Check What Version of Drupal You Are Running
Updated: April 2, 2015
The version number of the currently installed version of Drupal is listed in several places.
In the root directory of the Drupal installation the CHANGELOG.txt lists the version number.
In the administration interface of Drupal you can see what version you are running on the Status page in the Logs menu in Drupal 5 and Status Report page in the Reports menu in Drupal 6 & 7.
You can keep track of what versions of Drupal are running on all of the websites you manage with our Up to Date? Chrome app.
Current Versions of Drupal
6.35 and 7.36