CHANGELOG.md

Changelog

3.11.7 - 2026-02-02

Changed

• Use a faster library to serialize float. Users with byte-exact regression tests should note positive exponents are now written using a +, e.g., 1.2e+30 instead of 1.2e30. Both formats are spec-compliant.
• ABI compatibility with CPython 3.15 alpha 5 free-threading.

3.11.6 - 2026-01-29

Changed

• orjson now includes code licensed under the Mozilla Public License 2.0 (MPL-2.0).
• Drop support for Python 3.9.
• ABI compatibility with CPython 3.15 alpha 5.
• Build now depends on Rust 1.89 or later instead of 1.85.

Fixed

• Fix sporadic crash serializing deeply nested list of dict.

3.11.5 - 2025-12-06

Changed

• Show simple error message instead of traceback when attempting to build on unsupported Python versions.

3.11.4 - 2025-10-24

Changed

• ABI compatibility with CPython 3.15 alpha 1.
• Publish PyPI wheels for 3.14 and manylinux i686, manylinux arm7, manylinux ppc64le, manylinux s390x.
• Build now requires a C compiler.

3.11.3 - 2025-08-26

Fixed

• Fix PyPI project metadata when using maturin 1.9.2 or later.

3.11.2 - 2025-08-12

Fixed

• Fix build using Rust 1.89 on amd64.

Changed

• Build now depends on Rust 1.85 or later instead of 1.82.

3.11.1 - 2025-07-25

Changed

• Publish PyPI wheels for CPython 3.14.

Fixed

• Fix str on big-endian architectures. This was introduced in 3.11.0.

3.11.0 - 2025-07-15

Changed

• Use a deserialization buffer allocated per request instead of a shared buffer allocated on import.
• ABI compatibility with CPython 3.14 beta 4.

3.10.18 - 2025-04-29

Fixed

• Fix incorrect escaping of the vertical tabulation character. This was introduced in 3.10.17.

3.10.17 - 2025-04-29

Changed

• Publish PyPI Windows aarch64/arm64 wheels.
• ABI compatibility with CPython 3.14 alpha 7.
• Fix incompatibility running on Python 3.13 using WASM.

3.10.16 - 2025-03-24

Changed

• Improve performance of serialization on amd64 machines with AVX-512.
• ABI compatibility with CPython 3.14 alpha 6.
• Drop support for Python 3.8.
• Publish additional PyPI wheels for macOS that target only aarch64, macOS 15, and recent Python.

3.10.15 - 2025-01-08

Changed

• Publish PyPI manylinux aarch64 wheels built and tested on aarch64.
• Publish PyPI musllinux aarch64 and arm7l wheels built and tested on aarch64.
• Publish PyPI manylinux Python 3.13 wheels for i686, arm7l, ppc64le, and s390x.

3.10.14 - 2024-12-29

Changed

• Specify build system dependency on maturin>=1,<2 again.
• Allocate memory using PyMem_Malloc() and similar APIs for integration with pymalloc, mimalloc, and tracemalloc.
• Source distribution does not ship compressed test documents and relevant tests skip if fixtures are not present.
• Build now depends on Rust 1.82 or later instead of 1.72.

3.10.13 - 2024-12-29

Changed

• Fix compatibility with maturin introducing a breaking change in 1.8.0 and specify a fixed version of maturin. Projects relying on any previous version being buildable from source by end users (via PEP 517) must upgrade to at least this version.

3.10.12 - 2024-11-23

Changed

• Publish PyPI manylinux i686 wheels.
• Publish PyPI musllinux i686 and arm7l wheels.
• Publish PyPI macOS wheels for Python 3.10 or later built on macOS 15.
• Publish PyPI Windows wheels using trusted publishing.

3.10.11 - 2024-11-01

Changed

• Improve performance of UUIDs.
• Publish PyPI wheels with trusted publishing and PEP 740 attestations.
• Include text of licenses for vendored dependencies.

3.10.10 - 2024-10-22

Fixed

• Fix int serialization on s390x. This was introduced in 3.10.8.

Changed

• Publish aarch64 manylinux_2_17 wheel for 3.13 to PyPI.

3.10.9 - 2024-10-19

Fixed

• Fix int serialization on 32-bit Python 3.8, 3.9, 3.10. This was introduced in 3.10.8.

3.10.8 - 2024-10-19

Changed

• int serialization no longer chains OverflowError to the the __cause__ attribute of orjson.JSONEncodeError when range exceeded.
• Compatibility with CPython 3.14 alpha 1.
• Improve performance.

