Erlang/OTP 18.1 has been released

OTP 18.1 Readme File

OTP 18.1 Source File (65.0 MB)

OTP 18.1 Windows 32-bit Binary File (93.6 MB)

OTP 18.1 Windows 64-bit Binary File (94.1 MB)

OTP 18.1 HTML Documentation File (32.4 MB)

OTP 18.1 Man Pages File (1.3 MB)

Some highlights of the release are:

  • ssl: Add possibility to downgrade an SSL/TLS connection to a tcp connection, and give back the socket control to a user process.
  • ssh: The following new key exchange algorithms are implemented:'ecdh-sha2-nistp256', 'ecdh-sha2-nistp384', 'ecdh-sha2-nistp521','diffie-hellman-group14-sha1', 'diffie-hellman-group-exchange-sha1' and 'diffie-hellman-group-exchange-sha256'. This raises the security level considerably.

kernel,stdlib,sasl: A mechanism for limiting the amount of text that the built-in error logger events will produce has been introduced. It is useful for limiting both the size of log files and the CPU time used to produce them.
This mechanism is experimental in the sense that it may be changed based on feedback. See config parameter error_logger_format_depth in the Kernel application.

Additional Packages

Erlang/OTP is also distributed in pre built packages courtesy of Erlang Solutions.
There are pre built packages for platforms such as: Raspbian, Ubuntu, Fedora, OS X, and more!.
Erlang Solutions Downloads page


From OTP 18 and above, Erlang/OTP is distributed under Apache License 2.0. The previous versions are distributed under the Erlang Public License (EPL) that is a derivative work of the Mozilla Public License (MPL). It contains terms which differ from MPL, mainly in terms of jurisdiction. The license is constructed in accordance with the laws of Sweden.

To help you understand the legal text there is an EPL Translation. The legal text is the license, so if you have any doubts, refer to the legal text.

Available releases

PDF files are included in the Windows installer and in the HTML documentation tarballs, starting with the R13B03 release.

There is a file containing MD5 checksums for all files in the download directory, also reachable through rsync

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