  The high-pressure phase of La(O,F)BiS$_{\mathrm{2}}$ exhibits the highest
transition temperature among all the BiS$_{\mathrm{2}}$-based superconductors.
Various studies, such as investigation of isotope effects, have been conducted
to explain its superconducting mechanism. However, there are very few reports
on the electrical transport properties and vibration modes of single
crystalline La(O,F)BiS$_{\mathrm{2}}$ under high pressure. In this study, we
developed a diamond anvil cell with dual-probe diamond electrodes to measure
the electrical transport properties of La(O,F)BiS$_{\mathrm{2}}$ single crystal
and Pb as a manometer at low temperature. Using the developed system, a linear
decrease in the transition temperature and phonon hardening was observed under
the application of pressure on La(O,F)BiS$_{\mathrm{2}}$ single crystal.
