  In this work, we present transit timing variations detected for the exoplanet
TrES-5b. To obtain the necessary amount of photometric data for this exoplanet,
we have organized an international campaign to search for exoplanets based on
the Transit Timing Variation method (TTV) and as a result of this we collected
30 new light curves, 15 light curves from the Exoplanet Transit Database (ETD)
and 8 light curves from the literature for the timing analysis of the exoplanet
TrES-5b. We have detected timing variations with a semi-amplitude of A ~ 0.0016
days and a period of P ~ 99 days. We carried out the N-body modeling based on
the three-body problem. The detected perturbation of TrES-5b may be caused by a
second exoplanet in the TrES-5 system. We have calculated the possible mass and
resonance of the object: M ~ 0.24MJup at a 1:2 Resonance.
