diff --git a/change_log.txt b/change_log.txt
index 2601b05..0eba52b 100644
--- a/change_log.txt
+++ b/change_log.txt
@@ -1,3 +1,7 @@
+# 4.5 | 2018-12-19
+   - Fixed new tags not being added when updating existing list member.
+
+
 # 4.4 | 2018-10-29
    - Added support for MailChimp contact tags.
 
diff --git a/class-gf-mailchimp.php b/class-gf-mailchimp.php
index 0e225f4..103c5bd 100644
--- a/class-gf-mailchimp.php
+++ b/class-gf-mailchimp.php
@@ -166,7 +166,7 @@ class GFMailChimp extends GFFeedAddOn {
 	 *
 	 * @since  1.0
 	 * @access protected
-	 * @var    object $api If available, contains an instance of the Mailchimp API library.
+	 * @var    GF_MailChimp_API $api If available, contains an instance of the Mailchimp API library.
 	 */
 	public $api = null;
 
@@ -410,7 +410,7 @@ public function feed_settings_fields() {
 						'tooltip'       => sprintf(
 							'<h6>%s</h6>%s',
 							esc_html__( 'Tags', 'gravityformsmailchimp' ),
-							esc_html__( 'Associate tags to your MailChimp contacts with a comma separated list. (e.g. new lead, Gravity Forms, web source)', 'gravityformsmailchimp' )
+							esc_html__( 'Associate tags to your MailChimp contacts with a comma separated list (e.g. new lead, Gravity Forms, web source). Commas within a merge tag value will be created as a single tag.', 'gravityformsmailchimp' )
 						),
 					),
 					array(
@@ -1194,11 +1194,19 @@ public function process_feed( $feed, $entry, $form ) {
 			'ip_signup'    => rgar( $entry, 'ip' ),
 			'vip'          => rgars( $feed, 'meta/markAsVIP' ) ? true : false,
 			'note'         => rgars( $feed, 'meta/note' ),
+			'tags'         => array(),
 		);
 
+		// Get existing tags.
+		$existing_tags = $member ? wp_list_pluck( $member['tags'], 'name' ) : array();
+
 		// Add tags to subscription.
 		if ( ! empty( $tags ) ) {
-			$subscription['tags'] = $tags;
+			$subscription['tags'] = $member ? array_merge( $existing_tags, $tags ) : $tags;
+			$subscription['tags'] = array_unique( $subscription['tags'] );
+		} else {
+			$subscription['tags'] = $member ? $existing_tags : $subscription['tags'];
+			$subscription['tags'] = array_unique( $subscription['tags'] );
 		}
 
 		// Prepare transaction type for filter.
@@ -1262,6 +1270,13 @@ public function process_feed( $feed, $entry, $form ) {
 			unset( $subscription['vip'] );
 		}
 
+		// Remove tags from subscription object.
+		$tags = $subscription['tags'];
+		unset( $subscription['tags'] );
+		foreach ( $tags as &$tag ) {
+			$tag = array( 'name' => $tag, 'status' => 'active' );
+		}
+
 		// Remove note from the subscription object and process any merge tags.
 		$note = GFCommon::replace_variables( $subscription['note'], $form, $entry, false, true, false, 'text' );
 		unset( $subscription['note'] );
@@ -1289,13 +1304,31 @@ public function process_feed( $feed, $entry, $form ) {
 				$this->log_error( __METHOD__ . '(): Field errors when attempting subscription: ' . print_r( $e->getErrors(), true ) );
 			}
 
-			return;
+			return $entry;
+
+		}
+
+		try {
+
+			// Log the subscriber tags to be added or updated.
+			$this->log_debug( __METHOD__ . "(): Subscriber tags to be {$action}: " . print_r( $tags, true ) );
+
+			// Update tags.
+			$this->api->update_member_tags( $list_id, $subscription['email_address'], $tags );
+
+			// Log that the subscriber tags was added or updated.
+			$this->log_debug( __METHOD__ . "(): Subscriber tags successfully {$action}." );
+
+		} catch ( Exception $e ) {
+
+			// Log that subscription could not be added or updated.
+			$this->add_feed_error( sprintf( esc_html__( 'Unable to add/update subscriber tags: %s', 'gravityformsmailchimp' ), $e->getMessage() ), $feed, $entry, $form );
 
 		}
 
 		if ( ! $note ) {
 			// Abort as there is no note to process.
-			return;
+			return $entry;
 		}
 
 		try {
@@ -1309,7 +1342,7 @@ public function process_feed( $feed, $entry, $form ) {
 			// Log that the note could not be added.
 			$this->add_feed_error( sprintf( esc_html__( 'Unable to add note to subscriber: %s', 'gravityformsmailchimp' ), $e->getMessage() ), $feed, $entry, $form );
 
-			return;
+			return $entry;
 
