGRADING README-rpm.txt
 %doc composer.json-dist
 %{roundcubedir}
 %dir %{_sysconfdir}/%{name}
@@ -314,6 +314,11 @@ fi
 
 
 %changelog
+* Mon Jul  5 2021 Remi Collet <remi@remirepo.net> - 1.5~rc-1
+- update to 1.5-rc
+- raise dependency on pear/net_smtp 1.10
+- raise dependency on pear/net_sieve 1.4.5
+
 * Thu Apr 22 2021 Remi Collet <remi@remirepo.net> - 1.5~beta-1
 - update to 1.5-beta
 - drop dependency on pear/net_idna2
diff --git a/sources b/sources
index 083f8e8..de8910f 100644
--- a/sources
+++ b/sources
@@ -1,2 +1 @@
-SHA512 (roundcubemail-1.4.11-complete.tar.gz) = 2bfe0ff3716f76bf9eb5bf5f7b62c738b233c57e67d6ac767c044d1a3a694ae003642d9cc68a18d6f6ba94135aa7ee1692db920e9127128669faee9ddf78fe80
-SHA512 (roundcubemail-1.5-beta-complete.tar.gz) = 343e2ca2da7e7fd22008f00ed38f94fe2347a6d8ecc057927db3f5ab0b60746455983e2ee5243a8c4967ecbca3615eef3d223981edcca24bad8886b1b93673cd
+SHA512 (roundcubemail-1.5-rc-complete.tar.gz) = 4e49e91bb53546e6ac348e33e64019afeee2ce6b78caa4375148fc6fac5abbe8e5db42670c5527e3678abe838ddf349275353e7919584d751bf4c321a62fe795