"further upgrading" is correct and usable in written English.
You can use it when referring to making additional improvements to something that was previously upgraded or built up. For example: Our software has been upgraded several times over the past few months, and we are now looking into further upgrading its security protocols.
Upgrade, 10 28 The Lib Dems's Caroline Pidgeon says: A staggering gap of £400 million exists between the Mayor's calculations and the true cost of further upgrading the Tube.
The small molecules produced through this route are amenable to the direct introduction to a petroleum refinery without further upgrading.
Enzymatic hydrolysis of the main components of lignocellulosic biomass is one of the promising methods to further upgrading it into biofuels.
To bypass expansive surface upgrading process, further upgrading of the heavy oil to almost light oil in situ in addition to thermal upgrading can be achieved by the catalytic layer incorporated to horizontal well section.
To demonstrate the further upgrading ability of CAPRI process after the thermal upgrading by THAI as obtained in the laboratory, the Petrobank Energy and Resource Ltd. successfully implemented a pilot field trial of the THAI CAPRI™ process at Whitesands near Conklin, Alberta, Canada (Petrobank 2010a, b).
Suggested alternative options, such as further upgrading the Bradley and buying currently available infantry fighting vehicles like the German Puma, were recommended as cost-saving measures.
Looking to the future, special operations capability could be further upgraded relative to the regular Army, which might be cut as part of a 'peace dividend'.
As a concession to Israel, the Palestinians will not ask the United Nations to further upgrade their status while negotiations are under way.
DODGERS SIGN LORETTA The Los Angeles Dodgers completed a one-year, $1.25 million contract with the free agent utility infielder Mark Loretta, helping further upgrade an infield that has been an off-season priority for the National League West champions.
The current technology at the Penang Port can be further upgraded to increase the efficiency of port operations.
With Windows 95 still the popular operating system for most portables, there is no reason to further upgrade most laptops.
