diff --git a/xCAT-server/sbin/xcatconfig b/xCAT-server/sbin/xcatconfig
index 1d3652d92..2ce6e0951 100755
--- a/xCAT-server/sbin/xcatconfig
+++ b/xCAT-server/sbin/xcatconfig
@@ -1206,6 +1206,7 @@ sub initDB
         $chtabcmds .= "$::XCATROOT/sbin/chtab key=cleanupxcatpost site.value=no;";
         $chtabcmds .= "$::XCATROOT/sbin/chtab key=dhcplease site.value=43200;";
         $chtabcmds .= "$::XCATROOT/sbin/chtab key=auditnosyslog site.value=0;";
+        $chtabcmds .= "$::XCATROOT/sbin/chtab key=xcatsslversion site.value=;";
         $chtabcmds .= "$::XCATROOT/sbin/chtab key=auditskipcmds site.value=ALL;";
 
         #$chtabcmds .= "$::XCATROOT/sbin/chtab key=useflowcontrol site.value=yes;"; # need to fix 4031
@@ -1471,6 +1472,15 @@ sub initDB
                 xCAT::MsgUtils->message('E', "Could not set ddns as dnshandler.");
             }
         }
+
+        # Set default value for site.xcatsslversion when update xcat
+        $cmds = "XCATBYPASS=Y $::XCATROOT/sbin/tabdump site 2>/dev/null | grep xcatsslversion";
+        xCAT::Utils->runcmd("$cmds", -1);
+        if ($::RUNCMD_RC == 0) {
+            verbose("+-+-+-+-+-+-+-+ The default value of site.xcatsslversion was updated.");
+            verbose("|W|A|R|N|I|N|G| Run `chdef -t site xcatsslversion=' to update your system to");
+            verbose("+-+-+-+-+-+-+-+ the new default value. See `man site' for more details");
+        }
     }
 
     # remove xcatserver,xcatclient