  We consider scalar-tensor theory for describing varying speed of light in a
spatially flat FRW space-time. We find some exact solutions in the metric and
Palatini formalisms. Also we examine the dynamics of this theory by dynamical
system method assuming a $\Lambda$CDM background and we find some exact
solutions by considering the character of critical points of the theory in both
formalisms. We show that for any attractor the form of non-minimal coupling
coefficient is quadratic in terms of the scalar field $\Psi$. Also we show that
only attractors of the de Sitter era satisfy the horizon criteria.
