The present invention concerns variants of cellobiohydrolase, preferably Cbh1, which have greater cellobiohydrolase activity. The invention also relates to a gene construct, a host cell and an enzyme composition comprising said variants. The invention further relates to a method for producing fermentable sugar and a method for producing a bioproduct, such as bioethanol, from cellulose material with the cellobiohydrolase variants, the host cell or the enzyme composition comprising said variants.