# CFBundleGetVersionNumber(_:) Returns a bundle’s version number. ``` func CFBundleGetVersionNumber(_ bundle: CFBundle!) -> UInt32 ``` ## Parameters `bundle` The bundle to examine. The bundle’s version number can be number or a string of the standard form “2.5.3d5”. ## Return Value A `vers` resource style version number. If it is a string, it is automatically converted to the numeric representation, where the major version number is restricted to 2 BCD digits (in other words, it must be in the range 0-99) and the minor and bug fix version numbers are each restricted to a single BCD digit (0-9). ## Discussion This function is only supported for the `vers` resource style version numbers. Where other version number styles—namely X, or X.Y, or X.Y.Z—are used, you can use [`CFBundleGetValueForInfoDictionaryKey(_:_:)`](/documentation/CoreFoundation/CFBundleGetValueForInfoDictionaryKey(_:_:)) with the key `kCFBundleVersionKey` to extract the version number as a string from the bundle’s information dictionary. Some version numbers of the form X, X.Y, and X.Y.Z may work with this function, if X <= 99, Y <= 9, and Z <= 9. Thus a version number 76.5.4 will work, but 76.12 will not work. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)