diff --git a/src/wp-content/themes/twentyeleven/functions.php b/src/wp-content/themes/twentyeleven/functions.php
index b70e7130f5..6c248e9f60 100644
--- a/src/wp-content/themes/twentyeleven/functions.php
+++ b/src/wp-content/themes/twentyeleven/functions.php
@@ -294,7 +294,7 @@ endif; // twentyeleven_setup
  */
 function twentyeleven_scripts_styles() {
 	// Theme block stylesheet.
-	wp_enqueue_style( 'twentyeleven-block-style', get_template_directory_uri() . '/blocks.css', array(), '20181230' );
+	wp_enqueue_style( 'twentyeleven-block-style', get_template_directory_uri() . '/blocks.css', array(), '20190102' );
 }
 add_action( 'wp_enqueue_scripts', 'twentyeleven_scripts_styles' );
 
@@ -305,7 +305,7 @@ add_action( 'wp_enqueue_scripts', 'twentyeleven_scripts_styles' );
  */
 function twentyeleven_block_editor_styles() {
 	// Block styles.
-	wp_enqueue_style( 'twentyeleven-block-editor-style', get_template_directory_uri() . '/editor-blocks.css', array(), '20181230' );
+	wp_enqueue_style( 'twentyeleven-block-editor-style', get_template_directory_uri() . '/editor-blocks.css', array(), '20190102' );
 }
 add_action( 'enqueue_block_editor_assets', 'twentyeleven_block_editor_styles' );
 
diff --git a/src/wp-content/themes/twentyeleven/header.php b/src/wp-content/themes/twentyeleven/header.php
index 34a31806bf..e6ce35302d 100644
--- a/src/wp-content/themes/twentyeleven/header.php
+++ b/src/wp-content/themes/twentyeleven/header.php
@@ -49,7 +49,7 @@ if ( ( $paged >= 2 || $page >= 2 ) && ! is_404() ) {
 ?>
 	</title>
 <link rel="profile" href="http://gmpg.org/xfn/11" />
-<link rel="stylesheet" type="text/css" media="all" href="<?php bloginfo( 'stylesheet_url' ); ?>" />
+<link rel="stylesheet" type="text/css" media="all" href="<?php bloginfo( 'stylesheet_url' ); ?>?ver=20190507" />
 <link rel="pingback" href="<?php echo esc_url( get_bloginfo( 'pingback_url' ) ); ?>">
 <!--[if lt IE 9]>
 <script src="<?php echo get_template_directory_uri(); ?>/js/html5.js" type="text/javascript"></script>
diff --git a/src/wp-content/themes/twentyeleven/inc/theme-options.php b/src/wp-content/themes/twentyeleven/inc/theme-options.php
index 98e6f0970c..e2ac9d3d0f 100644
--- a/src/wp-content/themes/twentyeleven/inc/theme-options.php
+++ b/src/wp-content/themes/twentyeleven/inc/theme-options.php
@@ -17,7 +17,7 @@
  * @param string $hook_suffix An admin page's hook suffix.
  */
 function twentyeleven_admin_enqueue_scripts( $hook_suffix ) {
-	wp_enqueue_style( 'twentyeleven-theme-options', get_template_directory_uri() . '/inc/theme-options.css', false, '2011-04-28' );
+	wp_enqueue_style( 'twentyeleven-theme-options', get_template_directory_uri() . '/inc/theme-options.css', false, '20110602' );
 	wp_enqueue_script( 'twentyeleven-theme-options', get_template_directory_uri() . '/inc/theme-options.js', array( 'farbtastic' ), '2011-06-10' );
 	wp_enqueue_style( 'farbtastic' );
 }
@@ -419,7 +419,7 @@ function twentyeleven_enqueue_color_scheme() {
 	$color_scheme = $options['color_scheme'];
 
 	if ( 'dark' == $color_scheme ) {
-		wp_enqueue_style( 'dark', get_template_directory_uri() . '/colors/dark.css', array(), null );
+		wp_enqueue_style( 'dark', get_template_directory_uri() . '/colors/dark.css', array(), '20190404' );
 	}
 
