OTP 17.1 has been released!

OTP 17.1 Readme File

OTP 17.1 Source File (63.8 MB)

OTP 17.1 Windows 32-bit Binary File (90.7 MB)

OTP 17.1 Windows 64-bit Binary File (91.8 MB)

OTP 17.1 HTML Documentation File (31.8 MB)

OTP 17.1 Man Pages File (1.2 MB)

Erlang/OTP 17.1 is a service release on the 17 track with mostly bug fixes, but is does contain a number of new features and characteristics improvements as well.

Some highlights of the release are:

  • crypto: Add aes_cfb8 cypher to crypto:block_encrypt and block_decrypt.
  • diameter: Add result code counters for CEA, DWA, and DPA.
  • erts: The following built in functions in the erlang and binary modules now bump an appropriate amount
    of reductions and yield when out of reductions:
    binary_to_list/1, binary_to_list/3, bitstring_to_list/1, list_to_binary/1,
    iolist_to_binary/1, list_to_bitstring/1, binary:list_to_bin/1
  • hipe: Handle Maps instructions get_map_elements, put_map_assoc,
    put_map_exact in the HiPE native code compiler.
  • mnesia: The time for inserting locks for a transaction with large
    number of locks is reduced significantly.
  • ssh: Option max_sessions added to ssh:daemon/{2,3}.
  • stdlib: Add maps:get/3 to maps module. The function will return the
    supplied default value if the key does not exist in the map.

Many thanks to 24 different contributors in this release

You can find more detailed info in the README.

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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