This paper examines whether high quality, curriculum-based training at the workplace makes firms more innovative. Our dependent variable innovativeness is operationalized with four different measures: general innovation, product innovation, process innovation and patent applications. As explanatory variable we use regulated apprenticeship training programs with three to four years length of the type found in German speaking countries. We argue that this type of curriculum-based workplace training provides an additional source of knowledge in the knowledge production process through its innovative and steadily revised training curricula. We expect that this additional source of knowledge leads to higher innovation in training firms compared to non-training firms. Our empirical results show that up-to-date curriculum-based apprenticeship training is positively associated with all of the four innovation measures. Taking endogenous apprenticeship decision into account, the positive effect is only significant for general innovation and patent applications.