Index: wp-admin/upgrade.php
===================================================================
--- wp-admin/upgrade.php	(revision 22458)
+++ wp-admin/upgrade.php	(working copy)
@@ -64,7 +64,7 @@
 
 <h2><?php _e( 'No Update Required' ); ?></h2>
 <p><?php _e( 'Your WordPress database is already up-to-date!' ); ?></p>
-<p class="step"><a class="button button-large" href="<?php echo get_option( 'home' ); ?>/"><?php _e( 'Continue' ); ?></a></p>
+<p class="step"><a class="button button-large button-primary" href="<?php echo get_option( 'home' ); ?>/"><?php _e( 'Continue' ); ?></a></p>
 
 <?php elseif ( !$php_compat || !$mysql_compat ) :
 	if ( !$mysql_compat && !$php_compat )
@@ -84,7 +84,7 @@
 <h2><?php _e( 'Database Update Required' ); ?></h2>
 <p><?php _e( 'WordPress has been updated! Before we send you on your way, we have to update your database to the newest version.' ); ?></p>
 <p><?php _e( 'The update process may take a little while, so please be patient.' ); ?></p>
-<p class="step"><a class="button button-large" href="upgrade.php?step=1&amp;backto=<?php echo $goback; ?>"><?php _e( 'Update WordPress Database' ); ?></a></p>
+<p class="step"><a class="button button-large button-primary" href="upgrade.php?step=1&amp;backto=<?php echo $goback; ?>"><?php _e( 'Update WordPress Database' ); ?></a></p>
 <?php
 		break;
 	case 1:
@@ -96,7 +96,7 @@
 ?>
 <h2><?php _e( 'Update Complete' ); ?></h2>
 	<p><?php _e( 'Your WordPress database has been successfully updated!' ); ?></p>
-	<p class="step"><a class="button button-large" href="<?php echo $backto; ?>"><?php _e( 'Continue' ); ?></a></p>
+	<p class="step"><a class="button button-large button-primary" href="<?php echo $backto; ?>"><?php _e( 'Continue' ); ?></a></p>
 
 <!--
 <pre>