Traditional patterns of political participation and party representation in Europe have been put to the test by the so-called crisis of representative democracy: mainstream parties have been perceived as more unfit to govern; the level of electoral participation has decreased; and voters have shown increasing dissatisfaction with representative institutions. In several cases, these changes have pushed governing elites to (seek to) redefine the ‘rules’ of the political process, in response to the challenges posed by new party contesters. In particular, in different European countries political actors have stressed the need to undermine the role of second chambers as veto players. This article focuses on both successful and failed attempts of reforms of bicameralism between 2006 and 2016 in seven EU countries (Belgium; Germany; Ireland; Italy; Romania; Spain; UK). It tries (1) to understand if political elites in Europe have pursued parliamentary reforms as a reaction to ‘democratic stress’ and (2) to single out the circumstances of success and failures. A discussion of the detectable trends of institutional reforms during democratic crises and some tentative explanations are finally provided