diff --git a/amp.php b/amp.php
index f2bead495cb..32c8f574210 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: 1.5.0-alpha
+ * Version: 1.5.0-RC1
  * 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', '1.5.0-alpha' );
+define( 'AMP__VERSION', '1.5.0-RC1' );
 
 /**
  * Errors encountered while loading the plugin.
diff --git a/readme.md b/readme.md
index c6b48b27717..d1289cc26bc 100644
--- a/readme.md
+++ b/readme.md
@@ -4,10 +4,10 @@
 ![Banner](wp-assets/banner-1544x500.png)
 Official AMP plugin, supported by the AMP team. Formerly Accelerated Mobile Pages, AMP enables great experiences across both mobile and desktop.
 
-**Contributors:** [google](https://profiles.wordpress.org/google), [xwp](https://profiles.wordpress.org/xwp), [automattic](https://profiles.wordpress.org/automattic), [westonruter](https://profiles.wordpress.org/westonruter), [swissspidy](https://profiles.wordpress.org/swissspidy), [miinasikk](https://profiles.wordpress.org/miinasikk), [ryankienstra](https://profiles.wordpress.org/ryankienstra), [albertomedina](https://profiles.wordpress.org/albertomedina), [tweetythierry](https://profiles.wordpress.org/tweetythierry)  
+**Contributors:** [google](https://profiles.wordpress.org/google), [xwp](https://profiles.wordpress.org/xwp), [automattic](https://profiles.wordpress.org/automattic), [westonruter](https://profiles.wordpress.org/westonruter), [albertomedina](https://profiles.wordpress.org/albertomedina), [schlessera](https://profiles.wordpress.org/schlessera), [swissspidy](https://profiles.wordpress.org/swissspidy), [pierlo](https://profiles.wordpress.org/pierlo), [ryankienstra](https://profiles.wordpress.org/ryankienstra)  
 **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:** 5.3.2  
+**Tested up to:** 5.4  
 **Stable tag:** 1.4.4  
 **License:** [GPLv2 or later](http://www.gnu.org/licenses/gpl-2.0.html)  
 **Requires PHP:** 5.6  
@@ -57,9 +57,9 @@ If you are a developer, we encourage you to [follow along](https://github.com/am
 
 ![All core themes are supported, and many themes can be served as AMP with minimal changes, Otherwise, behavior is often as if JavaScript is turned off in the browser since scripts are removed.](wp-assets/screenshot-2.png)
 
-### Reader mode templates are still available, but they are differ from the active theme.
+### Reader mode templates are still available, but they differ from the active theme.
 
-![Reader mode templates are still available, but they are differ from the active theme.](wp-assets/screenshot-3.png)
+![Reader mode templates are still available, but they differ from the active theme.](wp-assets/screenshot-3.png)
 
 ### Switch from Reader mode to Transitional or Standard mode in AMP settings screen.
 
diff --git a/readme.txt b/readme.txt
index ab44cfb2dea..f35ff0e0ca5 100644
--- a/readme.txt
+++ b/readme.txt
@@ -1,8 +1,8 @@
 === AMP ===
-Contributors: google, xwp, automattic, westonruter, swissspidy, miinasikk, ryankienstra, albertomedina, tweetythierry
+Contributors: google, xwp, automattic, westonruter, albertomedina, schlessera, swissspidy, pierlo, ryankienstra
 Tags: amp, mobile, optimization, accelerated mobile pages, framework, components, blocks, performance, ux, seo, official
 Requires at least: 4.9
-Tested up to: 5.3.2
+Tested up to: 5.4
 Stable tag: 1.4.4
 License: GPLv2 or later
 License URI: http://www.gnu.org/licenses/gpl-2.0.html
@@ -47,7 +47,7 @@ If you are a developer, we encourage you to [follow along](https://github.com/am
 
 1. In the website experience, theme support enables you to reuse the active theme's templates and stylesheets; all WordPress features (menus, widgets, comments) are available in AMP.
 2. All core themes are supported, and many themes can be served as AMP with minimal changes, Otherwise, behavior is often as if JavaScript is turned off in the browser since scripts are removed.
-3. Reader mode templates are still available, but they are differ from the active theme.
+3. Reader mode templates are still available, but they differ from the active theme.
 4. Switch from Reader mode to Transitional or Standard mode in AMP settings screen.
 5. Standard mode: Using AMP as the framework for your site, not having to maintain an AMP and non-AMP version. Mobile and desktop users get same experience.
 6. Transitional mode: A path to making your site fully AMP-compatible, with tools to assist with debugging validation issues along the way.