This paper outlines how ideas of 'degrowth' might be used to reimagine sustainable forms of education technology. In essence, degrowth calls for a proactive renewal of technology use around goals of voluntary simplicity and slowing-down, community-based coproduction and sharing, alongside conscious minimalization of resource consumption. The paper considers how core degrowth principles of conviviality, commoning, autonomy and care have been used to develop various forms of 'radically sustainable computing'. The paper then suggests four ways in which degrowth principles might frame future thinking around education technology in terms of: (i) curtailing current manipulative forms of education technology, (ii) bolstering existing convivial forms of education technology; (iii) stimulating the development of new convivial education technologies; and (iv) developing digital technologies to achieve the eventual de-schooling of society. It is concluded that mobilisation of these ideas might support a much-needed reorientation of digital technology in education along low-impact, equitable lines.