Windows 10 Redstone 4 build 17133.73 now rolling out for Insiders

Insiders in the Fast, Slow, and Release Preview rings are today receiving the first cumulative update for Windows 10 Redstone 4. Today's cumulative update bumps the RTM build number to 17133.73, and is packing security updates and bug fixes.

Microsoft were originally rumoured to begin rolling out the Redstone 4 update to the public today, however it appears that will not be the case now. Instead, Microsoft is rolling out cumulative updates to those already running Redstone 4 via the Insider Program, giving the release a little more time to bake before general availability, which is always a good thing.

The update refers to itself as "Cumulative Update for Windows 10 Version Next (10.0.17133.73)", likely because Microsoft still hasn't announced an official name for Redstone 4. The changelog is below, so make sure you check for updates now!

  • Addresses a PDF security issue in Microsoft Edge.
  • Addresses an issue that, in some instances, prevents Internet Explorer from identifying custom controls.
  • Security updates to Internet Explorer, Microsoft Edge, Microsoft scripting engine, Windows kernel, Microsoft graphics component, Windows Server, Windows cryptography, and Windows datacenter networking.
Zac Bowden
Senior Editor

Zac Bowden is a Senior Editor at Windows Central. Bringing you exclusive coverage into the world of Windows on PCs, tablets, phones, and more. Also an avid collector of rare Microsoft prototype devices! Keep in touch on Twitter: @zacbowden.

  • Wow.. the Snipping Tool skills this young one posseses.
  • When it's going to be released in iso format
  • Windows 10 next version I like it 😊
  • Windows 10 Version Next...
  • So I got a "(2)" in the update history after installing. The history says "Cumulative Update for Windwos 10 Version Next (10.0.17133.73) (2)" - anybody knows what that means?
  • Just attempted to install this and has left me unable to boot.
  • 💩
  • Reboot to safe mode. If you ever get it running again, use this in an elevated cmd:
    bcdedit /set{deault} bootmenu policy legacy There is an article on the web telling how to do it with a recovery stick. repeat after each Windows Update.'s Windows Repair Pro has an automated tweak for that.
  • Why don't they just call it the Fluent (Design) Update? Jeez, how difficult is it to make a name? How many committees must it go through first?
  • Already installed through a cab file.
  • I was prepared to have the RS4 update ready for download on my PCs, even woke up early and everything. Will MS announce when RS4 will be released through Windows Update though?
  • It's usually released a week after the Release Preview Ring gets it.
  • wao .....
  • Has anyone noticed that the 450MB recovery partition shows up in Windows Explorer with a drive letter but when checking Disk management, there is no drive letter for it? Also a notification that the drive is running out of space? My pc is using a GPT partition type and I didn't see this but on two other machines with MBR disks I've seen this now