Promoting intergroup friendships in schools is regarded as a powerful strategy for improving outgroup attitudes. However, stochastic actor-oriented modelling (SAOM) studies have often revealed no association between intergroup friendship and outgroup attitudes. I investigated whether SAOM studies reported no effect of intergroup friendship on outgroup attitudes, what was responsible for this surprising finding and whether exposure to outgroup peers was positively related to outgroup attitudes. The meta-analysis of SAOM studies confirms no association between intergroup friendship and outgroup attitudes. Examining longitudinal social network data of 2700 German students, I found that a positive link between intergroup friendship and outgroup attitudes appeared only when I did not control for social influence. This indicates that intergroup friendship did not automatically improve outgroup attitudes. Instead, the development of outgroup attitudes among students depended on social influence and, thus, the quality of outgroup attitudes among their outgroup friends. Exposure to outgroup peers was, however, positively associated with outgroup attitudes. These findings reframe intergroup contact theory by suggesting that intergroup friendship is not essential for improving outgroup attitudes. Rather, social influence and exposure to outgroup peers could be key factors shaping outgroup attitudes.