 	/**
diff --git a/src/wp-content/themes/twentyfifteen/functions.php b/src/wp-content/themes/twentyfifteen/functions.php
index 189a15cde9..77ec92b194 100644
--- a/src/wp-content/themes/twentyfifteen/functions.php
+++ b/src/wp-content/themes/twentyfifteen/functions.php
@@ -368,17 +368,17 @@ function twentyfifteen_scripts() {
 	wp_enqueue_style( 'genericons', get_template_directory_uri() . '/genericons/genericons.css', array(), '3.2' );
 
 	// Load our main stylesheet.
-	wp_enqueue_style( 'twentyfifteen-style', get_stylesheet_uri() );
+	wp_enqueue_style( 'twentyfifteen-style', get_stylesheet_uri(), array(), '20190507' );
 
 	// Theme block stylesheet.
-	wp_enqueue_style( 'twentyfifteen-block-style', get_template_directory_uri() . '/css/blocks.css', array( 'twentyfifteen-style' ), '20181230' );
+	wp_enqueue_style( 'twentyfifteen-block-style', get_template_directory_uri() . '/css/blocks.css', array( 'twentyfifteen-style' ), '20190102' );
 
 	// Load the Internet Explorer specific stylesheet.
-	wp_enqueue_style( 'twentyfifteen-ie', get_template_directory_uri() . '/css/ie.css', array( 'twentyfifteen-style' ), '20141010' );
+	wp_enqueue_style( 'twentyfifteen-ie', get_template_directory_uri() . '/css/ie.css', array( 'twentyfifteen-style' ), '20170916' );
 	wp_style_add_data( 'twentyfifteen-ie', 'conditional', 'lt IE 9' );
 
 	// Load the Internet Explorer 7 specific stylesheet.
-	wp_enqueue_style( 'twentyfifteen-ie7', get_template_directory_uri() . '/css/ie7.css', array( 'twentyfifteen-style' ), '20141010' );
+	wp_enqueue_style( 'twentyfifteen-ie7', get_template_directory_uri() . '/css/ie7.css', array( 'twentyfifteen-style' ), '20141210' );
 	wp_style_add_data( 'twentyfifteen-ie7', 'conditional', 'lt IE 8' );
 
 	wp_enqueue_script( 'twentyfifteen-skip-link-focus-fix', get_template_directory_uri() . '/js/skip-link-focus-fix.js', array(), '20141010', true );
@@ -410,7 +410,7 @@ add_action( 'wp_enqueue_scripts', 'twentyfifteen_scripts' );
  */
 function twentyfifteen_block_editor_styles() {
 	// Block styles.
-	wp_enqueue_style( 'twentyfifteen-block-editor-style', get_template_directory_uri() . '/css/editor-blocks.css', array(), '20181230' );
+	wp_enqueue_style( 'twentyfifteen-block-editor-style', get_template_directory_uri() . '/css/editor-blocks.css', array(), '20190102' );
 	// Add custom fonts.
 	wp_enqueue_style( 'twentyfifteen-fonts', twentyfifteen_fonts_url(), array(), null );
 }
diff --git a/src/wp-content/themes/twentyfourteen/functions.php b/src/wp-content/themes/twentyfourteen/functions.php
index 42a8129b2b..afed98fafc 100644
--- a/src/wp-content/themes/twentyfourteen/functions.php
+++ b/src/wp-content/themes/twentyfourteen/functions.php
@@ -317,13 +317,13 @@ function twentyfourteen_scripts() {
 	wp_enqueue_style( 'genericons', get_template_directory_uri() . '/genericons/genericons.css', array(), '3.0.3' );
 
 	// Load our main stylesheet.
-	wp_enqueue_style( 'twentyfourteen-style', get_stylesheet_uri() );
+	wp_enqueue_style( 'twentyfourteen-style', get_stylesheet_uri(), array(), '20190507' );
 
