The app advises users to self-isolate if they come into contact with someone who has tested positive for coronavirus.
A record number received notifications in the week up to July 2, in what has been dubbed the 'pingdemic'.
A total of 1,957 contact tracing alerts were sent to Peterborough residents via the NHS Covid-19 app in the seven days to July 21.
That is almost 500 more than the previous week prior, when 1,492 alerts were sent.
But the Department for Health has announced the system's "logic" is set to be tweaked.
It means a person will need to have been near a positive but asymptomatic individual two days prior, instead of five.
Neither the app's sensitivity or risk threshold have been altered.
With several industries complaining recently of staff shortages due to a growing number of pings, it is hoped pressure will now be alleviated.
Health secretary Sajid Javid said: "We want to reduce the disruption that self-isolation can cause for people and businesses while ensuring we're protecting those most at risk from this virus.
"This update will help ensure that we are striking the right balance.
"It's so important that people isolate when asked to do so in order to stop the spread of the virus and protect their communities."