3.10.7 - 2024-08-08

Changed

• Improve performance of stable Rust amd64 builds.

3.10.6 - 2024-07-02

Changed

• Improve performance.

3.10.5 - 2024-06-13

Changed

• Improve performance.

3.10.4 - 2024-06-10

Changed

• Improve performance.

3.10.3 - 2024-05-03

Changed

• manylinux amd64 builds include runtime-detected AVX-512 str implementation.
• Tests now compatible with numpy v2.

3.10.2 - 2024-05-01

Fixed

• Fix crash serializing str introduced in 3.10.1.

Changed

• Improve performance.
• Drop support for arm7.

3.10.1 - 2024-04-15

Fixed

• Serializing numpy.ndarray with non-native endianness raises orjson.JSONEncodeError.

Changed

• Improve performance of serializing.

3.10.0 - 2024-03-27

Changed

• Support serializing numpy.float16 (numpy.half).
• sdist uses metadata 2.3 instead of 2.1.
• Improve Windows PyPI builds.

3.9.15 - 2024-02-23

Fixed

• Implement recursion limit of 1024 on orjson.loads().
• Use byte-exact read on str formatting SIMD path to avoid crash.

3.9.14 - 2024-02-14

Fixed

• Fix crash serializing str introduced in 3.9.11.

Changed

• Build now depends on Rust 1.72 or later.

3.9.13 - 2024-02-03

Fixed

• Serialization str escape uses only 128-bit SIMD.
• Fix compatibility with CPython 3.13 alpha 3.

Changed

• Publish musllinux_1_2 instead of musllinux_1_1 wheels.
• Serialization uses small integer optimization in CPython 3.12 or later.

3.9.12 - 2024-01-18

Changed

• Update benchmarks in README.

Fixed

• Minimal musllinux_1_1 build due to sporadic CI failure.

3.9.11 - 2024-01-18

Changed

• Improve performance of serializing. str is significantly faster. Documents using dict, list, and tuple are somewhat faster.

3.9.10 - 2023-10-26

Fixed

• Fix debug assert failure on 3.12 --profile=dev build.

3.9.9 - 2023-10-12

Changed

• orjson module metadata explicitly marks subinterpreters as not supported.

3.9.8 - 2023-10-10

Changed

• Improve performance.
• Drop support for Python 3.7.

3.9.7 - 2023-09-08

Fixed

• Fix crash in orjson.loads() due to non-reentrant handling of persistent buffer. This was introduced in 3.9.3.
• Handle some FFI removals in CPython 3.13.

3.9.6 - 2023-09-07

Fixed

• Fix numpy reference leak on unsupported array dtype.
• Fix numpy.datetime64 reference handling.

Changed

• Minor performance improvements.

3.9.5 - 2023-08-16

Fixed

• Remove futex from module import and initialization path.

3.9.4 - 2023-08-07

Fixed

• Fix hash builder using default values.
• Fix non-release builds of orjson copying large deserialization buffer from stack to heap. This was introduced in 3.9.3.

3.9.3 - 2023-08-06

Fixed

• Fix compatibility with CPython 3.12.

Changed

• Support i686/x86 32-bit Python installs on Windows.

3.9.2 - 2023-07-07

Fixed

• Fix the __cause__ exception on orjson.JSONEncodeError possibly being denormalized, i.e., of type str instead of Exception.

3.9.1 - 2023-06-09

Fixed

• Fix memory leak on chained tracebacks of exceptions raised in default. This was introduced in 3.8.12.

3.9.0 - 2023-06-01

Added

• orjson.Fragment includes already-serialized JSON in a document.

3.8.14 - 2023-05-25

Changed

• PyPI manylinux wheels are compiled for x86-64 instead of x86-64-v2.

3.8.13 - 2023-05-23

Changed

• Source distribution contains all source code required for an offline build.
• PyPI macOS wheels use a MACOSX_DEPLOYMENT_TARGET of 10.15 instead of 11.
• Build uses maturin v1.

3.8.12 - 2023-05-07

Changed

• Exceptions raised in default are now chained as the __cause__ attribute on orjson.JSONEncodeError.

3.8.11 - 2023-04-27

Changed

• orjson.loads() on an empty document has a specific error message.
• PyPI manylinux_2_28_x86_64 wheels are compiled for x86-64-v2.
• PyPI macOS wheels are only universal2 and compiled for x86-64-v2 and apple-m1.

