The Hybridization of carbon in Methanone  is

methanone is $\mathrm{H}-\stackrel{\stackrel{\mathrm{O}}{\left|\right|}}{\mathrm{C}}-\mathrm{H}$

 we know that if

all bonds are single or sigma, the hybridization is sp³

all bonds are single and one pie or positive, the hybridization is sp²

all bonds are single and two pie , the hybridization is sp