diff --git a/wp-content/themes/twentyfourteen/functions.php b/wp-content/themes/twentyfourteen/functions.php
index e8fccddaa9..bc6bf1315f 100644
--- a/wp-content/themes/twentyfourteen/functions.php
+++ b/wp-content/themes/twentyfourteen/functions.php
@@ -34,6 +34,12 @@
 if ( ! isset( $content_width ) )
 	$content_width = 474;
 
+/**
+ * Twenty Fourteen only works in WordPress 3.6 or later.
+ */
+if ( version_compare( $GLOBALS['wp_version'], '3.6', '<' ) )
+	require get_template_directory() . '/inc/back-compat.php';
+
 if ( ! function_exists( 'twentyfourteen_setup' ) ) :
 /**
  * Twenty Fourteen setup.
@@ -217,8 +223,6 @@ function twentyfourteen_font_url() {
  * @return void
  */
 function twentyfourteen_scripts() {
-	global $wp_styles;
-
 	// Add Lato font, used in the main stylesheet.
 	wp_enqueue_style( 'twentyfourteen-lato', twentyfourteen_font_url(), array(), null );
 
@@ -230,7 +234,7 @@ function twentyfourteen_scripts() {
 
 	// Load the Internet Explorer specific stylesheet.
 	wp_enqueue_style( 'twentyfourteen-ie', get_template_directory_uri() . '/css/ie.css', array( 'twentyfourteen-style' ), '20131110' );
-	$wp_styles->add_data( 'twentyfourteen-ie', 'conditional', 'lt IE 9' );
+	wp_style_add_data( 'twentyfourteen-ie', 'conditional', 'lt IE 9' );
 
 	if ( is_singular() && comments_open() && get_option( 'thread_comments' ) )
 		wp_enqueue_script( 'comment-reply' );
diff --git a/wp-content/themes/twentyfourteen/inc/back-compat.php b/wp-content/themes/twentyfourteen/inc/back-compat.php
new file mode 100644
index 0000000000..dc1ace9cc5
--- /dev/null
+++ b/wp-content/themes/twentyfourteen/inc/back-compat.php
@@ -0,0 +1,71 @@
+<?php
+/**
+ * Twenty Fourteen back compat functionality
+ *
+ * Prevents Twenty Fourteen from running on WordPress versions prior to 3.6,
+ * since this theme is not meant to be backward compatible beyond that
+ * and relies on many newer functions and markup changes introduced in 3.6.
+ *
+ * @package WordPress
+ * @subpackage Twenty_Fourteen
+ * @since Twenty Fourteen 1.0
+ */
+
+/**
+ * Prevent switching to Twenty Fourteen on old versions of WordPress.
+ *
+ * Switches to the default theme.
+ *
+ * @since Twenty Fourteen 1.0
+ *
+ * @return void
+ */
+function twentyfourteen_switch_theme() {
+	switch_theme( WP_DEFAULT_THEME, WP_DEFAULT_THEME );
+	unset( $_GET['activated'] );
+	add_action( 'admin_notices', 'twentyfourteen_upgrade_notice' );
+}
+add_action( 'after_switch_theme', 'twentyfourteen_switch_theme' );
+
+/**
+ * Add message for unsuccessful theme switch.
+ *
+ * Prints an update nag after an unsuccessful attempt to switch to
+ * Twenty Fourteen on WordPress versions prior to 3.6.
+ *
+ * @since Twenty Fourteen 1.0
+ *
+ * @return void
+ */
+function twentyfourteen_upgrade_notice() {
+	$message = sprintf( __( 'Twenty Fourteen requires at least WordPress version 3.6. You are running version %s. Please upgrade and try again.', 'twentyfourteen' ), $GLOBALS['wp_version'] );
+	printf( '<div class="error"><p>%s</p></div>', $message );
+}
+
+/**
+ * Prevent the Theme Customizer from being loaded on WordPress versions prior to 3.6.
+ *
+ * @since Twenty Fourteen 1.0
+ *
+ * @return void
+ */
+function twentyfourteen_customize() {
+	wp_die( sprintf( __( 'Twenty Fourteen requires at least WordPress version 3.6. You are running version %s. Please upgrade and try again.', 'twentyfourteen' ), $GLOBALS['wp_version'] ), '', array(
+		'back_link' => true,
+	) );
+}
+add_action( 'load-customize.php', 'twentyfourteen_customize' );
+
+/**
+ * Prevent the Theme Preview from being loaded on WordPress versions prior to 3.4.
+ *
+ * @since Twenty Fourteen 1.0
+ *
+ * @return void
+ */
+function twentyfourteen_preview() {
+	if ( isset( $_GET['preview'] ) ) {
+		wp_die( sprintf( __( 'Twenty Fourteen requires at least WordPress version 3.6. You are running version %s. Please upgrade and try again.', 'twentyfourteen' ), $GLOBALS['wp_version'] ) );
+	}
+}
+add_action( 'template_redirect', 'twentyfourteen_preview' );
diff --git a/wp-content/themes/twentyfourteen/inc/widgets.php b/wp-content/themes/twentyfourteen/inc/widgets.php
index e1d6754a50..4999285bef 100644
--- a/wp-content/themes/twentyfourteen/inc/widgets.php
+++ b/wp-content/themes/twentyfourteen/inc/widgets.php
@@ -131,22 +131,14 @@ class Twenty_Fourteen_Ephemera_Widget extends WP_Widget {
 								else :
 									$images = array();
 