 	// Theme block stylesheet.
-	wp_enqueue_style( 'twentyfourteen-block-style', get_template_directory_uri() . '/css/blocks.css', array( 'twentyfourteen-style' ), '20181230' );
+	wp_enqueue_style( 'twentyfourteen-block-style', get_template_directory_uri() . '/css/blocks.css', array( 'twentyfourteen-style' ), '20190102' );
 
 	// Load the Internet Explorer specific stylesheet.
-	wp_enqueue_style( 'twentyfourteen-ie', get_template_directory_uri() . '/css/ie.css', array( 'twentyfourteen-style' ), '20131205' );
+	wp_enqueue_style( 'twentyfourteen-ie', get_template_directory_uri() . '/css/ie.css', array( 'twentyfourteen-style' ), '20140701' );
 	wp_style_add_data( 'twentyfourteen-ie', 'conditional', 'lt IE 9' );
 
 	if ( is_singular() && comments_open() && get_option( 'thread_comments' ) ) {
@@ -396,7 +396,7 @@ add_filter( 'wp_resource_hints', 'twentyfourteen_resource_hints', 10, 2 );
  */
 function twentyfourteen_block_editor_styles() {
 	// Block styles.
-	wp_enqueue_style( 'twentyfourteen-block-editor-style', get_template_directory_uri() . '/css/editor-blocks.css', array(), '20181230' );
+	wp_enqueue_style( 'twentyfourteen-block-editor-style', get_template_directory_uri() . '/css/editor-blocks.css', array(), '20190102' );
 	// Add custom fonts.
 	wp_enqueue_style( 'twentyfourteen-fonts', twentyfourteen_font_url(), array(), null );
 }
diff --git a/src/wp-content/themes/twentyseventeen/functions.php b/src/wp-content/themes/twentyseventeen/functions.php
index 34cad0bbc3..d1077ebd43 100644
--- a/src/wp-content/themes/twentyseventeen/functions.php
+++ b/src/wp-content/themes/twentyseventeen/functions.php
@@ -447,24 +447,24 @@ function twentyseventeen_scripts() {
 	wp_enqueue_style( 'twentyseventeen-fonts', twentyseventeen_fonts_url(), array(), null );
 
 	// Theme stylesheet.
-	wp_enqueue_style( 'twentyseventeen-style', get_stylesheet_uri() );
+	wp_enqueue_style( 'twentyseventeen-style', get_stylesheet_uri(), array(), '20190507' );
 
 	// Theme block stylesheet.
-	wp_enqueue_style( 'twentyseventeen-block-style', get_theme_file_uri( '/assets/css/blocks.css' ), array( 'twentyseventeen-style' ), '1.1' );
+	wp_enqueue_style( 'twentyseventeen-block-style', get_theme_file_uri( '/assets/css/blocks.css' ), array( 'twentyseventeen-style' ), '20190105' );
 
 	// Load the dark colorscheme.
 	if ( 'dark' === get_theme_mod( 'colorscheme', 'light' ) || is_customize_preview() ) {
-		wp_enqueue_style( 'twentyseventeen-colors-dark', get_theme_file_uri( '/assets/css/colors-dark.css' ), array( 'twentyseventeen-style' ), '1.0' );
+		wp_enqueue_style( 'twentyseventeen-colors-dark', get_theme_file_uri( '/assets/css/colors-dark.css' ), array( 'twentyseventeen-style' ), '20190408' );
 	}
 
 	// Load the Internet Explorer 9 specific stylesheet, to fix display issues in the Customizer.
 	if ( is_customize_preview() ) {
-		wp_enqueue_style( 'twentyseventeen-ie9', get_theme_file_uri( '/assets/css/ie9.css' ), array( 'twentyseventeen-style' ), '1.0' );
+		wp_enqueue_style( 'twentyseventeen-ie9', get_theme_file_uri( '/assets/css/ie9.css' ), array( 'twentyseventeen-style' ), '20161202' );
 		wp_style_add_data( 'twentyseventeen-ie9', 'conditional', 'IE 9' );
 	}
 
