Recently I read an article pointing out that Aconcagua, being in an area along the Chile/Argentina border with very high seismic activity that generally has caused many of the nearby peaks to gain elevation, is probably higher than the currently accepted height of 6,962 meters (22,841 ft), which is somewhat higher than the last official measurement (in 1956) of 6,959 meters (22,831 feet).
In the article it mentions that an expedition is currently on the mountain attempting to use the latest technology to get an accurate measurement. There are a lot of reasons why both barometric and GPS based measurements can be inaccurate, so we’ll see. Interestingly, the second tallest peak in South America is also along the Chile/Argentina border, Ojos del Salado at 6,893 meters (22,615 ft) – less than 100 meters difference. Every few years some measurement comes up a couple hundred meters higher, making it the second highest peak in South America. This is a recently active volcano, considered the highest volcano on Earth, and is grouped in both The Second Seven Summits, and the Volcanic Seven Summits list.