The solubility of CO₂ in n-decane and n-decane + n-hexane system at temperatures between 303.15 K and 353.15 K and pressures up to 15 MPa was measured using a fused silica capillary cell (FSCC) with in situ Raman spectroscopy. The accuracy of temperature control is critical for obtaining a reliable solubility measurement, and Linkam's CAP500 stage was used to control the temperature of the FSCC where the solubility measurements were taken.