 	// Load the Internet Explorer 8 specific stylesheet.
-	wp_enqueue_style( 'twentyseventeen-ie8', get_theme_file_uri( '/assets/css/ie8.css' ), array( 'twentyseventeen-style' ), '1.0' );
+	wp_enqueue_style( 'twentyseventeen-ie8', get_theme_file_uri( '/assets/css/ie8.css' ), array( 'twentyseventeen-style' ), '20161202' );
 	wp_style_add_data( 'twentyseventeen-ie8', 'conditional', 'lt IE 9' );
 
 	// Load the html5 shiv.
@@ -508,7 +508,7 @@ add_action( 'wp_enqueue_scripts', 'twentyseventeen_scripts' );
  */
 function twentyseventeen_block_editor_styles() {
 	// Block styles.
-	wp_enqueue_style( 'twentyseventeen-block-editor-style', get_theme_file_uri( '/assets/css/editor-blocks.css' ), array(), '1.1' );
+	wp_enqueue_style( 'twentyseventeen-block-editor-style', get_theme_file_uri( '/assets/css/editor-blocks.css' ), array(), '20190328' );
 	// Add custom fonts.
 	wp_enqueue_style( 'twentyseventeen-fonts', twentyseventeen_fonts_url(), array(), null );
 }
diff --git a/src/wp-content/themes/twentysixteen/functions.php b/src/wp-content/themes/twentysixteen/functions.php
index ce5f399b1f..f4d42926ac 100644
--- a/src/wp-content/themes/twentysixteen/functions.php
+++ b/src/wp-content/themes/twentysixteen/functions.php
@@ -368,21 +368,21 @@ function twentysixteen_scripts() {
 	wp_enqueue_style( 'genericons', get_template_directory_uri() . '/genericons/genericons.css', array(), '3.4.1' );
 
 	// Theme stylesheet.
-	wp_enqueue_style( 'twentysixteen-style', get_stylesheet_uri() );
+	wp_enqueue_style( 'twentysixteen-style', get_stylesheet_uri(), array(), '20190507' );
 
 	// Theme block stylesheet.
-	wp_enqueue_style( 'twentysixteen-block-style', get_template_directory_uri() . '/css/blocks.css', array( 'twentysixteen-style' ), '20181230' );
+	wp_enqueue_style( 'twentysixteen-block-style', get_template_directory_uri() . '/css/blocks.css', array( 'twentysixteen-style' ), '20190102' );
 
 	// Load the Internet Explorer specific stylesheet.
-	wp_enqueue_style( 'twentysixteen-ie', get_template_directory_uri() . '/css/ie.css', array( 'twentysixteen-style' ), '20160816' );
+	wp_enqueue_style( 'twentysixteen-ie', get_template_directory_uri() . '/css/ie.css', array( 'twentysixteen-style' ), '20170530' );
 	wp_style_add_data( 'twentysixteen-ie', 'conditional', 'lt IE 10' );
 
 	// Load the Internet Explorer 8 specific stylesheet.
-	wp_enqueue_style( 'twentysixteen-ie8', get_template_directory_uri() . '/css/ie8.css', array( 'twentysixteen-style' ), '20160816' );
+	wp_enqueue_style( 'twentysixteen-ie8', get_template_directory_uri() . '/css/ie8.css', array( 'twentysixteen-style' ), '20170530' );
 	wp_style_add_data( 'twentysixteen-ie8', 'conditional', 'lt IE 9' );
 
 	// Load the Internet Explorer 7 specific stylesheet.
-	wp_enqueue_style( 'twentysixteen-ie7', get_template_directory_uri() . '/css/ie7.css', array( 'twentysixteen-style' ), '20160816' );
+	wp_enqueue_style( 'twentysixteen-ie7', get_template_directory_uri() . '/css/ie7.css', array( 'twentysixteen-style' ), '20170530' );
 	wp_style_add_data( 'twentysixteen-ie7', 'conditional', 'lt IE 8' );
 
