diff --git a/src/wp-admin/includes/upgrade.php b/src/wp-admin/includes/upgrade.php
index c8235c314f431..c2270aa8196d7 100644
--- a/src/wp-admin/includes/upgrade.php
+++ b/src/wp-admin/includes/upgrade.php
@@ -886,6 +886,10 @@ function upgrade_all() {
 		upgrade_682();
 	}
 
+	if ( $wp_current_db_version < 60718 ) {
+		upgrade_690();
+	}
+
 	maybe_disable_link_manager();
 
 	maybe_disable_automattic_widgets();
@@ -2481,6 +2485,48 @@ function ( $url ) {
 	}
 }
 
+/**
+ * Executes changes made in WordPress 6.9.0.
+ *
+ * @ignore
+ * @since 6.9.0
+ *
+ * @global int $wp_current_db_version The old (current) database version.
+ */
+function upgrade_690() {
+	global $wp_current_db_version;
+
+	if ( $wp_current_db_version < 60718 ) {
+		/*
+		 * Query all templates in the database that are linked to the current
+		 * theme and activate them. See `get_block_templates()`.
+		 */
+		$template_query_args = array(
+			'post_status'         => 'publish',
+			'post_type'           => 'wp_template',
+			'posts_per_page'      => -1,
+			'no_found_rows'       => true,
+			'lazy_load_term_meta' => false,
+			'tax_query'           => array(
+				array(
+					'taxonomy' => 'wp_theme',
+					'field'    => 'name',
+					'terms'    => get_stylesheet(),
+				),
+			),
+		);
+
+		$template_query   = new WP_Query( $template_query_args );
+		$active_templates = array();
+
+		foreach ( $template_query->posts as $post ) {
+			$active_templates[ $post->post_name ] = $post->ID;
+		}
+
+		update_option( 'active_templates', $active_templates );
+	}
+}
+
 /**
  * Executes network-level upgrade routines.
  *
diff --git a/src/wp-includes/version.php b/src/wp-includes/version.php
index d897a077b226b..dc25764035989 100644
--- a/src/wp-includes/version.php
+++ b/src/wp-includes/version.php
@@ -23,7 +23,7 @@
  *
  * @global int $wp_db_version
  */
-$wp_db_version = 60717;
+$wp_db_version = 60718;
 
 /**
  * Holds the TinyMCE version.