 		}
 
diff --git a/includes/class-gf-mailchimp-api.php b/includes/class-gf-mailchimp-api.php
index 51ec780..c2db7e8 100644
--- a/includes/class-gf-mailchimp-api.php
+++ b/includes/class-gf-mailchimp-api.php
@@ -54,9 +54,10 @@ public function __construct( $api_key = '' ) {
 	 * @since  4.0
 	 * @access public
 	 *
-	 * @uses GF_MailChimp_API::process_request()
+	 * @uses   GF_MailChimp_API::process_request()
 	 *
 	 * @return array
+	 * @throws GF_MailChimp_Exception|Exception
 	 */
 	public function account_details() {
 
@@ -73,9 +74,10 @@ public function account_details() {
 	 * @param string $list_id     MailChimp list ID.
 	 * @param string $category_id Interest category ID.
 	 *
-	 * @uses GF_MailChimp_API::process_request()
+	 * @uses   GF_MailChimp_API::process_request()
 	 *
 	 * @return array
+	 * @throws GF_MailChimp_Exception|Exception
 	 */
 	public function get_interest_category_interests( $list_id, $category_id ) {
 
@@ -91,9 +93,10 @@ public function get_interest_category_interests( $list_id, $category_id ) {
 	 *
 	 * @param string $list_id MailChimp list ID.
 	 *
-	 * @uses GF_MailChimp_API::process_request()
+	 * @uses   GF_MailChimp_API::process_request()
 	 *
 	 * @return array
+	 * @throws Exception
 	 */
 	public function get_list( $list_id ) {
 
@@ -109,9 +112,10 @@ public function get_list( $list_id ) {
 	 *
 	 * @param array $params List request parameters.
 	 *
-	 * @uses GF_MailChimp_API::process_request()
+	 * @uses   GF_MailChimp_API::process_request()
 	 *
 	 * @return array
+	 * @throws GF_MailChimp_Exception|Exception
 	 */
 	public function get_lists( $params ) {
 
@@ -127,9 +131,10 @@ public function get_lists( $params ) {
 	 *
 	 * @param string $list_id MailChimp list ID.
 	 *
-	 * @uses GF_MailChimp_API::process_request()
+	 * @uses   GF_MailChimp_API::process_request()
 	 *
 	 * @return array
+	 * @throws GF_MailChimp_Exception|Exception
 	 */
 	public function get_list_interest_categories( $list_id ) {
 
@@ -146,9 +151,10 @@ public function get_list_interest_categories( $list_id ) {
 	 * @param string $list_id       MailChimp list ID.
 	 * @param string $email_address Email address.
 	 *
-	 * @uses GF_MailChimp_API::process_request()
+	 * @uses   GF_MailChimp_API::process_request()
 	 *
 	 * @return array
+	 * @throws GF_MailChimp_Exception|Exception
 	 */
 	public function get_list_member( $list_id, $email_address ) {
 
@@ -167,9 +173,10 @@ public function get_list_member( $list_id, $email_address ) {
 	 *
 	 * @param string $list_id MailChimp list ID.
 	 *
-	 * @uses GF_MailChimp_API::process_request()
+	 * @uses   GF_MailChimp_API::process_request()
 	 *
 	 * @return array
+	 * @throws GF_MailChimp_Exception|Exception
 	 */
 	public function get_list_merge_fields( $list_id ) {
 
@@ -187,9 +194,10 @@ public function get_list_merge_fields( $list_id ) {
 	 * @param string $email_address Email address.
 	 * @param array  $subscription  Subscription details.
 	 *
-	 * @uses GF_MailChimp_API::process_request()
+	 * @uses   GF_MailChimp_API::process_request()
 	 *
 	 * @return array
+	 * @throws GF_MailChimp_Exception|Exception
 	 */
 	public function update_list_member( $list_id, $email_address, $subscription ) {
 
@@ -200,6 +208,30 @@ public function update_list_member( $list_id, $email_address, $subscription ) {
 
 	}
 
+	/**
+	 * Update tags for a MailChimp list member.
+	 *
+	 * @since  Unknown
+	 * @access public
+	 *
+	 * @param string $list_id       MailChimp list ID.
+	 * @param string $email_address Email address.
+	 * @param array  $tags          Member tags.
+	 *
+	 * @uses   GF_MailChimp_API::process_request()
+	 *
+	 * @return array
+	 * @throws GF_MailChimp_Exception|Exception
+	 */
+	public function update_member_tags( $list_id, $email_address, $tags ) {
+
+		// Prepare subscriber hash.
+		$subscriber_hash = md5( strtolower( $email_address ) );
+
+		return $this->process_request( 'lists/' . $list_id . '/members/' . $subscriber_hash . '/tags', array( 'tags' => $tags ), 'POST' );
+
+	}
+
 	/**
 	 * Add a note to the MailChimp list member.
 	 *
@@ -210,9 +242,10 @@ public function update_list_member( $list_id, $email_address, $subscription ) {
 	 * @param string $email_address Email address.
 	 * @param string $note          The note to be added to the member.
 	 *
-	 * @uses GF_MailChimp_API::process_request()
+	 * @uses   GF_MailChimp_API::process_request()
 	 *
 	 * @return array
+	 * @throws GF_MailChimp_Exception|Exception
 	 */
 	public function add_member_note( $list_id, $email_address, $note ) {
 