3.8.10 - 2023-04-09

Fixed

• Fix compatibility with CPython 3.12.0a7.
• Fix compatibility with big-endian architectures.
• Fix crash in serialization.

Changed

• Publish musllinux 3.11 wheels.
• Publish s390x wheels.

3.8.9 - 2023-03-28

Fixed

• Fix parallel initialization of orjson.

3.8.8 - 2023-03-20

Changed

• Publish ppc64le wheels.

3.8.7 - 2023-02-28

Fixed

• Use serialization backend introduced in 3.8.4 only on well-tested platforms such as glibc, macOS by default.

3.8.6 - 2023-02-09

Fixed

• Fix crash serializing when using musl libc.

Changed

• Make python-dateutil optional in tests.
• Handle failure to load system timezones in tests.

3.8.5 - 2023-01-10

Fixed

• Fix orjson.dumps() invalid output on Windows.

3.8.4 - 2023-01-04

Changed

• Improve performance.

3.8.3 - 2022-12-02

Fixed

• orjson.dumps() accepts option=None per Optional[int] type.

3.8.2 - 2022-11-20

Fixed

• Fix tests on 32-bit for numpy.intp and numpy.uintp.

Changed

• Build now depends on rustc 1.60 or later.
• Support building with maturin 0.13 or 0.14.

3.8.1 - 2022-10-25

Changed

• Build maintenance for Python 3.11.

3.8.0 - 2022-08-27

Changed

• Support serializing numpy.int16 and numpy.uint16.

3.7.12 - 2022-08-14

Fixed

• Fix datetime regression tests for tzinfo 2022b.

Changed

• Improve performance.

3.7.11 - 2022-07-31

Fixed

• Revert dict iterator implementation introduced in 3.7.9.

3.7.10 - 2022-07-30

Fixed

• Fix serializing dict with deleted final item. This was introduced in 3.7.9.

3.7.9 - 2022-07-29

Changed

• Improve performance of serializing.
• Improve performance of serializing pretty-printed (orjson.OPT_INDENT_2) to be much nearer to compact.
• Improve performance of deserializing str input.
• orjson now requires Rust 1.57 instead of 1.54 to build.

3.7.8 - 2022-07-19

Changed

• Build makes best effort instead of requiring "--features".
• Build using maturin 0.13.

3.7.7 - 2022-07-06

Changed

• Support Python 3.11.

3.7.6 - 2022-07-03

Changed

• Handle unicode changes in CPython 3.12.
• Build PyPI macOS wheels on 10.15 instead of 12 for compatibility.

3.7.5 - 2022-06-28

Fixed

• Fix issue serializing dicts that had keys popped and replaced. This was introduced in 3.7.4.

3.7.4 - 2022-06-28

Changed

• Improve performance.

Fixed

• Fix deallocation of orjson.JSONDecodeError.

3.7.3 - 2022-06-23

Changed

• Improve build.
• Publish aarch64 musllinux wheels.

3.7.2 - 2022-06-07

Changed

• Improve deserialization performance.

3.7.1 - 2022-06-03

Fixed

• Type stubs for orjson.JSONDecodeError now inherit from json.JSONDecodeError instead of ValueError
• Null-terminate the internal buffer of orjson.dumps() output.

3.7.0 - 2022-06-03

Changed

• Improve deserialization performance significantly through the use of a new backend. PyPI wheels for manylinux_2_28 and macOS have it enabled. Packagers are advised to see the README.

3.6.9 - 2022-06-01

Changed

• Improve serialization and deserialization performance.

3.6.8 - 2022-04-15

Fixed

• Fix serialization of numpy.datetime64("NaT") to raise on an unsupported type.

3.6.7 - 2022-02-14

Changed

• Improve performance of deserializing almost-empty documents.
• Publish arm7l manylinux_2_17 wheels to PyPI.
• Publish amd4 musllinux_1_1 wheels to PyPI.

Fixed

• Fix build requiring python on PATH.

3.6.6 - 2022-01-21

Changed

• Improve performance of serializing datetime.datetime using tzinfo that are zoneinfo.ZoneInfo.

Fixed

• Fix invalid indexing in line and column number reporting in JSONDecodeError.
• Fix orjson.OPT_STRICT_INTEGER not raising an error on values exceeding a 64-bit integer maximum.

3.6.5 - 2021-12-05

Fixed

• Fix build on macOS aarch64 CPython 3.10.
• Fix build issue on 32-bit.

