Methods, systems, and apparatuses for updating content data are described herein. A single manifest file may be maintained per content item and provided to client devices with an update file. The manifest file each client device receives may not initially facilitate output of content segments. Instead, the manifest file may be a partial manifest file that initializes playback and/or facilitates output of a most-recent content segment(s). The client devices may each determine a playback timeline. And each client device may use the corresponding update file to modify the manifest file based on the determined playback timeline, resulting in a modified manifest file that facilitates output of one or more content segments associated with the playback timeline for that particular client device.