The year 1748 is considered the founding year of our current university library (in short "UB") of the TU Braunschweig. This makes it one of the oldest libraries of a technical university and this year it celebrates its 275th birthday: a good reason to celebrate. With the beginning of the summer semester, we start our diverse anniversary program. For the so-called "UBiläum", there will be many insights into the history and work of the university library, plus glimpses behind the scenes. In November, a ceremony will be the highlight of the anniversary year. Under the hashtag "#ubiläum275" on social media, we report on our activities throughout this year.