3.6.4 - 2021-10-01

Fixed

• Fix serialization of dataclass inheriting from abc.ABC and using __slots__.
• Decrement refcount for numpy PyArrayInterface.
• Fix build on recent versions of Rust nightly.

3.6.3 - 2021-08-20

Fixed

• Fix build on aarch64 using the Rust stable channel.

3.6.2 - 2021-08-17

Changed

• orjson now compiles on Rust stable 1.54.0 or above. Use of some SIMD usage is now disabled by default and packagers are advised to add --cargo-extra-args="--features=unstable-simd" to the maturin build command if they continue to use nightly.
• orjson built with --features=unstable-simd adds UTF-8 validation implementations that use AVX2 or SSE4.2.
• Drop support for Python 3.6.

3.6.1 - 2021-08-04

Changed

• orjson now includes a pyi type stubs file.
• Publish manylinux_2_24 wheels instead of manylinux2014.

Fixed

• Fix compilation on latest Rust nightly.

3.6.0 - 2021-07-08

Added

• orjson.dumps() serializes numpy.datetime64 instances as RFC 3339 strings.

3.5.4 - 2021-06-30

Fixed

• Fix memory leak serializing datetime.datetime with tzinfo.
• Fix wrong error message when serializing an unsupported numpy type without default specified.

Changed

• Publish python3.10 and python3.9 manylinux_2_24 wheels.

3.5.3 - 2021-06-01

Fixed

• orjson.JSONDecodeError now has pos, lineno, and colno.
• Fix build on recent versions of Rust nightly.

3.5.2 - 2021-04-15

Changed

• Improve serialization and deserialization performance.
• orjson.dumps() serializes individual numpy.bool_ objects.

3.5.1 - 2021-03-06

Changed

• Publish universal2 wheels for macOS supporting Apple Silicon (aarch64).

3.5.0 - 2021-02-24

Added

• orjson.loads() supports reading from memoryview objects.

Fixed

• datetime.datetime and datetime.date zero pad years less than 1000 to four digits.
• sdist pins maturin 0.9.0 to avoid breaks in later 0.9.x.

Changed

• orjson.dumps() when given a non-C contiguous numpy.ndarray has an error message suggesting to use default.

3.4.8 - 2021-02-04

Fixed

• aarch64 manylinux2014 wheels are now compatible with glibc 2.17.

Changed

• Fix build warnings on ppcle64.

3.4.7 - 2021-01-19

Changed

• Use vectorcall APIs for method calls on python3.9 and above.
• Publish python3.10 wheels for Linux on amd64 and aarch64.

3.4.6 - 2020-12-07

Fixed

• Fix compatibility with debug builds of CPython.

3.4.5 - 2020-12-02

Fixed

• Fix deserializing long strings on processors without AVX2.

3.4.4 - 2020-11-25

Changed

• orjson.dumps() serializes integers up to a 64-bit unsigned integer's maximum. It was previously the maximum of a 64-bit signed integer.

3.4.3 - 2020-10-30

Fixed

• Fix regression in parsing similar dict keys.

3.4.2 - 2020-10-29

Changed

• Improve deserialization performance.
• Publish Windows python3.9 wheel.
• Disable unsupported SIMD features on non-x86, non-ARM targets

3.4.1 - 2020-10-20

Fixed

• Fix orjson.dumps.__module__ and orjson.loads.__module__ not being the str "orjson".

Changed

• Publish macos python3.9 wheel.
• More packaging documentation.

3.4.0 - 2020-09-25

Added

• Serialize numpy.uint8 and numpy.int8 instances.

Fixed

• Fix serializing numpy.empty() instances.

Changed

• No longer publish manylinux1 wheels due to tooling dropping support.

3.3.1 - 2020-08-17

Fixed

• Fix failure to deserialize some latin1 strings on some platforms. This was introduced in 3.2.0.
• Fix annotation of optional parameters on orjson.dumps() for help().

Changed

• Publish manylinux2014 wheels for amd64 in addition to manylinux1.

3.3.0 - 2020-07-24

Added

• orjson.dumps() now serializes individual numpy floats and integers, e.g., numpy.float64(1.0).
• orjson.OPT_PASSTHROUGH_DATACLASS causes orjson.dumps() to pass dataclasses.dataclass instances to default.

3.2.2 - 2020-07-13

Fixed

• Fix serializing dataclasses.dataclass that have no attributes.

Changed

• Improve deserialization performance of str.

