Most of the innovation adoption framework in an organization ends at the adoption stage. For an innovation to be acculturated by the organization, there should be an on-going effort of assimilation to further create the impact and value of the innovation usage. Being the most important organization entity in Open Government Data (OGD) innovation, continuous adoption of OGD in public sector is crucial. OGD innovation must be incorporated into the public sectors to fully secure the benefits. Therefore, the aim of this article is to examines the important issues and challenges of OGD adoption in public sectors and identified factors that could contribute to post-adoption stage. Drawing from Technology-Organization-Environment framework and unified framework of post-adoption activities, this paper also intended to find gaps in OGD implementation in public sector to design and propose solutions.