We update our previous constraints on two-component hot dark matter ( axions and neutrinos ) , including the recent WMAP 5-year data release . Marginalising over \sum m _ { \nu } provides m _ { a } < 1.02 eV ( 95 % C.L . ) for the axion mass . In the absence of axions we find \sum m _ { \nu } < 0.63 eV ( 95 % C.L . ) .