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The Baryon Oscillation Spectroscopic Survey (BOSS) has collected more than 150,000 2.1 ≤ z ≤ 3.5 quasar spectra since 2009. Using this unprecedented sample, we create a composite spectrum in the rest-frame of 102,150 quasar spectra from 800 Å to 3300 Å at a signal-to-noise ratio close to 1000 per pixel (Δ v of 69 km s^-1). Included in this analysis is a correction to account for flux calibration residuals in the BOSS spectrophotometry. We determine the spectral index as a function of redshiftdoi:10.3847/0004-6256/151/6/155 fatcat:ckemn23parga5mv3qnjvb4ckdu