diff --git a/wp-includes/media-template.php b/wp-includes/media-template.php
index 04fd8a644e..d35d6fcd9f 100644
--- a/wp-includes/media-template.php
+++ b/wp-includes/media-template.php
@@ -1294,9 +1294,9 @@ function wp_print_media_templates() {
 					<dl class="gallery-item">
 						<dt class="gallery-icon">
 							<# if ( attachment.thumbnail ) { #>
-								<img src="{{ attachment.thumbnail.url }}" width="{{ attachment.thumbnail.width }}" height="{{ attachment.thumbnail.height }}" alt="" />
+								<img src="{{ attachment.thumbnail.url }}" width="{{ attachment.thumbnail.width }}" height="{{ attachment.thumbnail.height }}" alt="{{ attachment.alt }}" />
 							<# } else { #>
-								<img src="{{ attachment.url }}" alt="" />
+								<img src="{{ attachment.url }}" alt="{{ attachment.alt }}" />
 							<# } #>
 						</dt>
 						<# if ( attachment.caption ) { #>
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 795c327d54..4c57437b3b 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.2.3-alpha-45864';
+$wp_version = '5.2.3-alpha-45865';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.