What’s new in 3.4

Version 3.4 of the Montreal Forced Aligner introduces a new model format to allow for distribution via Hugging Face. See MFA model versions for more details on the changes and how to use and distribute these models.

Additionally, MFA-trained tokenizers are being deprecated and will be removed in MFA 4.0, as the language-specific tokenization in training has yielded much better and consistent results (see Language tokenization for more details).

Finally, a new MFA paper reflecting the updates over the past 10 years along with benchmarks with recent and other widely-used aligners across three languages will be presented at Interspeech 2026! See Citation for more details on the updated citation.