@@ -234,7 +267,7 @@ public function add_member_note( $list_id, $email_address, $note ) {
 	 * @param string $method     Request method. Defaults to GET.
 	 * @param string $return_key Array key from response to return. Defaults to null (return full response).
 	 *
-	 * @throws GF_MailChimp_Exception If API request returns an error, exception is thrown.
+	 * @throws GF_MailChimp_Exception|Exception If API request returns an error, exception is thrown.
 	 *
 	 * @return array
 	 */
@@ -308,7 +341,7 @@ private function process_request( $path = '', $data = array(), $method = 'GET',
 		// Get the response code.
 		$response_code = wp_remote_retrieve_response_code( $response );
 
-		if ( $response_code != 200 ) {
+		if ( ! in_array( $response_code, array( 200, 204 ) ) ) {
 
 			// If status code is set, throw exception.
 			if ( isset( $response['body']['status'] ) && isset( $response['body']['title'] ) ) {
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diff --git a/languages/gravityformsmailchimp-sv_SE.mo b/languages/gravityformsmailchimp-sv_SE.mo
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diff --git a/languages/gravityformsmailchimp-zh_CN.mo b/languages/gravityformsmailchimp-zh_CN.mo
index 9644b4d..2a9db2b 100644
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diff --git a/languages/gravityformsmailchimp.pot b/languages/gravityformsmailchimp.pot
index bfe03c0..c12316d 100644
--- a/languages/gravityformsmailchimp.pot
+++ b/languages/gravityformsmailchimp.pot
@@ -1,9 +1,9 @@
 # Copyright 2009-2018 Rocketgenius, Inc.
 msgid ""
 msgstr ""
-"Project-Id-Version: Gravity Forms MailChimp Add-On 4.4\n"
+"Project-Id-Version: Gravity Forms MailChimp Add-On 4.5\n"
 "Report-Msgid-Bugs-To: https://www.gravtiyforms.com\n"
-"POT-Creation-Date: 2018-10-29 19:28:36+00:00\n"
+"POT-Creation-Date: 2018-12-19 13:46:11+00:00\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=utf-8\n"
 "Content-Transfer-Encoding: 8bit\n"
@@ -109,8 +109,9 @@ msgstr ""
 
 #: class-gf-mailchimp.php:413
 msgid ""
-"Associate tags to your MailChimp contacts with a comma separated list. "
-"(e.g. new lead, Gravity Forms, web source)"
+"Associate tags to your MailChimp contacts with a comma separated list (e.g. "
+"new lead, Gravity Forms, web source). Commas within a merge tag value will "
+"be created as a single tag."
 msgstr ""
 
 #: class-gf-mailchimp.php:420
@@ -172,11 +173,15 @@ msgstr ""
 msgid "Unable to check if email address is already used by a member: %s"
 msgstr ""
 
-#: class-gf-mailchimp.php:1285
+#: class-gf-mailchimp.php:1300
 msgid "Unable to add/update subscriber: %s"
 msgstr ""
 
-#: class-gf-mailchimp.php:1310
+#: class-gf-mailchimp.php:1325
+msgid "Unable to add/update subscriber tags: %s"
+msgstr ""
+
+#: class-gf-mailchimp.php:1343
 msgid "Unable to add note to subscriber: %s"
 msgstr ""
 
diff --git a/mailchimp.php b/mailchimp.php
index 8265cea..570cd37 100644
--- a/mailchimp.php
+++ b/mailchimp.php
@@ -9,7 +9,7 @@
 Plugin Name: Gravity Forms MailChimp Add-On
 Plugin URI: https://www.gravityforms.com
 Description: Integrates Gravity Forms with MailChimp, allowing form submissions to be automatically sent to your MailChimp account
-Version: 4.4
+Version: 4.5
 Author: rocketgenius
 Author URI: https://www.rocketgenius.com
 License: GPL-2.0+
@@ -34,7 +34,7 @@
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  **/
 
-define( 'GF_MAILCHIMP_VERSION', '4.4' );
+define( 'GF_MAILCHIMP_VERSION', '4.5' );
 
 // If Gravity Forms is loaded, bootstrap the Mailchimp Add-On.
 add_action( 'gform_loaded', array( 'GF_MailChimp_Bootstrap', 'load' ), 5 );