title: Google Play services out of date. Requires 10084000 but found 9879470. Can't update
body: <p>I am making an android app with Firebase. These are the lines causing problems:</p>
  
  <pre><code>dependencies {
      compile 'com.google.firebase:firebase-core:10.0.1'
      compile 'com.google.firebase:firebase-auth:10.0.1'
  </code></pre>
  
  <p>I get this error:</p>
  
  <pre><code>Google Play services out of date.  Requires 10084000 but found 9879470. 
  </code></pre>
  
  <p>I run the app on an emulator. It doesn't seem possible to update GPS on the emulator, since it doesn't have Google Play Store.</p>
  
  <p>In SDK Manager, it says the version of Google Player services is 38.</p>
  
  <p>There is no apparent way to update this either.</p>