diff --git a/CHANGELOG b/CHANGELOG
index 647c405..a13478e 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -3,6 +3,7 @@
 ======================
 Version    Description
 
+1.0.17......Display container release version, ability to upgrade/downgrade container base.
 1.0.16......Enable logging on error.
 1.0.15......Ability to restore .tgz archives on ZFS, be more verbose.
 1.0.14......Destroy ZFS dataset before rename.
diff --git a/bastille-init b/bastille-init
index be93149..6ddca46 100755
--- a/bastille-init
+++ b/bastille-init
@@ -75,7 +75,8 @@ BATSILLE_URL="https://github.com/BastilleBSD/${APPNAME}/archive/${BRANCH}.zip" #
 BASTILE_VERSION="https://raw.githubusercontent.com/BastilleBSD/${APPNAME}/${BRANCH}/usr/local/bin/${APPNAME}"
 GITURL="https://github.com/JRGTH/xigmanas-${APPNAME}-extension/archive/${BRANCH}.zip"
 VERFILE="https://raw.githubusercontent.com/JRGTH/xigmanas-${APPNAME}-extension/${BRANCH}/version"
-ARG="$2"
+OPT="${1}"
+NAME="${2}"
 
 # Required
 if [ -f "${BASTILLECONF}" ]; then
@@ -488,7 +489,7 @@ jail_backup()
 	# Backup container on request.
 	ZFS_COMPRESS=$(sysrc -f ${CWDIR}${EXTCONF} -qn ZFS_COMPRESS)
 	ZFS_SENDPARAMS=$(sysrc -f ${CWDIR}${EXTCONF} -qn ZFS_SENDPARAMS)
-	JAIL_NAME="${ARG}"
+	JAIL_NAME="${NAME}"
 	DATE=$(date +%Y-%m-%d-%H%M%S)
 	EXCLUDE="--exclude=.bastille --exclude=.template"
 	if [ -n "${JAIL_NAME}" ]; then
@@ -528,7 +529,7 @@ jail_restore()
 	# Restore container on request.
 	ZFS_DECOMPRESS=$(sysrc -f ${CWDIR}${EXTCONF} -qn ZFS_DECOMPRESS)
 	ZFS_RECVPARAM=$(sysrc -f ${CWDIR}${EXTCONF} -qn ZFS_RECVPARAM)
-	BACKUP_FILE="${ARG}"
+	BACKUP_FILE="${NAME}"
 	NAME_TRIM=$(echo ${BACKUP_FILE} | awk '{print $1}' | grep -o '[^/]*$' | cut -d '-' -f1)
 	FILE_EXT=$(echo ${BACKUP_FILE} | awk '{print $1}' | grep -o '[^/]*$' | cut -d '.' -f2)
 	if [ -f "${CWDIR}/backups/${BACKUP_FILE}" ]; then
@@ -583,6 +584,61 @@ jail_restore()
 	fi	
 }
 
+jail_osrelease()
+{
+	# Verify user input and handle some errors.
+	if [ -d "${bastille_jailsdir}/${NAME}" ]; then
+		if [ -d "${bastille_releasesdir}/${RELEASE}" ]; then
+			if [ -f "${bastille_releasesdir}/${RELEASE}/COPYRIGHT" ]; then
+				if [ -d "${bastille_releasesdir}/${NEWRELEASE}" ]; then
+					if [ -f "${bastille_releasesdir}/${NEWRELEASE}/COPYRIGHT" ]; then
+						if [ -f "${bastille_jailsdir}/${NAME}/fstab" ]; then
+							# Check if the container is running.
+							if [ $(jls name | grep -w "${NAME}") ]; then
+								echo -e "Jail running."
+								echo -e "See 'bastille stop ${NAME}'."
+								exit 1
+							elif [ "${RELEASE}" = "${NEWRELEASE}" ]; then
+								echo -e "Specified releases name match."
+								exit 0
+							fi
+							# Check if is a thin container.
+							if cat "${bastille_jailsdir}/${NAME}/fstab" | grep "${RELEASE}" | grep -q ".bastille"; then
+								# If the previous conditions meets, proceed with the container fstab edit.
+								sed -i '' "s/${RELEASE}/${NEWRELEASE}/g" ${bastille_jailsdir}/${NAME}/fstab
+								echo -e "${NAME} release changed to ${NEWRELEASE}."
+							elif cat "${bastille_jailsdir}/${NAME}/fstab" | grep "${NEWRELEASE}" | grep -q ".bastille"; then
+								echo -e "${NAME} already using ${NEWRELEASE}."
+							else
+								echo -e "${NAME} is not a thin container."
+								exit 1
+							fi
+						else
+							echo -e "${NAME} fstab not found."
+							exit 1
+						fi
+					else
+						echo -e "Unknown ${NEWRELEASE}. See bootstrap."
+						exit 1
+					fi
+				else
+					echo -e "${NEWRELEASE} not found. See bootstrap."
+					exit 1
+				fi
+			else
+				echo -e "Unknown ${RELEASE}. See bootstrap."
+			fi
+		else
+			echo -e "${RELEASE} not found. See bootstrap."
+			exit 1
+		fi
+	else
+		echo -e "${NAME} not found. See create."
+		exit 1
+	fi
+	exit 0
+}
+
 zfs_activate()
 {
 	# Check if ZFS is already configured.
@@ -911,6 +967,20 @@ bastille_init()
 # Run-time configuration.
 runtime_config
 
