Overview of $C\!P$V parameter $\phi_{s}$ determination

The one of main goals of the LHCb experiment is the measurement of the mixing-induced $C\!P$-violating phase $\phi_{s}$ in the $B^{0}_{s}-\bar{B}^{0}_{s}$ system. It has been measured exploiting the Run~I data set, using several decay channels. The most recent results obtained analyzing $B^{0}_{s}\to J/\psi K^{+}K^{-}$ candidates in the $K^{+}K^{-}$ mass region above the $\phi(1020)$ resonance are presented. The measurements using the same final state with the $m(K^{+}K^{-})$ at the $\phi(1020)$ and $B^{0}_{s}\to J/\psi \pi^{+}\pi^{-}$, as well as using the $B^{0}_{s}\to \psi(2S)\phi$ decay are discussed.