--- title: "langchain-core Breaking Changes on PyPI | Since.dev" description: "What each langchain-core release removed, renamed or changed: 1,149 breaking changes in 18 versions on PyPI, each with its source." canonical_url: https://since.dev/packages/pypi/langchain-core last_updated: 2026-05-05 --- # langchain-core breaking changes Every breaking API change we have recorded in langchain-core on PyPI: 1,149 breaking changes in 18 versions. Below are its newest 6 versions, removals and renames first, each with its source. Newest change May 5, 2026 ## 1.3.3 5 breaking changes, first published May 5, 2026. - **Signature changed** `langchain_core.load.load.load` Was def load(obj: Any, \*, allowed_objects: Iterable\[AllowedObject\] | Literal\['all', 'core'\] = 'core', secrets_map: dict\[str, str\] | None = None, valid_namespaces: list\[str\] | None = None, secrets_from_env: bool = False... [pypi.org](https://pypi.org/project/langchain-core/1.3.3/) - **Signature changed** `langchain_core.load.load.Reviver.__init__` Was def \_\_init\_\_(self, allowed_objects: Iterable\[AllowedObject\] | Literal\['all', 'core'\] = 'core', secrets_map: dict\[str, str\] | None = None, valid_namespaces: list\[str\] | None = None, secrets_from_env: bool = False... [pypi.org](https://pypi.org/project/langchain-core/1.3.3/) - **Signature changed** `langchain_core.load.loads` Was def loads(text: str, \*, allowed_objects: Iterable\[AllowedObject\] | Literal\['all', 'core'\] = 'core', secrets_map: dict\[str, str\] | None = None, valid_namespaces: list\[str\] | None = None, secrets_from_env: bool = False... [pypi.org](https://pypi.org/project/langchain-core/1.3.3/) - **Signature changed** `langchain_core.runnables.history.load` Was def load(obj: Any, \*, allowed_objects: Iterable\[AllowedObject\] | Literal\['all', 'core'\] = 'core', secrets_map: dict\[str, str\] | None = None, valid_namespaces: list\[str\] | None = None, secrets_from_env: bool = False... [pypi.org](https://pypi.org/project/langchain-core/1.3.3/) - **Signature changed** `langchain_core.tracers.log_stream.load` Was def load(obj: Any, \*, allowed_objects: Iterable\[AllowedObject\] | Literal\['all', 'core'\] = 'core', secrets_map: dict\[str, str\] | None = None, valid_namespaces: list\[str\] | None = None, secrets_from_env: bool = False... [pypi.org](https://pypi.org/project/langchain-core/1.3.3/) ## 1.3.0 5 breaking changes, first published April 17, 2026. - **Signature changed** `langchain_core.callbacks.CallbackManager.configure` Was @classmethod def configure(cls, inheritable_callbacks: Callbacks = None, local_callbacks: Callbacks = None, verbose: bool = False, inheritable_tags: list\[str\] | None = None, local_tags: list\[str\] | None = None, inheritable_metadata... [pypi.org](https://pypi.org/project/langchain-core/1.3.0/) - **Signature changed** `langchain_core.tracers.BaseTracer.__init__` Was def \_\_init\_\_(self, \*, \_schema_format: Literal\['original', 'streaming_events', 'original+chat'\] = 'original', \*\*kwargs: Any) -> None; now def \_\_init\_\_(self, \*, \_schema_format: Literal\['original', 'streaming_events', 'original+chat'\] =... [pypi.org](https://pypi.org/project/langchain-core/1.3.0/) - **Signature changed** `langchain_core.tracers.BaseTracer.order_map` Was order_map: dict\[UUID, tuple\[UUID, str\]\]; now order_map. [pypi.org](https://pypi.org/project/langchain-core/1.3.0/) - **Signature changed** `langchain_core.tracers.BaseTracer.run_map` Was run_map: dict\[str, Run\]; now run_map. [pypi.org](https://pypi.org/project/langchain-core/1.3.0/) - **Signature changed** `langchain_core.tracers.LangChainTracer.