+# Handle additional commands.
+case "${OPT}" in
+osrelease|--osrelease)
+	if [ $# -gt 4 ] || [ $# -lt 4 ]; then
+		echo "Usage: ${SCRIPTNAME} [osrelease|--osrelease] [container] [release] [newrelease]"
+		exit 1
+	fi
+	NAME="${2}"
+	RELEASE="${3}"
+	NEWRELEASE="${4}"
+	jail_osrelease
+	;;
+esac
+
 while getopts ":ospruxUvgtBRZh" option; do
 	case ${option} in
 		[h]) echo "Usage: ${SCRIPTNAME} -[option] | [container]";
@@ -927,7 +997,11 @@ while getopts ":ospruxUvgtBRZh" option; do
 		echo "        -Z  Activate ZFS for ${PRDNAME} Extension."
 		echo "        -x  Reset ${PRDNAME}/Extension config."
 		echo "        -U  Uninstall ${PRDNAME} (Extension files only)."
-		echo "        -h  Display this help message."; exit 0;;
+		echo "        -h  Display this help message."
+		echo
+		echo "Advanced Usage: ${SCRIPTNAME} [option] [container] [argument1] [argument2]"
+		echo "Options:"
+		echo "        osrelease|--osrelease  Quickly upgrade/downgrade a thin container base release."; exit 0;;
 		[o]) OBI_INSTALL="ON";; # To prevent nested PHP-CGI call for installation with OBI.
 		[s]) bastille_start;;
 		[p]) bastille_stop;;
diff --git a/gui/bastille_manager-lib.inc b/gui/bastille_manager-lib.inc
index e505e77..37d3126 100755
--- a/gui/bastille_manager-lib.inc
+++ b/gui/bastille_manager-lib.inc
@@ -127,6 +127,20 @@ function get_all_interface_list() {
 	return $iflist;
 }
 
+//	list base releases
+$a_release = get_all_release_list();
+$l_release = [];
+foreach($a_release as $k_release => $release):
+	$l_release[$k_release] = $k_release;
+endforeach;
+
+//	list of configured interfaces
+$a_interface = get_all_interface_list();
+$l_interfaces = [];
+foreach($a_interface as $k_interface => $ifinfo):
+	$l_interfaces[$k_interface] = $k_interface;
+endforeach;
+
 // Get jail infos.
 function get_jail_infos() {
 	global $img_path;
@@ -163,6 +177,11 @@ function get_jail_infos() {
 		if (!$r['ip']):
 			$r['ip'] = "-";
 		endif;
+		// Display release.
+		$r['rel'] = exec("/usr/sbin/jexec {$item} freebsd-version 2>/dev/null");
+		if (!$r['rel']):
+			$r['rel'] = "-";
+		endif;
 		// Display interfaces.
 		$r['nic'] = exec("/usr/bin/grep -w 'interface' {$jail_dir}/{$item}/jail.conf | /usr/bin/awk '{print $3}' | /usr/bin/tr -d ';'");
 		if (!$r['nic']):
diff --git a/gui/bastille_manager_add.php b/gui/bastille_manager_add.php
index c5ef637..ec8761a 100644
--- a/gui/bastille_manager_add.php
+++ b/gui/bastille_manager_add.php
@@ -48,20 +48,6 @@ if(!$pconfig['ipaddress']):
 	$pconfig['ipaddress'] = '';
 endif;
 
