diff --git a/package.json b/package.json
index 38392efd6a..a33971dedd 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "WordPress",
-  "version": "4.4.20",
+  "version": "4.4.21",
   "description": "WordPress is web software you can use to create a beautiful website or blog.",
   "repository": {
     "type": "svn",
diff --git a/src/wp-admin/about.php b/src/wp-admin/about.php
index 07d7164648..a7838ab14c 100644
--- a/src/wp-admin/about.php
+++ b/src/wp-admin/about.php
@@ -50,6 +50,26 @@ include( ABSPATH . 'wp-admin/admin-header.php' );
 
 		<div class="changelog point-releases">
 			<h3><?php _e( 'Maintenance and Security Releases' ); ?> </h3>
+			<p>
+				<?php
+				printf(
+					/* translators: %s: WordPress version number */
+					__( '<strong>Version %s</strong> addressed one security issue.' ),
+					'4.4.21'
+				);
+				?>
+				<?php
+				printf(
+					/* translators: %s: HelpHub URL */
+					__( 'For more information, see <a href="%s">the release notes</a>.' ),
+					sprintf(
+						/* translators: %s: WordPress version */
+						esc_url( __( 'https://wordpress.org/support/wordpress-version/version-%s/' ) ),
+						sanitize_title( '4.4.21' )
+					)
+				);
+				?>
+			</p>
 			<p>
 				<?php
 				printf(
diff --git a/src/wp-includes/version.php b/src/wp-includes/version.php
index da7788a36b..dc79a2e128 100644
--- a/src/wp-includes/version.php
+++ b/src/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4.20-src';
+$wp_version = '4.4.21-src';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.