"Unable to download the launcher update. Launching previous version..."

Every time I try to launch minecraft, it starts updating the launcher but quickly pops up with "Unable to download the launcher update. Launching previous version..." I'm not able to update my launcher past v2.21.26-1.7.2, so have to close out of that every time I start Minecraft. I've looked across bug reports and forums, but haven't found a solution to my issue. I've had this for about a month now.