-//	list of configured interfaces
-$a_interface = get_all_interface_list();
-$l_interfaces = [];
-foreach($a_interface as $k_interface => $ifinfo):
-	$l_interfaces[$k_interface] = $k_interface;
-endforeach;
-
-//	list base releases
-$a_release = get_all_release_list();
-$l_release = [];
-foreach($a_release as $k_release => $release):
-	$l_release[$k_release] = $k_release;
-endforeach;
-
 if(!get_all_release_list()):
 	$errormsg = gtext('No base releases extracted yet.')
 			. ' '
diff --git a/gui/bastille_manager_gui.php b/gui/bastille_manager_gui.php
index fac3b48..d1a095f 100644
--- a/gui/bastille_manager_gui.php
+++ b/gui/bastille_manager_gui.php
@@ -241,6 +241,7 @@ $document->render();
 			<col style="width:5%">
 			<col style="width:10%">
 			<col style="width:10%">
+			<col style="width:10%">
 			<col style="width:5%">
 			<col style="width:25%">
 			<col style="width:5%">
@@ -251,13 +252,14 @@ $document->render();
 		<thead>
 <?php
 			html_separator2();
-			html_titleline2(gettext('Overview'), 10);
+			html_titleline2(gettext('Overview'), 11);
 ?>
 			<tr>
 				<th class="lhelc"><?=gtext('Select');?></th>
 				<th class="lhell"><?=gtext('JID');?></th>
 				<th class="lhell"><?=gtext('IPv4 Address');?></th>
 				<th class="lhell"><?=gtext('Hostname');?></th>
+				<th class="lhell"><?=gtext('Release');?></th>
 				<th class="lhell"><?=gtext('Interface');?></th>
 				<th class="lhell"><?=gtext('Path');?></th>
 				<th class="lhell"><?=gtext('Boot');?></th>
@@ -290,6 +292,7 @@ $document->render();
 					<td class="lcell"><?=htmlspecialchars($sphere_record['id']);?>&nbsp;</td>
 					<td class="lcell"><?=htmlspecialchars($sphere_record['ip']);?>&nbsp;</td>
 					<td class="lcell"><?=htmlspecialchars($sphere_record['name']);?>&nbsp;</td>
+					<td class="lcell"><?=htmlspecialchars($sphere_record['rel']);?>&nbsp;</td>
 					<td class="lcell"><?=htmlspecialchars($sphere_record['nic']);?>&nbsp;</td>
 					<td class="lcell"><?=htmlspecialchars($sphere_record['path']);?>&nbsp;</td>
 					<td class="lcell"><img src="<?=$sphere_record['boot'];?>"></td>
@@ -331,7 +334,7 @@ $document->render();
 		</tbody>
 		<tfoot>
 			<tr>
-				<td class="lcenl" colspan="9"></td>
+				<td class="lcenl" colspan="10"></td>
 				<td class="lceadd">
 					<a href="bastille_manager_add.php"><img src="<?=$img_path['add'];?>" title="<?=$gt_record_add;?>" border="0" alt="<?=$gt_record_add;?>" class="spin oneemhigh"/></a>
 				</td>
diff --git a/gui/bastille_manager_tarballs.php b/gui/bastille_manager_tarballs.php
index 1a1c864..9e333ed 100644
--- a/gui/bastille_manager_tarballs.php
+++ b/gui/bastille_manager_tarballs.php
@@ -205,8 +205,10 @@ $document->render();
 		</colgroup>
 		<thead>
 <?php
-			if (!is_dir_empty($reldir)):
-				html_titleline2(gettext('FreeBSD Base Release Installed'));
+			if (is_dir($reldir)):
+				if (!is_dir_empty($reldir)):
+					html_titleline2(gettext('FreeBSD Base Release Installed'));
+				endif;
 			endif;
 			foreach ($sphere_array as $sphere_record):
 			if (file_exists("{$reldir}/{$sphere_record['relname']}/root/.profile")):
diff --git a/gui/bastille_manager_util.php b/gui/bastille_manager_util.php
index 2e404be..227b506 100644
--- a/gui/bastille_manager_util.php
+++ b/gui/bastille_manager_util.php
@@ -128,6 +128,34 @@ if($_POST):
 				endif;
 				break;
 
