  New renormalisation group flows of three-dimensional Chern--Simons theories
with a single gauge group $\textrm{SU}(N)$ and adjoint matter are found
holographically. These RG flows have an infrared fixed point given by a CFT
with $\mathcal{N}=3$ supersymmetry and $\text{SU}(2)$ flavour symmetry. The
ultraviolet fixed point is again described by a CFT with either $\mathcal{N}=2$
and $\text{SU}(3)$ symmetry or $\mathcal{N}=1$ and $\text{G}_{2}$ symmetry. The
gauge/gravity duals of these RG flows are constructed as domain-wall solutions
of a gauged supergravity model in four dimensions that enjoys an embedding into
massive IIA supergravity. A concrete RG flow that brings a mass deformation of
the $\mathcal{N}=2$ CFT into the $\mathcal{N}=3$ CFT at low energies is
described in detail.
