diff --git a/functions.php b/functions.php
index 18efd16d7..814c75f71 100644
--- a/functions.php
+++ b/functions.php
@@ -192,7 +192,7 @@ function twentytwelve_scripts_styles() {
 	}
 
 	// Adds JavaScript for handling the navigation menu hide-and-show behavior.
-	wp_enqueue_script( 'twentytwelve-navigation', get_template_directory_uri() . '/js/navigation.js', array( 'jquery' ), '20140711', true );
+	wp_enqueue_script( 'twentytwelve-navigation', get_template_directory_uri() . '/js/navigation.js', array( 'jquery' ), '20141205', true );
 
 	$font_url = twentytwelve_get_font_url();
 	if ( ! empty( $font_url ) ) {
diff --git a/header.php b/header.php
index f8ff59907..2888cd8ee 100644
--- a/header.php
+++ b/header.php
@@ -26,7 +26,7 @@
 <link rel="pingback" href="<?php echo esc_url( get_bloginfo( 'pingback_url' ) ); ?>">
 <?php // Loads HTML5 JavaScript file to add support for HTML5 elements in older IE versions. ?>
 <!--[if lt IE 9]>
-<script src="<?php echo get_template_directory_uri(); ?>/js/html5.js" type="text/javascript"></script>
+<script src="<?php echo get_template_directory_uri(); ?>/js/html5.js?ver=3.7.0" type="text/javascript"></script>
 <![endif]-->
 <?php wp_head(); ?>
 </head>