diff --git a/functions.php b/functions.php
index 16678312..453e6d28 100644
--- a/functions.php
+++ b/functions.php
@@ -116,9 +116,9 @@ add_action( 'widgets_init', '_s_widgets_init' );
 function _s_scripts() {
 	wp_enqueue_style( '_s-style', get_stylesheet_uri() );
 
-	wp_enqueue_script( '_s-navigation', get_template_directory_uri() . '/js/navigation.js', array(), '20120206', true );
+	wp_enqueue_script( '_s-navigation', get_template_directory_uri() . '/js/navigation.js', array(), '20151215', true );
 
-	wp_enqueue_script( '_s-skip-link-focus-fix', get_template_directory_uri() . '/js/skip-link-focus-fix.js', array(), '20130115', true );
+	wp_enqueue_script( '_s-skip-link-focus-fix', get_template_directory_uri() . '/js/skip-link-focus-fix.js', array(), '20151215', true );
 
 	if ( is_singular() && comments_open() && get_option( 'thread_comments' ) ) {
 		wp_enqueue_script( 'comment-reply' );
diff --git a/inc/customizer.php b/inc/customizer.php
index 3f531c54..77be9483 100644
--- a/inc/customizer.php
+++ b/inc/customizer.php
@@ -21,6 +21,6 @@ add_action( 'customize_register', '_s_customize_register' );
  * Binds JS handlers to make Theme Customizer preview reload changes asynchronously.
  */
 function _s_customize_preview_js() {
-	wp_enqueue_script( '_s_customizer', get_template_directory_uri() . '/js/customizer.js', array( 'customize-preview' ), '20130508', true );
+	wp_enqueue_script( '_s_customizer', get_template_directory_uri() . '/js/customizer.js', array( 'customize-preview' ), '20151215', true );
 }
 add_action( 'customize_preview_init', '_s_customize_preview_js' );