title: How to update dart SDK to latest stable version in flutter
body: <p>I would like to use dart SDK: ">=2.6.0 &lt;3.0.0" with flutter. But my current version of dart used by Flutter is 2.5.0.</p>
  
  <p>After tried <code>flutter upgrade</code> my flutter version is:</p>
  
  <pre><code>flutter --version 
  Flutter 1.9.1+hotfix.6 • channel stable • https://github.com/flutter/flutter.git
  Framework • revision 68587a0916 (3 months ago) • 2019-09-13 19:46:58 -0700
  Engine • revision b863200c37
  Tools • Dart 2.5.0
  </code></pre>
  
  <p>I have tried to download the latest stable release of Flutter SDK(2.6.1) from the <a href="https://dart.dev/tools/sdk/archive" rel="noreferrer">link</a> and replace it with the already available dart-sdk inside <strong>flutter > bin > cache > dart-sdk</strong> but after this steps I am getting below error:</p>
  
  <pre><code>Wrong full snapshot version, expected 'cb187597a166f2c0c64a200e22509ee3' found 'c8562f0ee0ebc38ba217c7955956d1cb' 
  
  Isolate creation failed
  </code></pre>
  
  <p>Is there any other way to solve these issues and upgrade dart-sdk in flutter?</p>