Shares of Gujarat Gas Limited (GGL) climbed 4 per cent to Rs 232 on the BSE on Friday after the rating agency Crisil upgraded its rating on the long-term bank facilities of the company to 'AA+' with a 'stable' outlook from 'AA' with a 'positive' outlook. In its rating rationale, Crisil said it believes GGL will continue to depict a steady growth in operating performance, backed by healthy volume growth and stable realisation levels.