Left. Stacked CMB κ profiles measured for 3D voids in the WebSky and the WISE-PS1 datasets. We generally split the all-voids sample into voids-in-voids (λ_v <  −3.72) and voids-in-clouds (λ >  12.58) bins, which are expected to carry most of the observable void lensing signal among all λ_v values. Right. We show the best-fit A_κ parameters for different cases. The main results are A_κ ≈ 0.81 ± 0.12 for voids-in-voids and A_κ ≈ 0.86 ± 0.12 for voids-in-clouds, both with S/N ≈ 7. Splitting the voids into three redshift bins using a △z ≈ 0.1 width for both voids-in-voids and voids-in-clouds presents a weak trend for stronger signals at higher redshifts.