The dimensions of capacitance are :

C = $\frac{Q}{V}$

C = $\frac{Q}{W / Q}=\frac{Q^2 \times T^2}{W \times T^2}=\frac{T^2}{W^2} I^2$

$=\frac{T^2I^2}{M L^2 T^{-2}}$

= M^-1L^-2T⁴I²