diff --git a/readme.html b/readme.html
index 8ed9f00348..70645cbbbf 100644
--- a/readme.html
+++ b/readme.html
@@ -9,7 +9,7 @@
 <body>
 <h1 id="logo">
 	<a href="https://wordpress.org/"><img alt="WordPress" src="wp-admin/images/wordpress-logo.png" /></a>
-	<br /> Version 4.3.8
+	<br /> Version 4.3.9
 </h1>
 <p style="text-align: center">Semantic Personal Publishing Platform</p>
 
diff --git a/wp-admin/about.php b/wp-admin/about.php
index de50962728..1f13585388 100644
--- a/wp-admin/about.php
+++ b/wp-admin/about.php
@@ -108,7 +108,11 @@ $tech_features = array(
 		</h2>
 
 		<div class="changelog point-releases">
-			<h3><?php echo _n( 'Maintenance and Security Release', 'Maintenance and Security Releases', 8 ); ?></h3>
+			<h3><?php echo _n( 'Maintenance and Security Release', 'Maintenance and Security Releases', 9 ); ?></h3>
+			<p><?php printf( _n( '<strong>Version %1$s</strong> addressed a security issue.',
+					'<strong>Version %1$s</strong> addressed some security issues.', 6 ), '4.3.9' ); ?>
+				<?php printf( __( 'For more information, see <a href="%s">the release notes</a>.' ), 'https://codex.wordpress.org/Version_4.3.9' ); ?>
+			</p>
 			<p><?php printf( _n( '<strong>Version %1$s</strong> addressed a security issue.',
 					'<strong>Version %1$s</strong> addressed some security issues.', 3 ), '4.3.8' ); ?>
 				<?php printf( __( 'For more information, see <a href="%s">the release notes</a>.' ), 'https://codex.wordpress.org/Version_4.3.8' ); ?>
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 5f6f5f1529..e607a2c0db 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.3.8';
+$wp_version = '4.3.9';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.
