diff --git a/src/wp-admin/includes/deprecated.php b/src/wp-admin/includes/deprecated.php
index 5b1a199713..b912d7d5cf 100644
--- a/src/wp-admin/includes/deprecated.php
+++ b/src/wp-admin/includes/deprecated.php
@@ -1053,3 +1053,66 @@ function wp_create_thumbnail( $file, $max_side, $deprecated = '' ) {
 function wp_nav_menu_locations_meta_box() {
 	_deprecated_function( __FUNCTION__, '3.6' );	
 }
+
+/**
+ * This was once used to kick-off the Core Updater.
+ *
+ * Deprecated in favor of instantating a Core_Upgrader instance directly,
+ * and calling the 'upgrade' method.
+ *
+ * @since 2.7.0
+ * @deprecated 3.7.0
+ */
+function wp_update_core($current, $feedback = '') {
+	_deprecated_function( __FUNCTION__, '3.7', 'new Core_Upgrader();' );
+
+	if ( !empty($feedback) )
+		add_filter('update_feedback', $feedback);
+
+	include ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
+	$upgrader = new Core_Upgrader();
+	return $upgrader->upgrade($current);
+
+}
+
+/**
+ * This was once used to kick-off the Plugin Updater.
+ *
+ * Deprecated in favor of instantating a Plugin_Upgrader instance directly,
+ * and calling the 'upgrade' method.
+ * Unused since 2.8.0.
+ *
+ * @since 2.5.0
+ * @deprecated 3.7.0
+ */
+function wp_update_plugin($plugin, $feedback = '') {
+	_deprecated_function( __FUNCTION__, '3.7', 'new Plugin_Upgrader();' );
+
+	if ( !empty($feedback) )
+		add_filter('update_feedback', $feedback);
+
+	include ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
+	$upgrader = new Plugin_Upgrader();
+	return $upgrader->upgrade($plugin);
+}
+
+/**
+ * This was once used to kick-off the Plugin Updater.
+ *
+ * Deprecated in favor of instantating a Plugin_Upgrader instance directly,
+ * and calling the 'upgrade' method.
+ * Unused since 2.8.0.
+ *
+ * @since 2.7.0
+ * @deprecated 3.7.0
+ */
+function wp_update_theme($theme, $feedback = '') {
+	_deprecated_function( __FUNCTION__, '3.7', 'new Theme_Upgrader();' );
+
+	if ( !empty($feedback) )
+		add_filter('update_feedback', $feedback);
+
+	include ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
+	$upgrader = new Theme_Upgrader();
+	return $upgrader->upgrade($theme);
+}
diff --git a/src/wp-admin/includes/update-core.php b/src/wp-admin/includes/update-core.php
index 2b458a53d8..a97f6a004f 100644
--- a/src/wp-admin/includes/update-core.php
+++ b/src/wp-admin/includes/update-core.php
@@ -873,7 +873,7 @@ function _redirect_to_about_wordpress( $new_version ) {
 	if ( version_compare( $wp_version, '3.4-RC1', '>=' ) )
 		return;
 
-	// Ensure we only run this on the update-core.php page. wp_update_core() could be called in other contexts.
+	// Ensure we only run this on the update-core.php page. The Core_Upgrader may be used in other contexts.
 	if ( 'update-core.php' != $pagenow )
 		return;
 
diff --git a/src/wp-admin/includes/update.php b/src/wp-admin/includes/update.php
index 00ebbc447f..a39bddac00 100644
--- a/src/wp-admin/includes/update.php
+++ b/src/wp-admin/includes/update.php
@@ -6,8 +6,6 @@
  * @subpackage Administration
  */
 
-// The admin side of our 1.1 update system
-
 /**
  * Selects the first update version from the update_core option
  *
@@ -220,15 +218,6 @@ function wp_plugin_update_row( $file, $plugin_data ) {
 	}
 }
 
-function wp_update_plugin($plugin, $feedback = '') {
-	if ( !empty($feedback) )
-		add_filter('update_feedback', $feedback);
-
-	include ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
-	$upgrader = new Plugin_Upgrader();
-	return $upgrader->upgrade($plugin);
-}
-
 function get_theme_updates() {
 	$themes = wp_get_themes();
 	$current = get_site_transient('update_themes');
@@ -245,15 +234,6 @@ function get_theme_updates() {
 	return $update_themes;
 }
 
-function wp_update_theme($theme, $feedback = '') {
-	if ( !empty($feedback) )
-		add_filter('update_feedback', $feedback);
-
-	include ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
-	$upgrader = new Theme_Upgrader();
-	return $upgrader->upgrade($theme);
-}
-
 function wp_theme_update_rows() {
 	if ( !current_user_can('update_themes' ) )
 		return;
@@ -294,16 +274,6 @@ function wp_theme_update_row( $theme_key, $theme ) {
 	echo '</div></td></tr>';
 }
 
-function wp_update_core($current, $feedback = '') {
-	if ( !empty($feedback) )
-		add_filter('update_feedback', $feedback);
-
-	include ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
-	$upgrader = new Core_Upgrader();
-	return $upgrader->upgrade($current);
-
-}
-
 function maintenance_nag() {
 	global $upgrading;
 	if ( ! isset( $upgrading ) )
diff --git a/src/wp-admin/update-core.php b/src/wp-admin/update-core.php
index 1bd6f6945a..e1dac44f06 100644
--- a/src/wp-admin/update-core.php
+++ b/src/wp-admin/update-core.php
@@ -314,6 +314,8 @@ function list_theme_updates() {
 function do_core_upgrade( $reinstall = false ) {
 	global $wp_filesystem;
 
+	include_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
+
 	if ( $reinstall )
 		$url = 'update-core.php?action=do-core-reinstall';
 	else
@@ -347,7 +349,10 @@ function do_core_upgrade( $reinstall = false ) {
 	if ( $reinstall )
 		$update->response = 'reinstall';
 
-	$result = wp_update_core($update, 'show_message');
+	add_filter( 'update_feedback', 'show_message' );
+
+	$upgrader = new Core_Upgrader();
+	$result = $upgrader->upgrade( $update );
 
 	if ( is_wp_error($result) ) {
 		show_message($result);