COVID-19 (coronavirus disease 2019) pandemic has affected almost every aspect of our lives. While millions of people fought with the disease, economies, societies and institutions faced side-effects of government measures resisting the spread of the virus. This article describes the effects of the pandemic on the legislative behaviour of MPs in one of the worst-hit countries in the world, the Czech Republic. The results show that the number of bill proposals and roll calls substantially increased during the pandemic compared to pre-pandemic times. Since the start of the outbreak, a third of roll calls and a half of bill proposals concerned the pandemic. Nonetheless, the outbreak did not substantially affect the voting unity of parliamentary party groups nor the opposition became more supportive of the cabinet. Still, while the liberal Pirates became more cooperative during the pandemic than the pre-pandemic period, the rightist antisystem party Freedom and Direct Democracy receded from the rest of the parties on the pandemic issues.