Erlang/OTP 29.1 Released

erlangforums · September 16, 2026, 1:29pm

A new Erlang announcement has been posted:

OTP 29.1

Erlang/OTP 29.1 is the firest maintenance patch package for OTP 29, with mostly bug fixes as well as a few improvements.

POTENTIAL INCOMPATIBILITIES

When beam_lib returns an error tuple, the filename in the information tuple is now a list of characters instead of an atom.

Example:

1> beam_lib:chunks(code:which(lists), [“nope”]).
{error,beam_lib,
{missing_chunk,“…/git/otp/lib/stdlib/ebin/lists.beam”,
“nope”}}

The reason for this change is that a long file name is not guaranteed to fit in an atom. Applications or tools that do deep inspection of the beam_lib errors (not recommended) will need to be updated.

OTP-29.1

Improvements and New Features

A new versions module has been added to the runtime_tools application containing functions for, e.g., comparing, versions that adhere to the OTP Versions Scheme.

The documentation of the OTP Versions Scheme has also been improved.

Crypto

The documentation of the crypto module now contains runnable examples for most functions. The examples are verified by the crypto test suite, so they always match actual behavior.

Original announcement: