The Automated Trading System (ATS) version 7.18 and the new central depository system will be implemented with effect from next Monday, the stock exchange said.
The exchange added that all carried forward orders remaining in the ATS will be purged and therefore will not be available in the upgraded ATS version.
Broker firms are requested to re-enter such orders into the ATS on Monday.
The pre-open will be extended up to 9.45 a.m. on 17th November 2014.
The Colombo benchmark All Share Price Index closed 21.40 points higher at 7,501.09, up 0.29 percent.
The S&P SL20 closed 11.96 points higher at 4,155.82, up 0.29 percent.
Turnover was 2.40 billion rupees, down from 4.08 billion rupees a day earlier with 115 stocks closed positive against 104 negative.
The aggregate value of all off-the-floor deals represented 11 percent of the daily turnover.
Union Bank of Colombo closed 1.30 rupees higher at 26.10 rupees and Access Engineering closed 90 cents higher at 39.90 rupees, attracting most number of trades during the day.
Foreign investors bought 446.77 million rupees worth shares while selling 253.99 million rupees worth shares.
Lanka Orix Leasing Company closed 5.00 rupees higher at 93.00 rupees and Vallibel One closed 1.50 rupees higher at 26.20 rupees, contributing most to the index gain.
Chevron Lubricants Lanka closed 10.00 rupees higher at 359.90 rupees.