 	// Load the html5 shiv.
@@ -419,7 +419,7 @@ add_action( 'wp_enqueue_scripts', 'twentysixteen_scripts' );
  */
 function twentysixteen_block_editor_styles() {
 	// Block styles.
-	wp_enqueue_style( 'twentysixteen-block-editor-style', get_template_directory_uri() . '/css/editor-blocks.css', array(), '20181230' );
+	wp_enqueue_style( 'twentysixteen-block-editor-style', get_template_directory_uri() . '/css/editor-blocks.css', array(), '20190102' );
 	// Add custom fonts.
 	wp_enqueue_style( 'twentysixteen-fonts', twentysixteen_fonts_url(), array(), null );
 }
diff --git a/src/wp-content/themes/twentyten/functions.php b/src/wp-content/themes/twentyten/functions.php
index b2035c9e40..cae6a6f42a 100644
--- a/src/wp-content/themes/twentyten/functions.php
+++ b/src/wp-content/themes/twentyten/functions.php
@@ -711,7 +711,7 @@ add_filter( 'widget_tag_cloud_args', 'twentyten_widget_tag_cloud_args' );
  */
 function twentyten_scripts_styles() {
 	// Theme block stylesheet.
-	wp_enqueue_style( 'twentyten-block-style', get_template_directory_uri() . '/blocks.css', array(), '20181018' );
+	wp_enqueue_style( 'twentyten-block-style', get_template_directory_uri() . '/blocks.css', array(), '20181218' );
 }
 add_action( 'wp_enqueue_scripts', 'twentyten_scripts_styles' );
 
@@ -722,7 +722,7 @@ add_action( 'wp_enqueue_scripts', 'twentyten_scripts_styles' );
  */
 function twentyten_block_editor_styles() {
 	// Block styles.
-	wp_enqueue_style( 'twentyten-block-editor-style', get_template_directory_uri() . '/editor-blocks.css' );
+	wp_enqueue_style( 'twentyten-block-editor-style', get_template_directory_uri() . '/editor-blocks.css', array(), '20181218' );
 }
 add_action( 'enqueue_block_editor_assets', 'twentyten_block_editor_styles' );
 
diff --git a/src/wp-content/themes/twentyten/header.php b/src/wp-content/themes/twentyten/header.php
index 06ecaca1c8..bbd9f0fb51 100644
--- a/src/wp-content/themes/twentyten/header.php
+++ b/src/wp-content/themes/twentyten/header.php
@@ -39,7 +39,7 @@ if ( ( $paged >= 2 || $page >= 2 ) && ! is_404() ) {
 ?>
 	</title>
 <link rel="profile" href="http://gmpg.org/xfn/11" />
-<link rel="stylesheet" type="text/css" media="all" href="<?php bloginfo( 'stylesheet_url' ); ?>" />
+<link rel="stylesheet" type="text/css" media="all" href="<?php bloginfo( 'stylesheet_url' ); ?>?ver=20190507" />
 <link rel="pingback" href="<?php echo esc_url( get_bloginfo( 'pingback_url' ) ); ?>">
 <?php
 	/*
diff --git a/src/wp-content/themes/twentythirteen/functions.php b/src/wp-content/themes/twentythirteen/functions.php
index a6ec2a7533..99ff24071d 100644
--- a/src/wp-content/themes/twentythirteen/functions.php
+++ b/src/wp-content/themes/twentythirteen/functions.php
@@ -282,13 +282,13 @@ function twentythirteen_scripts_styles() {
 	wp_enqueue_style( 'genericons', get_template_directory_uri() . '/genericons/genericons.css', array(), '3.0.3' );
 
 	// Loads our main stylesheet.
-	wp_enqueue_style( 'twentythirteen-style', get_stylesheet_uri(), array(), '2013-07-18' );
+	wp_enqueue_style( 'twentythirteen-style', get_stylesheet_uri(), array(), '20190507' );
 
