The Justice Secretary Liz Truss says improvements are starting to be made at Bedford Prison after a riot took place there earlier this month.
The MP for South West Norfolk spoke during a visit to see a work experience project at Norwich Prison.
Truss told ITV News Anglia that more staff have been recruited and body worn cameras are being rolled out.
Inmates who were involved in the six-hour riot were protesting at the conditions in the jail.
"There are issues across the prison estate, but what we've done, we've trained up new sniffer dogs in detecting psychoactive substances, we're rolling out body-worn cameras across the estate, investing in more frontline staff," Truss said.
"I announced earlier this year that we were recruiting an additional 400 staff in our most challenging prisons and we've now reached half of that target, so we are making progress."