__init__` Was def \_\_init\_\_(self, example_id: UUID | str | None = None, project_name: str | None = None, client: Client | None = None, tags: list\[str\] | None = None, \*\*kwargs: Any) -> None; now def \_\_init\_\_(self, example_id: UUID | str | None = None... [pypi.org](https://pypi.org/project/langchain-core/1.3.0/) ## 1.2.22 3 breaking changes, first published March 24, 2026. - **Signature changed** `langchain_core.prompts.load_prompt` Was def load_prompt(path: str | Path, encoding: str | None = None) -> BasePromptTemplate; now def load_prompt(path: str | Path, encoding: str | None = None, \*, allow_dangerous_paths: bool = False) -> BasePromptTemplate. [pypi.org](https://pypi.org/project/langchain-core/1.2.22/) - **Signature changed** `langchain_core.prompts.loading.load_prompt_from_config` Was def load_prompt_from_config(config: dict) -> BasePromptTemplate; now def load_prompt_from_config(config: dict, \*, allow_dangerous_paths: bool = False) -> BasePromptTemplate. [pypi.org](https://pypi.org/project/langchain-core/1.2.22/) - **Signature changed** `langchain_core.prompts.loading.type_to_loader_dict` Was type_to_loader_dict: dict\[str, Callable\[\[dict\], BasePromptTemplate\]\]; now type_to_loader_dict: dict\[str, Callable\[..., BasePromptTemplate\]\]. [pypi.org](https://pypi.org/project/langchain-core/1.2.22/) ## 1.2.15 4 breaking changes, first published February 23, 2026. - **Removed** `langchain_core.callbacks.manager.ConsoleCallbackHandler` langchain_core.callbacks.manager.ConsoleCallbackHandler was removed in langchain-core 1.2.15 [pypi.org](https://pypi.org/project/langchain-core/1.2.15/) - **Removed** `langchain_core.callbacks.manager.LangChainTracer` langchain_core.callbacks.manager.LangChainTracer was removed in langchain-core 1.2.15 [pypi.org](https://pypi.org/project/langchain-core/1.2.15/) - **Removed** `langchain_core.callbacks.manager.tracing_v2_callback_var` langchain_core.callbacks.manager.tracing_v2_callback_var was removed in langchain-core 1.2.15 [pypi.org](https://pypi.org/project/langchain-core/1.2.15/) - **Removed** `langchain_core.runnables.config.LangChainTracer` langchain_core.runnables.config.LangChainTracer was removed in langchain-core 1.2.15 [pypi.org](https://pypi.org/project/langchain-core/1.2.15/) ## 1.2.10 1 breaking change, first published February 10, 2026. - **Signature changed** `langchain_core.messages.utils.count_tokens_approximately` Was def count_tokens_approximately(messages: Iterable\[MessageLikeRepresentation\], \*, chars_per_token: float = 4.0, extra_tokens_per_message: float = 3.0, count_name: bool = True, tokens_per_image: int = 85, use_usage_metadata_scaling: bool... [pypi.org](https://pypi.org/project/langchain-core/1.2.10/) ## 1.2.9 1 breaking change, first published February 5, 2026. - **Signature changed** `langchain_core.messages.utils.count_tokens_approximately` Was def count_tokens_approximately(messages: Iterable\[MessageLikeRepresentation\], \*, chars_per_token: float = 4.0, extra_tokens_per_message: float = 3.0, count_name: bool = True, tokens_per_image: int = 85) -> int; now def... [pypi.org](https://pypi.org/project/langchain-core/1.2.9/) ## Check your code These are the changes. To see which of them reach your code, [scan a public repository](https://since.dev/scan.md), or have your coding agent call `check_code` with your manifest or lockfile over [MCP](https://since.dev/docs.md#mcp). [The API](https://since.dev/docs.md#api) reads every change in every version, not only the newest. On Team and up, a fix pull request opens for the changes that reach a connected repository. 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