We investigated the structural stability of KBrO₃ by means of high-pressure Raman spectroscopy and angle-dispersive X-ray diffraction (AD-XRD). The Raman spectra of KBrO₃ at pressures up to 30.9 GPa showed no changes besides monotonic shifts, suggesting no structural transformation occurred up to the highest pressure studied. The AD-XRD suggested the sample remained in its ambient pressure hexagonal phase. The bulk modulus was determined to be B₀=25.9 (2) GPa with a pressure derivative  B’₀= 5.68 (0.38). With the combination of Raman and AD-XRD, Grüneisen parameters of KBrO₃ were also determined.