 	// Theme block stylesheet.
-	wp_enqueue_style( 'twentythirteen-block-style', get_template_directory_uri() . '/css/blocks.css', array( 'twentythirteen-style' ), '2018-12-30' );
+	wp_enqueue_style( 'twentythirteen-block-style', get_template_directory_uri() . '/css/blocks.css', array( 'twentythirteen-style' ), '20190102' );
 
 	// Loads the Internet Explorer specific stylesheet.
-	wp_enqueue_style( 'twentythirteen-ie', get_template_directory_uri() . '/css/ie.css', array( 'twentythirteen-style' ), '2013-07-18' );
+	wp_enqueue_style( 'twentythirteen-ie', get_template_directory_uri() . '/css/ie.css', array( 'twentythirteen-style' ), '20150214' );
 	wp_style_add_data( 'twentythirteen-ie', 'conditional', 'lt IE 9' );
 }
 add_action( 'wp_enqueue_scripts', 'twentythirteen_scripts_styles' );
@@ -325,7 +325,7 @@ add_filter( 'wp_resource_hints', 'twentythirteen_resource_hints', 10, 2 );
  */
 function twentythirteen_block_editor_styles() {
 	// Block styles.
-	wp_enqueue_style( 'twentythirteen-block-editor-style', get_template_directory_uri() . '/css/editor-blocks.css', array(), '2018-12-30' );
+	wp_enqueue_style( 'twentythirteen-block-editor-style', get_template_directory_uri() . '/css/editor-blocks.css', array(), '20190102' );
 	// Add custom fonts.
 	wp_enqueue_style( 'twentythirteen-fonts', twentythirteen_fonts_url(), array(), null );
 }
diff --git a/src/wp-content/themes/twentytwelve/functions.php b/src/wp-content/themes/twentytwelve/functions.php
index 80a6e997b3..18efd16d70 100644
--- a/src/wp-content/themes/twentytwelve/functions.php
+++ b/src/wp-content/themes/twentytwelve/functions.php
@@ -200,13 +200,13 @@ function twentytwelve_scripts_styles() {
 	}
 
 	// Loads our main stylesheet.
-	wp_enqueue_style( 'twentytwelve-style', get_stylesheet_uri() );
+	wp_enqueue_style( 'twentytwelve-style', get_stylesheet_uri(), array(), '20190507' );
 
 	// Theme block stylesheet.
-	wp_enqueue_style( 'twentytwelve-block-style', get_template_directory_uri() . '/css/blocks.css', array( 'twentytwelve-style' ), '20181230' );
+	wp_enqueue_style( 'twentytwelve-block-style', get_template_directory_uri() . '/css/blocks.css', array( 'twentytwelve-style' ), '20190406' );
 
 	// Loads the Internet Explorer specific stylesheet.
-	wp_enqueue_style( 'twentytwelve-ie', get_template_directory_uri() . '/css/ie.css', array( 'twentytwelve-style' ), '20121010' );
+	wp_enqueue_style( 'twentytwelve-ie', get_template_directory_uri() . '/css/ie.css', array( 'twentytwelve-style' ), '20150214' );
 	$wp_styles->add_data( 'twentytwelve-ie', 'conditional', 'lt IE 9' );
 }
 add_action( 'wp_enqueue_scripts', 'twentytwelve_scripts_styles' );
@@ -218,7 +218,7 @@ add_action( 'wp_enqueue_scripts', 'twentytwelve_scripts_styles' );
  */
 function twentytwelve_block_editor_styles() {
 	// Block styles.
-	wp_enqueue_style( 'twentytwelve-block-editor-style', get_template_directory_uri() . '/css/editor-blocks.css', array(), '20181230' );
+	wp_enqueue_style( 'twentytwelve-block-editor-style', get_template_directory_uri() . '/css/editor-blocks.css', array(), '20190406' );
 	// Add custom fonts.
 	wp_enqueue_style( 'twentytwelve-fonts', twentytwelve_get_font_url(), array(), null );
 }