  Observation of several very high energy (VHE) flaring events of the BL Lac
object VER J0521+211 were reported by the VERITAS and MAGIC collaborations
between 2009 and 2014. The redshift of this source is uncertain and several
analysis have derived different limits for it. In the framework of the
photohadronic model, and using three different extragalactic background light
(EBL) models, we analyze seven independent VHE spectra of VER J0521+211 and
determine the limiting values on its redshift. It is observed that the
photohadronic scenario provides excellent fits to the reported observations. It
is further observed that the photohadronic scenario, along with the EBL model
of Dominguez et al., puts the most restrictive limits on the redshift z of VER
J0521+211: 0.29 <= z <= 0.31 from the confidence level (CL) intervals at 2
sigma, or a more conservative 0.28 <= z <= 0.33, at 3 sigma.
