How can I change the elgg version number?

Hi all! I have elgg 1.8.3 running and just updated to version 1.8.5 successfully (appearently). The thing is tha the version number displayed in the admin summary section is not updated. This made me have to modify a plugin manifest that requires version 1.8.4 to 1.8.3. 

Can't I update this value manually for future plugins?

Thank you!!!