diff --git a/wp-admin/includes/class-wp-upgrader.php b/wp-admin/includes/class-wp-upgrader.php
index 89f966cd60..ff25249a92 100644
--- a/wp-admin/includes/class-wp-upgrader.php
+++ b/wp-admin/includes/class-wp-upgrader.php
@@ -844,6 +844,8 @@ class Plugin_Upgrader extends WP_Upgrader {
 		$this->install_strings();
 
 		add_filter('upgrader_source_selection', array($this, 'check_package') );
+		// Clear cache so wp_update_plugins() knows about the new plugin.
+		add_action( 'upgrader_process_complete', 'wp_clean_plugins_cache', 9, 0 );
 
 		$this->run( array(
 			'package' => $package,
@@ -856,6 +858,7 @@ class Plugin_Upgrader extends WP_Upgrader {
 			)
 		) );
 
+		remove_action( 'upgrader_process_complete', 'wp_clean_plugins_cache', 9 );
 		remove_filter('upgrader_source_selection', array($this, 'check_package') );
 
 		if ( ! $this->result || is_wp_error($this->result) )
@@ -1408,6 +1411,8 @@ class Theme_Upgrader extends WP_Upgrader {
 
 		add_filter('upgrader_source_selection', array($this, 'check_package') );
 		add_filter('upgrader_post_install', array($this, 'check_parent_theme_filter'), 10, 3);
+		// Clear cache so wp_update_themes() knows about the new theme.
+		add_action( 'upgrader_process_complete', 'wp_clean_themes_cache', 9, 0 );
 
 		$this->run( array(
 			'package' => $package,
@@ -1420,6 +1425,7 @@ class Theme_Upgrader extends WP_Upgrader {
 			),
 		) );
 
+		remove_action( 'upgrader_process_complete', 'wp_clean_themes_cache', 9 );
 		remove_filter('upgrader_source_selection', array($this, 'check_package') );
 		remove_filter('upgrader_post_install', array($this, 'check_parent_theme_filter'));
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index d220e42195..9950a76331 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-34750';
+$wp_version = '4.4-alpha-34751';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.