We present the results of our optical (VRI) observations of the TeV blazar PG 1553+113 over eight nights in 2016 April. We monitored the blazar quasi-simultaneously in V and R bands each night and examined the light curves (LCs) for intraday flux and color variations using power-enhanced F-test. The source was found to be significantly variable in both V and R bands only on April 08 and 13, while
variations only in R band LCs were seen on April 09, 11 and 12. Variation in color with time was found on April 13 only. Significant positive correlations between the V-R color index and V band magnitude were detected over six nights indicating the general bluer-
when-brighter trend. We found a mean optical spectral index of ∼ 0.83 ± 0.02 with maximum variation of 0.21 by fitting a power law (F ν ∝ ν −α ) in the optical (VRI) spectral energy distribution of PG 1553+113. We briefly discuss the possible physical processes
responsible for the observed flux and spectral variability.