diff --git a/README.md b/README.md
index bfd8aac..20072ad 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # JBZoo / Mermaid-PHP
 
-[![Build Status](https://travis-ci.org/JBZoo/Mermaid-PHP.svg?branch=master)](https://travis-ci.org/JBZoo/Mermaid-PHP)    [![Coverage Status](https://coveralls.io/repos/JBZoo/Mermaid-PHP/badge.svg)](https://coveralls.io/github/JBZoo/Mermaid-PHP?branch=master)    [![Psalm Coverage](https://shepherd.dev/github/JBZoo/Mermaid-PHP/coverage.svg)](https://shepherd.dev/github/JBZoo/Mermaid-PHP)    
+[![Build Status](https://travis-ci.org/JBZoo/Mermaid-PHP.svg)](https://travis-ci.org/JBZoo/Mermaid-PHP)    [![Coverage Status](https://coveralls.io/repos/JBZoo/Mermaid-PHP/badge.svg)](https://coveralls.io/github/JBZoo/Mermaid-PHP)    [![Psalm Coverage](https://shepherd.dev/github/JBZoo/Mermaid-PHP/coverage.svg)](https://shepherd.dev/github/JBZoo/Mermaid-PHP)    
 [![Stable Version](https://poser.pugx.org/jbzoo/mermaid-php/version)](https://packagist.org/packages/jbzoo/mermaid-php)    [![Latest Unstable Version](https://poser.pugx.org/jbzoo/mermaid-php/v/unstable)](https://packagist.org/packages/jbzoo/mermaid-php)    [![Dependents](https://poser.pugx.org/jbzoo/mermaid-php/dependents)](https://packagist.org/packages/jbzoo/mermaid-php/dependents?order_by=downloads)    [![GitHub Issues](https://img.shields.io/github/issues/jbzoo/mermaid-php)](https://github.com/JBZoo/Mermaid-PHP/issues)    [![Total Downloads](https://poser.pugx.org/jbzoo/mermaid-php/downloads)](https://packagist.org/packages/jbzoo/mermaid-php/stats)    [![GitHub License](https://img.shields.io/github/license/jbzoo/mermaid-php)](https://github.com/JBZoo/Mermaid-PHP/blob/master/LICENSE)
 
 
diff --git a/composer.json b/composer.json
index 20f4dbf..77120e0 100644
--- a/composer.json
+++ b/composer.json
@@ -12,12 +12,12 @@
         }
     ],
     "require"           : {
-        "php"      : "^7.2",
+        "php"      : ">=7.2",
         "ext-json" : "*"
     },
 
     "require-dev"       : {
-        "jbzoo/toolbox-dev" : "^2.1.0"
+        "jbzoo/toolbox-dev" : "^2.4.0"
     },
 
     "autoload"          : {
diff --git a/src/Render.php b/src/Render.php
index 3e87ba2..cd8d48b 100644
--- a/src/Render.php
+++ b/src/Render.php
@@ -21,7 +21,7 @@
  */
 class Render
 {
-    public const DEFAULT_VERSION = '8.6.0';
+    public const DEFAULT_VERSION = '8.6.4';
 
     public const THEME_DEFAULT = 'default';
     public const THEME_FOREST  = 'forest';