diff --git a/wp-admin/credits.php b/wp-admin/credits.php
index 299bbf073b..9cc4544c29 100644
--- a/wp-admin/credits.php
+++ b/wp-admin/credits.php
@@ -109,8 +109,6 @@ if ( ! $credits ) {
 
 echo '<p class="about-description">' . __( 'WordPress is created by a worldwide team of passionate individuals.' ) . "</p>\n";
 
-$gravatar = is_ssl() ? 'https://secure.gravatar.com/avatar/' : 'http://0.gravatar.com/avatar/';
-
 foreach ( $credits['groups'] as $group_slug => $group_data ) {
 	if ( $group_data['name'] ) {
 		if ( 'Translators' == $group_data['name'] ) {
@@ -144,8 +142,11 @@ foreach ( $credits['groups'] as $group_slug => $group_data ) {
 			foreach ( $group_data['data'] as $person_data ) {
 				echo '<li class="wp-person" id="wp-person-' . $person_data[2] . '">' . "\n\t";
 				echo '<a href="' . sprintf( $credits['data']['profiles'], $person_data[2] ) . '">';
-				$size = 'compact' == $group_data['type'] ? '30' : '60';
-				echo '<img src="' . $gravatar . $person_data[1] . '?s=' . $size . '" srcset="' . $gravatar . $person_data[1] . '?s=' . $size * 2 . ' 2x" class="gravatar" alt="' . esc_attr( $person_data[0] ) . '" /></a>' . "\n\t";
+				$size = 'compact' == $group_data['type'] ? 30 : 60;
+				$data = get_avatar_data( $person_data[1] . '@md5.gravatar.com', array( 'size' => $size ) );
+				$size *= 2;
+				$data2x = get_avatar_data( $person_data[1] . '@md5.gravatar.com', array( 'size' => $size ) );
+				echo '<img src="' . esc_attr( $data['url'] ) . '" srcset="' . esc_attr( $data2x['url'] ) . ' 2x" class="gravatar" alt="' . esc_attr( $person_data[0] ) . '" /></a>' . "\n\t";
 				echo '<a class="web" href="' . sprintf( $credits['data']['profiles'], $person_data[2] ) . '">' . $person_data[0] . "</a>\n\t";
 				if ( ! $compact )
 					echo '<span class="title">' . translate( $person_data[3] ) . "</span>\n";
diff --git a/wp-includes/feed.php b/wp-includes/feed.php
index bd795d0da7..01e2c2427a 100644
--- a/wp-includes/feed.php
+++ b/wp-includes/feed.php
@@ -102,6 +102,7 @@ function get_last_build_date_feed() {
 
 	if ( $wp_query->have_posts() ) {
 		$post_ids = array();
+		$post_times = array();
 		foreach( $wp_query->posts as $post ) {
 			$post_ids[] = $post->ID;
 			$post_times[] = $post->post_modified_gmt;
diff --git a/wp-includes/link-template.php b/wp-includes/link-template.php
index a09dfdb57c..00d3d98a24 100644
--- a/wp-includes/link-template.php
+++ b/wp-includes/link-template.php
@@ -3650,7 +3650,11 @@ function get_avatar_data( $id_or_email, $args = null ) {
 		'r' => $args['rating'],
 	);
 
-	$url = sprintf( 'http://%d.gravatar.com/avatar/%s', $gravatar_server, $email_hash );
+	if ( is_ssl() ) {
+		$url = 'https://secure.gravatar.com/avatar/' . $email_hash;
+	} else {
+		$url = sprintf( 'http://%d.gravatar.com/avatar/%s', $gravatar_server, $email_hash );
+	}
 
 	$url = add_query_arg(
 		rawurlencode_deep( array_filter( $url_args ) ),
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 3c648afc0f..2ee01ec3af 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.3-alpha-32844';
+$wp_version = '4.3-alpha-32845';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.