diff --git a/perl-xCAT/perl-xCAT.spec b/perl-xCAT/perl-xCAT.spec
index 113c8f5ba..b022ae884 100644
--- a/perl-xCAT/perl-xCAT.spec
+++ b/perl-xCAT/perl-xCAT.spec
@@ -2,7 +2,7 @@ Summary: xCAT perl libraries
 Name: perl-xCAT
 Version: 2.1
 Release: snap%(date +"%Y%m%d%H%M")
-Epoch: 2
+Epoch: 4
 License: EPL
 Group: System Environment/Libraries
 Source: perl-xCAT-2.1.tar.gz
diff --git a/xCAT-client/xCAT-client.spec b/xCAT-client/xCAT-client.spec
index 74f373a56..774ead920 100644
--- a/xCAT-client/xCAT-client.spec
+++ b/xCAT-client/xCAT-client.spec
@@ -2,7 +2,7 @@ Summary: Core executables and data of the xCAT management project
 Name: xCAT-client
 Version: 2.1
 Release: snap%(date +"%Y%m%d%H%M")
-Epoch: 2
+Epoch: 4
 License: EPL
 Group: Applications/System
 Source: xCAT-client-2.1.tar.gz
diff --git a/xCAT-nbroot/xcat-core-nbroot.spec b/xCAT-nbroot/xcat-core-nbroot.spec
index 4cfb606f7..5887a8475 100644
--- a/xCAT-nbroot/xcat-core-nbroot.spec
+++ b/xCAT-nbroot/xcat-core-nbroot.spec
@@ -1,4 +1,3 @@
-%define epoch   0
 %define version	2.1
 %ifarch i386 i586 i686 x86
 %define tarch x86
@@ -12,7 +11,7 @@
 BuildArch: noarch
 %define name	xCAT-nbroot-core-%{tarch}
 Release: snap%(date +"%Y%m%d%H%M")
-Epoch: 2
+Epoch: 4
 AutoReq: false
 Prefix: /opt/xcat
 AutoProv: false
@@ -23,7 +22,6 @@ AutoProv: false
 
 
 Name:	 %{name}
-#Epoch:   %{epoch}
 Version: %{version}
 Group: System/Utilities
 License: EPL
diff --git a/xCAT-rmc/xCAT-rmc.spec b/xCAT-rmc/xCAT-rmc.spec
index ed1ddf548..656ee794a 100644
--- a/xCAT-rmc/xCAT-rmc.spec
+++ b/xCAT-rmc/xCAT-rmc.spec
@@ -2,7 +2,7 @@ Summary: RMC monitoring plug-in for xCAT
 Name: xCAT-rmc
 Version: 2.1
 Release: snap%(date +"%Y%m%d%H%M")
-Epoch: 2
+Epoch: 4
 License: EPL
 Group: System Environment/Libraries
 Source: xCAT-rmc-2.1.tar.gz
diff --git a/xCAT-server/xCAT-server.spec b/xCAT-server/xCAT-server.spec
index e5a5f36d3..e70ee6a1c 100644
--- a/xCAT-server/xCAT-server.spec
+++ b/xCAT-server/xCAT-server.spec
@@ -2,7 +2,7 @@ Summary: Server and configuration utilities of the xCAT management project
 Name: xCAT-server
 Version: 2.1
 Release: snap%(date +"%Y%m%d%H%M")
-Epoch: 2
+Epoch: 4
 License: EPL
 Group: Applications/System
 Source: xCAT-server-2.1.tar.gz
diff --git a/xCAT-web/xCAT-web.spec b/xCAT-web/xCAT-web.spec
index 369166e41..c9d414a87 100644
--- a/xCAT-web/xCAT-web.spec
+++ b/xCAT-web/xCAT-web.spec
@@ -2,7 +2,7 @@ Summary: Web Interface for xCAT
 Name: xCAT-web
 Version: 2.1
 Release: snap%(date +"%Y%m%d%H%M")
-Epoch: 2
+Epoch: 4
 
 License: EPL
 Group: Applications/System
diff --git a/xCAT/xCAT.spec b/xCAT/xCAT.spec
index 758312d0b..6620c5c3d 100644
--- a/xCAT/xCAT.spec
+++ b/xCAT/xCAT.spec
@@ -2,7 +2,7 @@ Summary: Metapackage for a common, default xCAT setup
 Name: xCAT
 Version: 2.1
 Release: snap%(date +"%Y%m%d%H%M")
-Epoch: 2
+Epoch: 4
 License: EPL
 Group: Applications/System
 Vendor: IBM Corp.
diff --git a/xCATsn/xCATsn.spec b/xCATsn/xCATsn.spec
index 597aa1606..bebca4d4e 100644
--- a/xCATsn/xCATsn.spec
+++ b/xCATsn/xCATsn.spec
@@ -2,7 +2,7 @@ Summary: Metapackage for a common, default xCAT service node setup
 Name: xCATsn
 Version: 2.1
 Release: snap%(date +"%Y%m%d%H%M")
-Epoch: 2
+Epoch: 4
 License: EPL
 Group: Applications/System
 Vendor: IBM Corp.