Many organizations adopting enterprise resource planning (ERP) systems are failing to achieve their anticipated business goals, the major reason being system under-utilization. It is imperative to understand the way users learn to use ERP systems effectively. This is especially important given the integrated and complex nature of the ERP system, which forces users to continually learn new skills after implementation. This study aims to explore the role played by post-implementation learning in ERP usage. Moreover, we identify social capital and post-training self-efficacy as antecedents to post-implementation learning. A survey method was employed to collect data from 659 ERP users. This study finds that post-implementation learning contributes to ERP usage, and that social capital and post-training self-efficacy are important antecedents to post-implementation learning. Our findings provide academics and practitioners with an understanding of how post-implementation learning can be manipulated to improve ERP usage.