Find the OS X version and build number on your Mac

These numbers can help you learn whether OS X is up to date on your Mac. When you install an OS X update or upgrade, you get a new version and build number.

Check About this Mac

From the Apple menu, choose About This Mac. The version of OS X installed appears directly below “OS X.” Click the version number to see the build number. You can also use System Information to find these numbers.

About this Mac (Yosemite)
About This Mac in OS X Yosemite, showing the version number and build number

About this Mac (Mavericks)
About This Mac in OS X Mavericks, showing the build number

List of build numbers

These are the build numbers of OS X versions that are available as software updates or upgrades. The build number of the version of OS X included with some Macs might differ from these, even if the version number is the same.

OS X Yosemite

OS X Yosemite v10.10.5 Build 14F27
OS X Yosemite v10.10.4 Build 14E46
OS X Yosemite v10.10.3
with supplemental update
Build 14D136
OS X Yosemite v10.10.2 Build 14C109
OS X Yosemite v10.10.1 Build 14B25
OS X Yosemite v10.10 Build 14A389

OS X Mavericks

OS X Mavericks v10.9.5 Build 13F34
OS X Mavericks v10.9.4 Build 13E28
OS X Mavericks v10.9.3 Build 13D65
OS X Mavericks v10.9.2 Build 13C64
OS X Mavericks v10.9.1 Build 13B42
OS X Mavericks v10.9 Build 13A603

OS X Mountain Lion and Lion

OS X Mountain Lion v10.8.5 Build 12F371, 12F45 or 12F20292
OS X Mountain Lion v10.8.5 Build 12F371
OS X Mountain Lion v10.8.4 Build 12E55
OS X Mountain Lion v10.8.3 Build 12D78
OS X Mountain Lion v10.8.2 Build 12C543, 12C60, or 12C20344
OS X Mountain Lion v10.8.1 Build 12B19
OS X Mountain Lion Build 12A269
OS X Lion v10.7.5 Build 11G565 or 11G63
OS X Lion v10.7 Build 11A511
  1. If you have Mountain Lion v10.8.5 (build 12F37), you can install OS X v10.8.5 Supplemental Update to get OS X v10.8.5 (build 12F45).
  2. Build 12F2029 is available for the iMac (21.5-inch, Late 2013) with NVIDIA GeForce GT 750M only.
  3. If you have Mountain Lion v10.8.2 (build 12C54), you can install OS X v10.8.2 Supplemental Update 1.0 to get OS X v10.8.2 (build 12C60).
  4. Build 12C2034 is available for certain Macs only. It's installed by the OS X 10.8.2 Update for 13" MacBook Pro with Retina Display, 21.5" iMac (Late 2012), and Mac mini (Late 2012).
  5. If you have OS X Lion v10.7.5 (build 11G56), you can install Mac OS X v10.7.5 Supplemental Update to get OS X v10.7.5 (build 11G63).

OS X Snow Leopard and earlier

Mac OS X v10.6.8 Build 10K540 or 10K549
Mac OS X v10.5.8 Build 9L30, or 9L34 for Server 10.5.8 v1.1
Mac OS X v10.4.11 Build 8S165
Mac OS X v10.4 Tiger installation disc Build 8A428
Mac OS X v10.3.9 Build 7W98
Mac OS X v10.3.2 installation disc Build 7D28
Mac OS X v10.3 Panther installation disc Build 7B85
Mac OS X v10.2.8 Build 6R65 or 6R73
Mac OS X v10.2.3 installation disc Build 6G37, 6G35 for Server
Mac OS X v10.2 Jaguar installation disc Build 6C115
Mac OS X v10.1.5 Build 5S60 (5S66 with Networking Update 1.0)
Mac OS X v10.1 Puma installation disc Build 5G64 (5L14 or 5L17b with Security Update 10-19-01)
Mac OS X v10.0 Cheetah installation disc Build 4K78

Retail installation disc build numbers

Mac OS X v10.6.3 Install DVD Build 10D575
Mac OS X v10.6 Snow Leopard Install DVD Build 10A432, build 10A433 for Server
Mac OS X v10.5.6 Install DVD Build 9G66
Mac OS X v10.5 Leopard Install DVD Build 9A581
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