Unable to update repository attributes in BB Cloud

calling:

curl -ikL -X PUT -d '

' -u '<user>:<pass>' -H 'Content-Type: application/json' https://api.bitbucket.org/2.0/repositories/<user>/<repo-slug>

HTTP/2 200
server: nginx
vary: Authorization
vary: Accept-Encoding
bbr1repouuid: xxxxxxxxxxxxxxxx
content-type: application/json; charset=utf-8
strict-transport-security: max-age=31536000; includeSubDomains; preload
date: Mon, 15 Oct 2018 20:15:36 GMT
x-served-by: app-142
etag: "xxxxxxxxxxxxxxxxxxxxxx"
x-static-version: xxxxxxxxxxxx
x-content-type-options: nosniff
x-accepted-oauth-scopes: repository:admin
x-credential-type: password
x-render-time: 0.408793926239
x-request-count: 32
x-frame-options: SAMEORIGIN
x-version: 5768d0527537
content-length: 2496

The "updated_on" attribute updates, but nothing else. I've also tried updating the "is_private" attribute and have the same issue.