path: root/Misc/NEWS.d/next/Library/2021-05-16-00-00-38.bpo-44145.ko5SJ7.rst

:mod:`hmac` computations were not releasing the GIL while calling the
OpenSSL ``HMAC_Update`` C API (a new feature in 3.9).  This unintentionally
prevented parallel computation as other :mod:`hashlib` algorithms support.