diff --git a/wp-content/themes/twentysixteen/css/editor-blocks.css b/wp-content/themes/twentysixteen/css/editor-blocks.css
index 0eef6016c3..6fd2ddb01e 100644
--- a/wp-content/themes/twentysixteen/css/editor-blocks.css
+++ b/wp-content/themes/twentysixteen/css/editor-blocks.css
@@ -634,6 +634,13 @@ Description: Used to style blocks in the editor.
 	margin-bottom: 16px;
 }
 
+/* Avatar & Post Author */
+
+.editor-styles-wrapper .avatar,
+.wp-block-post-author__avatar img {
+	border-radius: 50%;
+}
+
 /*--------------------------------------------------------------
 7.0 Blocks - Colors
 --------------------------------------------------------------*/
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 6c67085712..9bc95144bc 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.5-alpha-57576';
+$wp_version = '6.5-alpha-57577';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.