  We report results from the first measurements of the CKM angle $\gamma$ using
$B\rightarrow DK$ decays with the LHCb experiment. Three well established
methods are used to extract the CP observables. The updated measurement of
$\gamma$ in the three-body $D^0$ Dalitz space results in $\gamma = (57\pm
16)^\circ$. When combining the observables from all \bdk studies, the best fit
value for $\gamma \in [0,180]^\circ$ is $\gamma = 67.2^\circ$ with $\gamma \in
[55.1,79.1]^\circ$ at 68%CL and $\gamma \in [43.9, 89.5]^\circ$ at 95%CL. This
represents the most precise $\gamma$ values directly measured by a single
experiment. Furthermore, a new time-dependent approach using $B_s \rightarrow
D_s K$ decays is used for the first time to measure CP observables and future
prospects for $\gamma$ at LHCb are given.
