Hello everyone, How to use ss2tf, if my state space equations consist's of both input and it's derivative

I got the following state-space matrices with 'u' and 'y' as input and output: x' = A*x + B*U ; y = C*x + D*U ; here U = [u ; u'] , x' is derivative of x, u' is derivative of u where the size of matrices are x'(5x1) ; x(5x1) ; A(5x5) ; B(5x2) ; U(2x1) ; C(1x5) ; D(1x2) ;