Supported Mac OSX Operating Systems

The latest CASA 5.7/6.1 release is available!

CASA is releasing version 6.1 (Python 3) and CASA 5.7 (Python 2) simultaneously. The task and tools functionality of CASA 6.1 and 5.7 are scientifically equivalent, but CASA 6.1 can optionally be downloaded through pip-install on Linux. When using the tar-file distribution (with Python environment included) from the download below, either of the two CASA versions should run on the supported Mac OSs.

CASA 5.7/6.1 is supported on the following Mac operating systems: Only the Mac OSX versions listed above are officially supported by CASA, because these we run regular tests on. In addition, the CASA team supports LINUX RedHat.

Manual processing can be done with any of the versions below, but the ALMA and VLA pipelines may differ and are not always included in the official CASA releases. Please ensure to download the correct CASA version for running a pipeline.

CASA 5.7 / 6.1

   Mac OSX 10.15 (6.1.2)   |   Mac OSX 10.14 (6.1.2)   |   Mac OSX 10.15 (5.7.2)   |   Mac OSX 10.14 (5.7.2)

(Versions 6.1.2-7 and 5.7.2-4. CASA 6.1.2 includes a pipeline validated for VLA, CASA 5.7.2 does not include any pipeline)
ALMA pipeline with CASA 5.6

   Mac OSX 10.14   |   Mac OSX 10.13

(Version CASA 5.6.1-8, with ALMA pipeline version number 42866)

VLA pipeline with CASA 6.1

   Mac OSX 10.15   |   Mac OSX 10.14

(Version CASA 6.1.2-7, with VLA pipeline version number 2020.1.0.36)

The above CASA versions can also be downloaded from our NAOJ CASA mirror site and NAOJ CASA-pipeline mirror site, or via Google Drive.

Release Information

The Release Notes and Known Issues of the 5.7/6.1 release are available in


Detailed instructions on how to install CASA, both regarding the downloadable tar-file and pip-wheel installation for CASA 6, can be found on the Installation pages of CASA Docs

OS X users should be aware that it may be necessary to temporarily bypass Apple's Gatekeeper security system to run CASA for the first time after downloading it. This can be done by using "Ctrl+click" on the downloaded application file and selecting "Open" from the contextual menu. Details can be found here.

Older Mac Releases

MacOS 10.15 (CASA 5.7.0/6.1.0)
MacOS 10.14 (CASA 5.5-6.1.0)
MacOS 10.13 (CASA 5.3-5.6.0)
MacOS 10.12 (CASA 5.0-5.4.2)
MacOS 10.11 (CASA 4.6-5.1.2)
MacOS 10.10 (CASA 4.4 - 4.7)
MacOS 10.9 (CASA 4.4 - 4.5)
MacOS 10.8 (4.3); OSX 10.8 (<=4.2.2)
MacOS 10.7
MacOS 10.6
MacOS 10.5

Mac Pipeline Releases (5.6+):

CASA 5.6.1 (MacOS 10.15 - MacOS 10.14 - MacOS 10.13)

Release information for previous casa versions can be found in