-									if ( function_exists( 'get_post_galleries' ) ) {
-										$galleries = get_post_galleries( get_the_ID(), false );
-										if ( isset( $galleries[0]['ids'] ) )
-											$images = explode( ',', $galleries[0]['ids'] );
-									} else {
-										$pattern = get_shortcode_regex();
-										preg_match( "/$pattern/s", get_the_content(), $match );
-										$atts = shortcode_parse_atts( $match[3] );
-										if ( isset( $atts['ids'] ) )
-											$images = explode( ',', $atts['ids'] );
-									}
+									$galleries = get_post_galleries( get_the_ID(), false );
+									if ( isset( $galleries[0]['ids'] ) )
+										$images = explode( ',', $galleries[0]['ids'] );
 
 									if ( ! $images ) :
 										$images = get_posts( array(
 											'fields'         => 'ids',
-											'numberposts'    => 999,
+											'numberposts'    => -1,
 											'order'          => 'ASC',
 											'orderby'        => 'menu_order',
 											'post_mime_type' => 'image',
@@ -166,19 +158,17 @@ class Twenty_Fourteen_Ephemera_Widget extends WP_Widget {
 
 									if ( ! empty ( $post_thumbnail ) ) :
 						?>
-									<a href="<?php the_permalink(); ?>"><?php echo $post_thumbnail; ?></a>
-								<?php
-									endif;
-								?>
-									<p class="wp-caption-text">
-									<?php
-										printf( _n( 'This gallery contains <a href="%1$s" rel="bookmark">%2$s photo</a>.', 'This gallery contains <a href="%1$s" rel="bookmark">%2$s photos</a>.', $total_images, 'twentyfourteen' ),
-											esc_url( get_permalink() ),
-											number_format_i18n( $total_images )
-										);
-									?>
-									</p>
+						<a href="<?php the_permalink(); ?>"><?php echo $post_thumbnail; ?></a>
+						<?php endif; ?>
+						<p class="wp-caption-text">
 							<?php
+								printf( _n( 'This gallery contains <a href="%1$s" rel="bookmark">%2$s photo</a>.', 'This gallery contains <a href="%1$s" rel="bookmark">%2$s photos</a>.', $total_images, 'twentyfourteen' ),
+									esc_url( get_permalink() ),
+									number_format_i18n( $total_images )
+								);
+							?>
+						</p>
+						<?php
 								endif;
 
 							else :