3.2.1 - 2020-07-03

Fixed

• Fix orjson.dumps(..., **{}) raising TypeError on python3.6.

3.2.0 - 2020-06-30

Added

• orjson.OPT_APPEND_NEWLINE appends a newline to output.

Changed

• Improve deserialization performance of str.

3.1.2 - 2020-06-23

Fixed

• Fix serializing zero-dimension numpy.ndarray.

3.1.1 - 2020-06-20

Fixed

• Fix repeated serialization of str that are ASCII-only and have a legacy (non-compact) layout.

3.1.0 - 2020-06-08

Added

• orjson.OPT_PASSTHROUGH_SUBCLASS causes orjson.dumps() to pass subclasses of builtin types to default so the caller can customize the output.
• orjson.OPT_PASSTHROUGH_DATETIME causes orjson.dumps() to pass datetime objects to default so the caller can customize the output.

3.0.2 - 2020-05-27

Changed

• orjson.dumps() does not serialize dataclasses.dataclass attributes that begin with a leading underscore, e.g., _attr. This is because of the Python idiom that a leading underscores marks an attribute as "private."
• orjson.dumps() does not serialize dataclasses.dataclass attributes that are InitVar or ClassVar whether using __slots__ or not.

3.0.1 - 2020-05-19

Fixed

• orjson.dumps() raises an exception if the object to be serialized is not given as a positional argument. orjson.dumps({}) is intended and ok while orjson.dumps(obj={}) is an error. This makes it consistent with the documentation, help() annotation, and type annotation.
• Fix orphan reference in exception creation that leaks memory until the garbage collector runs.

Changed

• Improve serialization performance marginally by using the fastcall/vectorcall calling convention on python3.7 and above.
• Reduce build time.

3.0.0 - 2020-05-01

Added

• orjson.dumps() serializes subclasses of str, int, list, and dict.

Changed

• orjson.dumps() serializes dataclasses.dataclass and uuid.UUID instances by default. The options OPT_SERIALIZE_DATACLASS and OPT_SERIALIZE_UUID can still be specified but have no effect.

2.6.8 - 2020-04-30

Changed

• The source distribution vendors a forked dependency.

2.6.7 - 2020-04-30

Fixed

• Fix integer overflows in debug builds.

Changed

• The source distribution sets the recommended RUSTFLAGS in .cargo/config.

2.6.6 - 2020-04-24

Fixed

• Import numpy only on first use of OPT_SERIALIZE_NUMPY to reduce interpreter start time when not used.
• Reduce build time by half.

2.6.5 - 2020-04-08

Fixed

• Fix deserialization raising JSONDecodeError on some valid negative floats with large exponents.

2.6.4 - 2020-04-08

Changed

• Improve deserialization performance of floats by about 40%.

2.6.3 - 2020-04-01

Changed

• Serialize enum.Enum objects.
• Minor performance improvements.

2.6.2 - 2020-03-27

Changed

• Publish python3.9 manylinux2014 wheel instead of manylinux1 for x86_64.
• Publish python3.9 manylinux2014 wheel for aarch64.

Fixed

• Fix compilation failure on 32-bit.

2.6.1 - 2020-03-19

Changed

• Serialization is 10-20% faster and uses about 50% less memory by writing directly to the returned bytes object.

2.6.0 - 2020-03-10

Added

• orjson.dumps() pretty prints with an indentation of two spaces if option=orjson.OPT_INDENT_2 is specified.

2.5.2 - 2020-03-07

Changed

• Publish manylinux2014 wheels for aarch64.
• numpy support now includes numpy.uint32 and numpy.uint64.

2.5.1 - 2020-02-24

Changed

• manylinux1 wheels for 3.6, 3.7, and 3.8 are now compliant with the spec by not depending on glibc 2.18.

2.5.0 - 2020-02-19

Added

• orjson.dumps() serializes dict keys of type other than str if option=orjson.OPT_NON_STR_KEYS is specified.

2.4.0 - 2020-02-14

Added

• orjson.dumps() serializes numpy.ndarray instances if option=orjson.OPT_SERIALIZE_NUMPY is specified.

Fixed

• Fix dataclasses.dataclass attributes that are dict to be effected by orjson.OPT_SORT_KEYS.

2.3.0 - 2020-02-12

Added

• orjson.dumps() serializes dict instances sorted by keys, equivalent to sort_keys in other implementations, if option=orjson.OPT_SORT_KEYS is specified.

Changed

• dataclasses.dataclass instances without __slots__ now serialize faster.

