  During the second LHC long shutdown (LS2) the Inner Tracking System (ITS) of
ALICE (A Large Ion Collider Experiment) will be replaced by seven layers of
CMOS Monolithic Active Pixel Sensors (MAPS). The latest innovations in silicon
imaging technology allow for the construction of large, ultra-thin silicon
wafers which can further improve the capabilities of the ALICE tracker. The
research and development studies towards the construction of a novel vertex
detector have started. The detector installation has been proposed for the
third LHC long shutdown (LS3) during which the three innermost layers shall be
replaced by three cylindrical layers of large curved CMOS wafers. This upgrade
(ITS3) will further improve the impact parameter resolution and the tracking
efficiency of low momentum particles. The innermost layer will be positioned
closer to the interaction point and the material budget will be reduced down to
0.05$\%X_0$ per layer. Monte Carlo simulations of a simplified ITS3 geometry
within the ITS2 design indicate an improvement in the impact parameter
resolution and the tracking efficiency, which are of crucial importance for
measurements of heavy-flavour hadrons. This contribution shows the improved
performance for the example of the $\Lambda_{\mathrm{b}}$, for which the
significance of its measurement is extracted based on these MC simulations. A
significant improvement by almost a factor of three in the low momentum region
compared to the ITS2 is observed.
