(Bloomberg) -- Roblox Corp., the video-game platform popular with preteens, is instituting a number of reforms following widespread criticism of its child-safety policies and the arrests of alleged child abusers using the service.

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Users under the age of 13 will need parental permission to access certain Roblox chat features, according to a copy of an email the company sent to parents this week. Kids under 9 will also need permission to play games with moderate violence or crude humor, according to the email, which was reviewed by Bloomberg News.

The video-game company, based in San Mateo, California, is also introducing a new type of account that will let parents monitor their child’s online activity and friends.

A Roblox spokesperson declined to share more information about the changes, which the company plans to implement next month.

The moves “are part of Roblox’s commitment to making the platform one of the safest online environments for our users, particularly the youngest users,” the company said in an emailed statement.

The changes follow Roblox’s July announcement that it would label games based on the type of content they contain, rather than by age.

Roblox’s child-safety policies have come under scrutiny in recent months. Since 2018, US police have arrested at least two dozen people who were accused of abusing or abducting victims they met or groomed on Roblox, according to a July Bloomberg Businessweek investigation. Some of those predators were already on sex-offender registries or had been accused of abusing minors offline. Roughly 40% of Roblox’s 80 million daily active accounts are under age 13.

Unlike competitors, Roblox until recently let children of any age establish accounts and talk to strangers. Child-safety advocates have criticized the ease with which kids on Roblox can chat with people they don’t know — an issue the changes may address. As of September, Roblox no longer lets children under age 5 set up accounts.

Following the Businessweek investigation, short seller Hindenburg Research published a report saying Roblox doesn’t do enough to stop child predators from accessing the platform. The report also accused Roblox of inflating its user numbers and time played, although some industry observers questioned that claim. Days earlier, short seller the Bear Cave issued a similar report alleging Roblox facilitated “widespread child abuse.”