Fixed

• Fix documentation on default, in particular documenting the need to raise an exception if the type cannot be handled.

2.2.2 - 2020-02-10

Changed

• Performance improvements to serializing a list containing elements of the same type.

2.2.1 - 2020-02-04

Fixed

• orjson.loads() rejects floats that do not have a digit following the decimal, e.g., -2., 2.e-3.

Changed

• Build Linux, macOS, and Windows wheels on more recent distributions.

2.2.0 - 2020-01-22

Added

• orjson.dumps() serializes uuid.UUID instances if option=orjson.OPT_SERIALIZE_UUID is specified.

Changed

• Minor performance improvements.
• Publish Python 3.9 wheel for Linux.

2.1.4 - 2020-01-08

Fixed

• Specify a text signature for orjson.loads().

Changed

• Improve documentation.

2.1.3 - 2019-11-12

Changed

• Publish Python 3.8 wheels for macOS and Windows.

2.1.2 - 2019-11-07

Changed

• The recursion limit of default on orjson.dumps() has been increased from 5 to 254.

2.1.1 - 2019-10-29

Changed

• Publish manylinux1 wheels instead of manylinux2010.

2.1.0 - 2019-10-24

Added

• orjson.dumps() serializes dataclasses.dataclass instances if option=orjson.OPT_SERIALIZE_DATACLASS is specified.
• orjson.dumps() accepts orjson.OPT_UTC_Z to serialize UTC as "Z" instead of "+00:00".
• orjson.dumps() accepts orjson.OPT_OMIT_MICROSECONDS to not serialize the microseconds attribute of datetime.datetime and datetime.time instances.
• orjson.loads() accepts bytearray.

Changed

• Drop support for Python 3.5.
• Publish manylinux2010 wheels instead of manylinux1.

2.0.11 - 2019-10-01

Changed

• Publish Python 3.8 wheel for Linux.

2.0.10 - 2019-09-25

Changed

• Performance improvements and lower memory usage in deserialization by creating only one str object for repeated map keys.

2.0.9 - 2019-09-22

Changed

• Minor performance improvements.

Fixed

• Fix inaccurate zero padding in serialization of microseconds on datetime.time objects.

2.0.8 - 2019-09-18

Fixed

• Fix inaccurate zero padding in serialization of microseconds on datetime.datetime objects.

2.0.7 - 2019-08-29

Changed

• Publish PEP 517 source distribution.

Fixed

• orjson.dumps() raises JSONEncodeError on circular references.

2.0.6 - 2019-05-11

Changed

• Performance improvements.

2.0.5 - 2019-04-19

Fixed

• Fix inaccuracy in deserializing some float values, e.g., 31.245270191439438 was parsed to 31.24527019143944. Serialization was unaffected.

2.0.4 - 2019-04-02

Changed

• orjson.dumps() now serializes datetime.datetime objects without a tzinfo rather than raising JSONEncodeError.

2.0.3 - 2019-03-23

Changed

• orjson.loads() uses SSE2 to validate bytes input.

2.0.2 - 2019-03-12

Changed

• Support Python 3.5.

2.0.1 - 2019-02-05

Changed

• Publish Windows wheel.

2.0.0 - 2019-01-28

Added

• orjson.dumps() accepts a default callable to serialize arbitrary types.
• orjson.dumps() accepts datetime.datetime, datetime.date, and datetime.time. Each is serialized to an RFC 3339 string.
• orjson.dumps(..., option=orjson.OPT_NAIVE_UTC) allows serializing datetime.datetime objects that do not have a timezone set as UTC.
• orjson.dumps(..., option=orjson.OPT_STRICT_INTEGER) available to raise an error on integer values outside the 53-bit range of all JSON implementations.

Changed

• orjson.dumps() no longer accepts bytes.

1.3.1 - 2019-01-03

Fixed

• Handle invalid UTF-8 in str.

1.3.0 - 2019-01-02

Changed

• Performance improvements of 15-25% on serialization, 10% on deserialization.

1.2.1 - 2018-12-31

Fixed

• Fix memory leak in deserializing dict.

1.2.0 - 2018-12-16

Changed

• Performance improvements.

1.1.0 - 2018-12-04

Changed

• Performance improvements.

Fixed

• Dict key can only be str.

1.0.1 - 2018-11-26

Fixed

• pyo3 bugfix update.

1.0.0 - 2018-11-23

Added

• orjson.dumps() function.
• orjson.loads() function.