The associated production of the Higgs boson with a pair of top/anti-top quarks (ttH) is the only process providing a direct access to the measurement of the Yukawa coupling between the Higgs boson and the top quark. The presented results exploit the data collected during 2015 and 2016 by the ATLAS experiment during LHC collisions at a center-of-mass energy of 13 TeV with an integrated luminosity of 13.2/fb. The improvement of the analysis includes the use of multivariate techniques in order to discriminate between signal and background events, dominated by the tt production. Moreover, due to the very high pT of the produced particles, the jets have been reconstructed with a specific designed algorithms ("boosted techniques") that take advantages of their peculiar substructure.