All pension recipients should have recently received a letter from ZUS informing them of a slight increase in their pension payments. The total amount of increase per quarter is approximately 29.55 zlotys (equivalent as of April 26, 2018 to be about 8.50 USD.)
You can find a summary of the change as well as a full translation of the letter here. The original Polish letter is followed by the English summary and translation, and opens in a new window.
The Polish pension is adjusted annually on March 1 to keep up with living expenses, so recipients can expect a slight increase at this time each year.