diff --git a/libs/core/pyproject.toml b/libs/core/pyproject.toml
index b185380b7e016..89e46905f9b56 100644
--- a/libs/core/pyproject.toml
+++ b/libs/core/pyproject.toml
@@ -1,10 +1,10 @@
 [build-system]
-requires = ["poetry-core>=1.0.0"]
+requires = [ "poetry-core>=1.0.0",]
 build-backend = "poetry.core.masonry.api"
 
 [tool.poetry]
 name = "langchain-core"
-version = "0.3.0"
+version = "0.3.1"
 description = "Building applications with LLMs through composability"
 authors = []
 license = "MIT"
@@ -12,17 +12,10 @@ readme = "README.md"
 repository = "https://github.com/langchain-ai/langchain"
 
 [tool.mypy]
-exclude = [
-    "notebooks",
-    "examples",
-    "example_data",
-    "langchain_core/pydantic",
-    "tests/unit_tests/utils/test_function_calling.py",
-]
-"disallow_untyped_defs" = "True"
-
+exclude = [ "notebooks", "examples", "example_data", "langchain_core/pydantic", "tests/unit_tests/utils/test_function_calling.py",]
+disallow_untyped_defs = "True"
 [[tool.mypy.overrides]]
-module = ["numpy", "pytest"]
+module = [ "numpy", "pytest",]
 ignore_missing_imports = true
 
 [tool.poetry.urls]
@@ -37,32 +30,28 @@ jsonpatch = "^1.33"
 PyYAML = ">=5.3"
 packaging = ">=23.2,<25"
 typing-extensions = ">=4.7"
-pydantic = [
-    { version = "^2.5.2", python = "<3.12.4" },
-    { version = "^2.7.4", python = ">=3.12.4" },
-]
+[[tool.poetry.dependencies.pydantic]]
+version = "^2.5.2"
+python = "<3.12.4"
 
+[[tool.poetry.dependencies.pydantic]]
+version = "^2.7.4"
+python = ">=3.12.4"
 
 [tool.poetry.extras]
 
 [tool.ruff.lint]
-select = ["B", "E", "F", "I", "T201", "UP"]
-ignore = ["UP006", "UP007"]
+select = [ "B", "E", "F", "I", "T201", "UP",]
+ignore = [ "UP006", "UP007",]
 
 [tool.coverage.run]
-omit = ["tests/*"]
+omit = [ "tests/*",]
 
 [tool.pytest.ini_options]
 addopts = "--snapshot-warn-unused --strict-markers --strict-config --durations=5"
-markers = [
-    "requires: mark tests as requiring a specific library",
-    "asyncio: mark tests as requiring asyncio",
-    "compile: mark placeholder test used to compile integration tests without running them",
-]
+markers = [ "requires: mark tests as requiring a specific library", "asyncio: mark tests as requiring asyncio", "compile: mark placeholder test used to compile integration tests without running them",]
 asyncio_mode = "auto"
-filterwarnings = [
-    "ignore::langchain_core._api.beta_decorator.LangChainBetaWarning",
-]
+filterwarnings = [ "ignore::langchain_core._api.beta_decorator.LangChainBetaWarning",]
 
 [tool.poetry.group.lint]
 optional = true
@@ -80,9 +69,9 @@ optional = true
 optional = true
 
 [tool.ruff.lint.per-file-ignores]
-"tests/unit_tests/prompts/test_chat.py" = ["E501"]
-"tests/unit_tests/runnables/test_runnable.py" = ["E501"]
-"tests/unit_tests/runnables/test_graph.py" = ["E501"]
+"tests/unit_tests/prompts/test_chat.py" = [ "E501",]
+"tests/unit_tests/runnables/test_runnable.py" = [ "E501",]
+"tests/unit_tests/runnables/test_graph.py" = [ "E501",]
 
 [tool.poetry.group.lint.dependencies]
 ruff = "^0.5"