On the first day of summer, with visions of nice weather ahead, there's nothing like higher gas prices to cool things down some. Prices increased overnight at South Shore pumps. The Utility and Review Board set the coming week's price for regular self-serve at $1.31.7 per liter. That is an increase of almost 3 cents from yesterday. There is no change though in the price of diesel. Its selling today at $1.29.4 per liter.