The new corridor extends from 33.30 to 40.30 roubles to the dollar-euro currency basket as of Jan. 17, compared to 33.25-40.25 previously.
Under its managed float, the central bank increases its interventions as the rouble approaches the boundary of the corridor. Once an intervention allotment of $350 million is exhausted it automatically shifts the corridor.
The rouble was trading at 38.96 against the basket at 0610 GMT.