diff --git a/amp.php b/amp.php
index aebfc6326aa..3b6e5abf74a 100644
--- a/amp.php
+++ b/amp.php
@@ -5,7 +5,7 @@
  * Plugin URI: https://amp-wp.org
  * Author: AMP Project Contributors
  * Author URI: https://github.com/ampproject/amp-wp/graphs/contributors
- * Version: 1.5.1-alpha
+ * Version: 1.5.1
  * Text Domain: amp
  * Domain Path: /languages/
  * License: GPLv2 or later
@@ -15,7 +15,7 @@
 
 define( 'AMP__FILE__', __FILE__ );
 define( 'AMP__DIR__', dirname( __FILE__ ) );
-define( 'AMP__VERSION', '1.5.1-alpha' );
+define( 'AMP__VERSION', '1.5.1' );
 
 /**
  * Errors encountered while loading the plugin.
diff --git a/readme.md b/readme.md
index ec628365fbf..62f8dc64e4a 100644
--- a/readme.md
+++ b/readme.md
@@ -8,7 +8,7 @@ Official AMP plugin, supported by the AMP team. Formerly Accelerated Mobile Page
 **Tags:** [amp](https://wordpress.org/plugins/tags/amp), [mobile](https://wordpress.org/plugins/tags/mobile), [optimization](https://wordpress.org/plugins/tags/optimization), [accelerated mobile pages](https://wordpress.org/plugins/tags/accelerated-mobile-pages), [framework](https://wordpress.org/plugins/tags/framework), [components](https://wordpress.org/plugins/tags/components), [blocks](https://wordpress.org/plugins/tags/blocks), [performance](https://wordpress.org/plugins/tags/performance), [ux](https://wordpress.org/plugins/tags/ux), [seo](https://wordpress.org/plugins/tags/seo), [official](https://wordpress.org/plugins/tags/official)  
 **Requires at least:** 4.9  
 **Tested up to:** 5.4  
-**Stable tag:** 1.5.0  
+**Stable tag:** 1.5.1  
 **License:** [GPLv2 or later](http://www.gnu.org/licenses/gpl-2.0.html)  
 **Requires PHP:** 5.6  
 
diff --git a/readme.txt b/readme.txt
index 56a6fc2af4d..a0745a14f87 100644
--- a/readme.txt
+++ b/readme.txt
@@ -3,7 +3,7 @@ Contributors: google, xwp, automattic, westonruter, albertomedina, schlessera, s
 Tags: amp, mobile, optimization, accelerated mobile pages, framework, components, blocks, performance, ux, seo, official
 Requires at least: 4.9
 Tested up to: 5.4
-Stable tag: 1.5.0
+Stable tag: 1.5.1
 License: GPLv2 or later
 License URI: http://www.gnu.org/licenses/gpl-2.0.html
 Requires PHP: 5.6