diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2543def27..1fc087179 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,7 +16,7 @@ jobs:
         timeout-minutes: 15
         strategy:
             matrix:
-                php: [ '8.3', '8.2', '8.1', '8.0' ]
+                php: [ '8.4', '8.3', '8.2', '8.1', '8.0' ]
                 dependency-version: [ '' ]
                 platform-reqs: [ '' ]
                 include:
@@ -53,7 +53,7 @@ jobs:
             -   name: Setup PHP
                 uses: shivammathur/setup-php@v2
                 with:
-                    php-version: '8.2'
+                    php-version: '8.3'
                     tools: composer:v2, cs2pr
                     coverage: none
             -   name: Cache Composer dependencies
@@ -76,7 +76,7 @@ jobs:
             -   name: Setup PHP
                 uses: shivammathur/setup-php@v2
                 with:
-                    php-version: '8.2'
+                    php-version: '8.3'
                     tools: composer:v2, cs2pr
                     coverage: none
             -   name: Cache Composer dependencies
diff --git a/.github/workflows/update-layer-versions.yml b/.github/workflows/update-layer-versions.yml
index b384efee4..eb5ebadcc 100644
--- a/.github/workflows/update-layer-versions.yml
+++ b/.github/workflows/update-layer-versions.yml
@@ -38,7 +38,7 @@ jobs:
             -   name: Setup PHP
                 uses: shivammathur/setup-php@v2
                 with:
-                    php-version: '8.2'
+                    php-version: '8.3'
                     tools: composer
 
             -   name: Install Composer dependencies
diff --git a/docs/runtimes.mdx b/docs/runtimes.mdx
index 48255fe97..551e43324 100644
--- a/docs/runtimes.mdx
+++ b/docs/runtimes.mdx
@@ -92,6 +92,8 @@ Bref currently provides runtimes for PHP 8.0, 8.1, 8.2 and 8.3:
 - `php-81-console`
 - `php-80-console`
 
+Bref also provides runtimes for alpha versions of PHP 8.4.
+
 <Callout>
     `php-80` means PHP 8.0.\*. It is not possible to require a specific "patch" version. The latest Bref versions always aim to support the latest PHP versions, so upgrade via Composer frequently to keep PHP up to date.
 </Callout>
diff --git a/index.js b/index.js
index c660ab3ea..5f09fe63e 100644
--- a/index.js
+++ b/index.js
@@ -47,7 +47,7 @@ class ServerlessPlugin {
             .filter(name => !name.startsWith('arm-'));
         // Console runtimes must have a PHP version provided
         this.runtimes = this.runtimes.filter(name => name !== 'console');
-        this.runtimes.push('php-80-console', 'php-81-console', 'php-82-console', 'php-83-console');
+        this.runtimes.push('php-80-console', 'php-81-console', 'php-82-console', 'php-83-console', 'php-84-console');
 
         this.checkCompatibleRuntime();
 
diff --git a/utils/layers.json/update.php b/utils/layers.json/update.php
index 06c149eb7..3d2412119 100644
--- a/utils/layers.json/update.php
+++ b/utils/layers.json/update.php
@@ -13,6 +13,8 @@
 require_once __DIR__ . '/../../vendor/autoload.php';
 
 const LAYER_NAMES = [
+    'php-84',
+    'php-84-fpm',
     'php-83',
     'php-83-fpm',
     'php-82',
@@ -21,6 +23,8 @@
     'php-81-fpm',
     'php-80',
     'php-80-fpm',
+    'arm-php-84',
+    'arm-php-84-fpm',
     'arm-php-83',
     'arm-php-83-fpm',
     'arm-php-82',