title: DEbian squeeze upgrade PHP 5.3 to PHP 5.5
body: <p>On Debian (Squeeze), I need to upgrade from PHP 5.3 to PHP 5.5.</p>
  
  <p>I tried those commands :
  apt-get update; apt-get install php5;</p>
  
  <p>also adding :</p>
  
  <pre><code>echo "deb http://packages.dotdeb.org squeeze all" &gt;&gt; /etc/apt/sources.list
  echo "deb-src http://packages.dotdeb.org squeeze all" &gt;&gt; /etc/apt/sources.list
  </code></pre>
  
  <p>But nothing change, it's still PHP 5.3. Any ideas ?  Thanks</p>