title: Dart | Flutter Package: How to update a Packge Not allowing my development to make progress?
body: <p>The Following Package has not been updated:
  <a href="https://pub.dartlang.org/packages/tts" rel="nofollow noreferrer">https://pub.dartlang.org/packages/tts</a> 
  I am getting the same error. 
  Is there any way I can update or fix this issue on my side to continue <a href="https://pub.dartlang.org/packages/tts#-analysis-tab-" rel="nofollow noreferrer">https://pub.dartlang.org/packages/tts#-analysis-tab-</a></p>
  
  <pre><code>Running flutter packages pub upgrade failed with the following output:
  
  ERR: The current Dart SDK version is 2.1.0-dev.1.0.flutter-69fce633b7.
  
  Because tts requires SDK version &gt;=1.8.0 &lt;=2.0.0, version solving failed.
  </code></pre>