+			case 'base':
+				// Input validation not required
+				if(empty($input_errors)):
+					$container = [];
+					$container['uuid'] = $_POST['uuid'];
+					$container['jailname'] = $_POST['jailname'];
+					$item = $container['jailname'];
+					$current_release = exec("/usr/bin/grep '\-RELEASE' {$jail_dir}/{$item}/fstab | awk '{print $1}' | grep -o '[^/]*$'");
+					$new_release = $pconfig['release'];
+
+					if(!$current_release):
+						$savemsg .= gtext("Base release change disabled for thick containers.");
+					else:
+						$cmd = ("/usr/local/sbin/bastille-init --osrelease {$item} {$current_release} {$new_release}");
+						unset($output,$retval);mwexec2($cmd,$output,$retval);
+						if($retval == 0):
+							$savemsg .= sprintf(gtext("Container base release changed to %s successfully."),$new_release);
+							exec("echo '{$date}: {$application}: Container base release changed to {$new_release} on {$item} successfully' >> {$logfile}");
+							//header('Location: bastille_manager_gui.php');
+							//exit;
+						else:
+							$errormsg .= sprintf(gtext("Failed to change container base release to %s, either it is running or is not a thin container."),$new_release);
+							exec("echo '{$date}: {$application}: Failed to change container base release to {$new_release} on {$item}' >> {$logfile}");
+						endif;
+					endif;
+				endif;
+				break;
+
 			case 'autoboot':
 				// Input validation not required
 				if(empty($input_errors)):
@@ -253,6 +281,8 @@ function action_change() {
 	showElementById('advanced_tr', 'hide');
 	showElementById('readonly_tr', 'hide');
 	showElementById('createdir_tr', 'hide');
+	showElementById('jail_release_tr', 'hide');
+	showElementById('release_tr','hide');
 	//showElementById('dateadd_tr','hide');
 	var action = document.iform.action.value;
 	switch (action) {
@@ -260,6 +290,14 @@ function action_change() {
 			showElementById('confirmname_tr','hide');
 			showElementById('nowstop_tr','hide');
 			break;
+			
+		case "base":
+			showElementById('confirmname_tr','hide');
+			showElementById('nowstop_tr','hide');
+			showElementById('jail_release_tr', 'show');
+			showElementById('release_tr','show');
+			break;
+		
 		case "autoboot":
 			showElementById('confirmname_tr','hide');
 			showElementById('nowstop_tr','hide');
@@ -329,11 +367,23 @@ $document->render();
 		</thead>
 		<tbody>
 <?php
+			$b_action = $l_release;
+			#$current_release = exec("/usr/sbin/jexec {$pconfig['jailname']} freebsd-version 2>/dev/null");
+			unset($disable_base_change);
+			$current_release = exec("/usr/bin/grep '\-RELEASE' {$jail_dir}/{$pconfig['jailname']}/fstab | awk '{print $1}' | grep -o '[^/]*$'");
+			if (!$current_release):
+				$current_release = exec("/usr/bin/grep 'releng' {$jail_dir}/{$pconfig['jailname']}/root/COPYRIGHT | cut -d '/' -f2");
+				$disable_base_change = "1";
+				if (!$current_release):
+					$current_release = "-";
+				endif;
+			endif;
 			$pconfig['source_path'] = "/mnt";
 			$pconfig['target_path'] = "{$rootfolder}/jails/{$pconfig['jailname']}/root/mnt/";
 			html_text2('jailname',gettext('Container name:'),htmlspecialchars($pconfig['jailname']));
 			$a_action = [
 				'backup' => gettext('Backup'),
+				'base' => gettext('Release'),
 				'autoboot' => gettext('Autoboot'),
 				'noauto' => gettext('Noauto'),
 				'fstab' => gettext('Fstab'),
@@ -348,6 +398,10 @@ $document->render();
 			html_checkbox2('advanced',gettext('Advanced jail configuration Files'),!empty($pconfig['advanced']) ? true : false,gettext('I understand the risks, take me to the advanced jail config files.'),'',true);
 			html_checkbox2('readonly',gettext('Read-Only Mode'),!empty($pconfig['readonly']) ? true : false,gettext('Set target directory in Read-Only mode.'),'',false);
 			html_checkbox2('createdir',gettext('Create Target Directory'),!empty($pconfig['createdir']) ? true : true,gettext('Create target directory if missing (recommended).'),'',true);
+			html_text2('jail_release',gettext('Current base release:'),htmlspecialchars($current_release));
+			if (!$disable_base_change):
+				html_combobox2('release',gettext('New base release'),$pconfig['release'],$b_action,gettext("Warning: this will change current base to the selected base on the thin container only, the user is responsible for package updates and/or general incompatibilities issues."),true,false,);
+			endif;
 			//html_checkbox2('dateadd',gettext('Date'),!empty($pconfig['dateadd']) ? true : false,gettext('Append the date in the following format: ITEM-XXXX-XX-XX-XXXXXX.'),'',false);
 ?>
 		</tbody>
diff --git a/version b/version
index b668c3b..8fc77d0 100644
--- a/version
+++ b/version
@@ -1 +1 @@
-1.0.16
+1.0.17