Murańka debuted in the World Championships 2015 in Falun, Sweden. He was 17th on normal hill (K-90) and 20th in the competition on the large hill Lugnet (K-120). On 28 February 2015 Polish team in squad: Murańka, Piotr Żyła, Kamil Stoch and Jan Ziobro achieved bronze medal of World Championships 2015 in team.