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AbstractWe investigate the reengineeering of interbank networks with a specific focus on capital increase. We consider a scenario where all other components of the network's infrastructure remain stable (a practical assumption for short-term situations). Our objective is to assess the impact of raising capital on the network's robustness and to address the following key aspects. First, given a predefined target for network robustness, our aim is to achieve this goal optimally, minimizing the required capital increase. Second, in cases where a total capital increase has been determined, the central challenge lies in distributing this increase among the banks in a manner that maximizes the stability of the network. To tackle these challenges, we begin by developing a comprehensive theoretical framework. Subsequently, we formulate an optimization model for the network's redesign. Finally, we apply this framework to practical examples, highlighting its applicability in real-world scenarios.