  In this contribution, the production rates and the transverse momentum
distributions of strange hadrons are reported as a function of charged particle
multiplicity. In this analysis, the data collected in proton-proton collisions
at $\sqrt{s}$ = 13 TeV with the ALICE detector at the LHC are used. It is found
that the production rate of $K_{S}^{0}$, $\Lambda$, $\Xi^{\pm}$, and $\Omega$
increases with multiplicity faster than that for charged particles. The higher
the strangeness content of the hadron, the more pronounced is the increase.
Moreover, the energy and multiplicity dependence of charged particle production
in pp collisions are presented and the results are compared to predictions from
Monte Carlo (MC) event generators. It turns out that the average multiplicity
density increases steeply with center-of-mass energy for high multiplicity
classes.
