How to resolve error 'Unresolved dependency System ...' encoutered when trying to upgrade Drupal core? I'm trying to update Drupal core from 7.28 to 7.36. (not using Drush)

When running update.php I get:


  Unresolved dependency  System (Version >=7.33 required)
  Relation requires this module and version. Currently using System version 7.28


It seems like the Relation module wants a version 7.33 or higher, and yet it won't let me upgrade to a version 7.33 or higher. Not quite sure how to get past this.

Relation ver. 7.x-1.0-rc7  (It didn't seem to have any trouble when I upgraded to 7.28).

How can I resolve this?
The reason for your error is because of the last line in the info file of the Relation module, i.e.:


  dependencies[] = system (>=7.33)


In regular English it is something like "This version of the Relation module requires Drupal core to be at a level which is at least 7.33".

To resolve it perform these steps:


Disable of the Relation module.
Retry your core upgrade again (that error should not show up anymore, as per step "1.").
Re-enable the Relation module again.


I'd be interested to hear what result you get in that scenario ...

Note: since your site is pre 7.32, you may want to also work on things such as what is in suggested in the answers to Drupal SA-CORE-2014-005 - How to tell if my server / sites were compromised?