Erlang/OTP 19.1 is a service release containing mostly bug fixes, as well as a number of new features and characteristics improvements.

OTP 19.1 Readme File

OTP 19.1 Source File (100756909)

OTP 19.1 Windows 32-bit Binary File (100756909)

OTP 19.1 Windows 64-bit Binary File (101629312)

OTP 19.1 HTML Documentation File (34624316)

OTP 19.1 Man Pages File (1405580)

Some highlights of the release are:

  • erts: Improved dirty scheduler support. A purge of a module will not have to wait for completion of all ongoing dirty NIF calls.
  • erts: Improved accuracy of timeouts on MacOS X.
  • kernel: Add net_kernel:setopts/2 and net_kernel:getopts/2 to control options for distribution sockets in runtime.
  • asn1: Compiling multiple ASN.1 modules in the same directory with parallel make (make -j) should now be safe.
  • httpd: support for PUT and DELETE in mod_esi
  • ~30 contributions since 19.0

You can find the Release Notes with more detailed info at

You can download the full source distribution from

Note: To unpack the TAR archive you need a GNU TAR compatible program. For installation instructions please read the README that is part of the distribution.

You can also find the source code at in the official Erlang repository. Git tag OTP-19.1

The Windows binary distributions can be downloaded from

You can also download the complete HTML documentation or the Unix manual files

You can also read the documentation on-line here:
(see the Release Notes mentioned above for release notes which
are not updated in the doc, but the new functionality is)

We also want to thank those that sent us patches, suggestions and bug reports.

If you find bugs in Erlang/OTP report them via the public issue tracker at

The Erlang/OTP Team at Ericsson

Compiling Erlang from source

You can build Erlang from source on your own, following the building and installation instructions. Or use the Kerl script. Kerl is a script that lets you easily build Erlang with a few commands. Follow the instructions to build.

Finding a source version

Follow this link that presents all released source versions, a link to the GitHub source tag, and to the README.

Pre-built Binary Packages

Most OS package managers provide pre-built binary packages. You can also download the latest stable releases from Erlang Solutions. Erlang Solutions provides pre-built binary packages for OS X, Windows, Ubuntu, Debian, Fedora, CentOS, Raspbian and other operating systems. 

  • For Homebrew on OS X: brew install erlang
  • For MacPorts on OS X: port install erlang
  • For Ubuntu and Debianapt-get install erlang
  • For Fedorayum install erlang
  • For FreeBSDpkg install erlang


Since OTP 18.0, Erlang/OTP is released under Apache License 2.0. The older releases prior to 18.0 were released under Erlang Public License (EPL), a derivative work of the Mozilla Public License (MPL).