We present here SPECULOOS, a new exoplanet transit search based on a network of 1m-class robotic telescopes targeting the $sim$1200 ultracool (spectral type M7 and later) dwarfs bright enough in the infrared ($K$-mag $leq 12.5$) to possibly enable the atmospheric characterization of temperate terrestrial planets with next-generation facilities like the $textit{James Webb Space Telescope}$. The ultimate goals of the project are to reveal the frequency of temperate terrestrial planets around the lowest-mass stars and brown dwarfs, to probe the diversity of their bulk compositions, atmospheres and surface conditions, and to assess their potential habitability.
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