At my dashboard show me a message that I required to upgrade my WordPress. But look at official page and you need follow a protocol. Backup your blog files, and your database files. Upload the new wordpress and running the upgrade and some more task.
I just search about other procedure, and find via TheSpotter how to upgrade using WordPress Automatic Upgrade Plugin.
I had upgrade from 2.5.1 to the latest 2.6.3 version using this plugin and entire process was smooth and completely painless.
Highly recommended you install WordPress Automatic Upgrade plugin and save yourself a lot of trouble! and at 5 step (first backup your files, second backup database, third de-activate your plugins, forth update your wordpress, and finally re-activate your plugins). It’s great, you must try.
Always Backup your Blog and Data First – Proceed to Upgrade Second!

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