"As the assembly session is not in progress, the government late last evening decided to bring an ordinance for repealing the existing rule related to reservation in promotions," a senior official told PTI.
The ordinance was sent to Governor Joshi last night itself for his assent to implement it immediately.
The government will later put the ordinance in the Vidhan Sabha, whose session is expected later this month, for making it a law.
The Supreme Court in its order last month upheld the High Court's order to scrap quota in promotions.
The legal battle on the issue had started soon after the Mayawati government took charge in 2007. The BSP government decided to implement the quota for SC/ST in recruitment as well as in promotions.
The decision of the state government will benefit about 16 lakh government employees awaiting promotions.