diff --git src/wp-includes/default-filters.php src/wp-includes/default-filters.php
index c50a9d9..6897c2e 100644
--- src/wp-includes/default-filters.php
+++ src/wp-includes/default-filters.php
@@ -294,8 +294,9 @@ add_action( 'begin_fetch_post_thumbnail_html', '_wp_post_thumbnail_class_filter_
 add_action( 'end_fetch_post_thumbnail_html',   '_wp_post_thumbnail_class_filter_remove' );
 
 // Redirect Old Slugs
-add_action( 'template_redirect', 'wp_old_slug_redirect'              );
-add_action( 'post_updated',      'wp_check_for_changed_slugs', 12, 3 );
+add_action( 'template_redirect',  'wp_old_slug_redirect'              );
+add_action( 'post_updated',       'wp_check_for_changed_slugs', 12, 3 );
+add_action( 'attachment_updated', 'wp_check_for_changed_slugs', 12, 3 );
 
 // Nonce check for Post Previews
 add_action( 'init', '_show_post_preview' );
diff --git src/wp-includes/post-functions.php src/wp-includes/post-functions.php
index 47db1df..81771c7 100644
--- src/wp-includes/post-functions.php
+++ src/wp-includes/post-functions.php
@@ -1330,7 +1330,7 @@ function _post_type_meta_capabilities( $capabilities = null ) {
  * @since 4.3.0 Added the `featured_image`, `set_featured_image`, `remove_featured_image`,
  *              and `use_featured_image` labels.
  * @since 4.4.0 Added the `insert_into_item` and `uploaded_to_this_item` labels.
- * 
+ *
  * @access private
  *
  * @param object $post_type_object Post type object.
@@ -3280,6 +3280,18 @@ function wp_insert_post( $postarr, $wp_error = false ) {
 			 * @param int $post_ID Attachment ID.
 			 */
 			do_action( 'edit_attachment', $post_ID );
+			$post_after = get_post( $post_ID );
+
+			/**
+			 * Fires once an existing attachment has been updated.
+			 *
+			 * @since 4.4.0
+			 *
+			 * @param int     $post_ID      Post ID.
+			 * @param WP_Post $post_after   Post object following the update.
+			 * @param WP_Post $post_before  Post object before the update.
+			 */
+			do_action( 'attachment_updated', $post_ID, $post_after, $post_before );
 		} else {
 
 			/**
@@ -5133,23 +5145,27 @@ function wp_mime_type_icon( $mime = 0 ) {
  * @param WP_Post $post_before The Previous Post Object
  */
 function wp_check_for_changed_slugs( $post_id, $post, $post_before ) {
-	// Don't bother if it hasnt changed.
-	if ( $post->post_name == $post_before->post_name )
+	// Don't bother if it hasn't changed.
+	if ( $post->post_name == $post_before->post_name ) {
 		return;
+	}
 
 	// We're only concerned with published, non-hierarchical objects.
-	if ( $post->post_status != 'publish' || is_post_type_hierarchical( $post->post_type ) )
+	if ( ! ( 'publish' === $post->post_status || 'attachment' === get_post_type( $post ) &&  'inherit' === $post->post_status ) || is_post_type_hierarchical( $post->post_type ) ) {
 		return;
+	}
 
-	$old_slugs = (array) get_post_meta($post_id, '_wp_old_slug');
+	$old_slugs = (array) get_post_meta( $post_id, '_wp_old_slug' );
 
 	// If we haven't added this old slug before, add it now.
-	if ( !empty( $post_before->post_name ) && !in_array($post_before->post_name, $old_slugs) )
-		add_post_meta($post_id, '_wp_old_slug', $post_before->post_name);
+	if ( ! empty( $post_before->post_name ) && ! in_array( $post_before->post_name, $old_slugs ) ) {
+		add_post_meta( $post_id, '_wp_old_slug', $post_before->post_name );
+	}
 
 	// If the new slug was used previously, delete it from the list.
-	if ( in_array($post->post_name, $old_slugs) )
-		delete_post_meta($post_id, '_wp_old_slug', $post->post_name);
+	if ( in_array( $post->post_name, $old_slugs ) ) {
+		delete_post_meta( $post_id, '_wp_old_slug', $post->post_name );
+	}
 }
 
 /**
diff --git src/wp-includes/query.php src/wp-includes/query.php
index 28cf56f..cc48edd 100644
--- src/wp-includes/query.php
+++ src/wp-includes/query.php
@@ -4736,12 +4736,15 @@ function wp_old_slug_redirect() {
 		global $wpdb;
 
 		// Guess the current post_type based on the query vars.
-		if ( get_query_var('post_type') )
-			$post_type = get_query_var('post_type');
-		elseif ( !empty($wp_query->query_vars['pagename']) )
+		if ( get_query_var( 'post_type' ) ) {
+			$post_type = get_query_var( 'post_type' );
+		} elseif ( get_query_var( 'attachment' ) ) {
+			$post_type = 'attachment';
+		} elseif ( ! empty( $wp_query->query_vars['pagename'] ) ) {
 			$post_type = 'page';
-		else
+		} else {
 			$post_type = 'post';
+		}
 
 		if ( is_array( $post_type ) ) {
 			if ( count( $post_type ) > 1 )
diff --git tests/phpunit/tests/rewrite/oldSlugRedirect.php tests/phpunit/tests/rewrite/oldSlugRedirect.php
index a166d43..5e8cdda 100644
--- tests/phpunit/tests/rewrite/oldSlugRedirect.php
+++ tests/phpunit/tests/rewrite/oldSlugRedirect.php
@@ -121,6 +121,19 @@ class Tests_Rewrite_OldSlugRedirect extends WP_UnitTestCase {
 		wp_old_slug_redirect();
 		$this->assertNull( $this->old_slug_redirect_url );
 		$this->assertQueryTrue( 'is_attachment', 'is_singular', 'is_single' );
+
+		$old_permalink = get_attachment_link( $attachment_id );
+
+		wp_update_post( array(
+			'ID' => $attachment_id,
+			'post_name' => 'the-attachment',
+		) );
+
+		$permalink = user_trailingslashit( trailingslashit( get_permalink( $this->post_id ) ) . 'the-attachment' );
+
+		$this->go_to( $old_permalink );
+		wp_old_slug_redirect();
+		$this->assertEquals( $permalink, $this->old_slug_redirect_url );
 	}
 
 	public function test_old_slug_redirect_paged() {