The EPO is increasing many official fees by about 1-2% with effect from 1 April 2016. See the Decision of the Administrative Council of 16 December 2015; CA/D 12/15, which can be found here.
The new fee amounts will apply to fees which are actually paid on or after 1 April 2016, regardless of the due date.
A comparison of the current (lower) and new (higher) amounts for many of the most common fees is shown in our Information Sheet which can be downloaded here.
Note that renewal fees for European patent applications may be paid no more than 3 months in advance of the due date. Therefore, for any renewal fees falling due at the end of April, May or June 2016, the current (lower) amount can be paid early, before 1 April 2016, in order to avoid the fee increase.