In order to maintain your trademark rights, you will of course have to renew your registration.

It is also important that you keep using the trademark to maintain your rights. A third party may claim the revocation of your rights if you have not used your trademark in the 5 years following registration or if you have not genuinely used the trademark during an uninterrupted period of 5 years. In many countries that term can even be shorter (e.g. 3 years in China). The use must therefore be sufficiently extensive.

This also means that you must use the trademark as registered. If you have registered your logo and after a few years you change your logo considerably, a new registration will be recommended to avoid that the registration of your old logo can be cancelled due to non-use.

brantsandpatents recommends that you keep careful records of evidence of use of your trademark in all countries in which you operate, and from the very first use.