diff --git a/libs/langchain/pyproject.toml b/libs/langchain/pyproject.toml
index 17197750fdd..877ac364822 100644
--- a/libs/langchain/pyproject.toml
+++ b/libs/langchain/pyproject.toml
@@ -1,6 +1,6 @@
 [build-system]
-requires = [ "poetry-core>=1.0.0",]
-build-backend = "poetry.core.masonry.api"
+requires = ["pdm-backend"]
+build-backend = "pdm.backend"
 
 [tool.poetry]
 name = "langchain"
@@ -189,3 +189,159 @@ develop = true
 [tool.poetry.group.dev.dependencies.langchain-text-splitters]
 path = "../text-splitters"
 develop = true
+
+[tool.pdm.dev-dependencies]
+test = [
+    "pytest<9,>=8",
+    "pytest-cov<5.0.0,>=4.0.0",
+    "pytest-dotenv<1.0.0,>=0.5.2",
+    "duckdb-engine<1.0.0,>=0.9.2",
+    "pytest-watcher<1.0.0,>=0.2.6",
+    "freezegun<2.0.0,>=1.2.2",
+    "responses<1.0.0,>=0.22.0",
+    "pytest-asyncio<1.0.0,>=0.23.2",
+    "lark<2.0.0,>=1.1.5",
+    "pandas<3.0.0,>=2.0.0",
+    "pytest-mock<4.0.0,>=3.10.0",
+    "pytest-socket<1.0.0,>=0.6.0",
+    "syrupy<5.0.0,>=4.0.2",
+    "requests-mock<2.0.0,>=1.11.0",
+    "pytest-xdist<4.0.0,>=3.6.1",
+    "cffi<1.17.1; python_version < \"3.10\"",
+    "cffi; python_version >= \"3.10\"",
+    "langchain-tests @ file:///${PROJECT_ROOT}/../standard-tests",
+    "langchain-core @ file:///${PROJECT_ROOT}/../core",
+    "langchain-text-splitters @ file:///${PROJECT_ROOT}/../text-splitters",
+    "langchain-openai @ file:///${PROJECT_ROOT}/../partners/openai",
+]
+codespell = [
+    "codespell<3.0.0,>=2.2.0",
+]
+test_integration = [
+    "pytest-vcr<2.0.0,>=1.0.2",
+    "wrapt<2.0.0,>=1.15.0",
+    "python-dotenv<2.0.0,>=1.0.0",
+    "cassio<1.0.0,>=0.1.0",
+    "langchainhub<1.0.0,>=0.1.16",
+    "langchain-core @ file:///${PROJECT_ROOT}/../core",
+    "langchain-text-splitters @ file:///${PROJECT_ROOT}/../text-splitters",
+]
+lint = [
+    "ruff<1.0.0,>=0.9.2",
+    "cffi<1.17.1; python_version < \"3.10\"",
+    "cffi; python_version >= \"3.10\"",
+]
+typing = [
+    "mypy<2.0,>=1.10",
+    "types-pyyaml<7.0.0.0,>=6.0.12.2",
+    "types-requests<3.0.0.0,>=2.28.11.5",
+    "types-toml<1.0.0.0,>=0.10.8.1",
+    "types-redis<5.0.0.0,>=4.3.21.6",
+    "types-pytz<2024.0.0.0,>=2023.3.0.0",
+    "types-chardet<6.0.0.0,>=5.0.4.6",
+    "mypy-protobuf<4.0.0,>=3.0.0",
+    "langchain-core @ file:///${PROJECT_ROOT}/../core",
+    "langchain-text-splitters @ file:///${PROJECT_ROOT}/../text-splitters",
+]
+dev = [
+    "jupyter<2.0.0,>=1.0.0",
+    "playwright<2.0.0,>=1.28.0",
+    "setuptools<68.0.0,>=67.6.1",
+    "langchain-core @ file:///${PROJECT_ROOT}/../core",
+    "langchain-text-splitters @ file:///${PROJECT_ROOT}/../text-splitters",
+]
+
+[tool.pdm.build]
+includes = []
+
+[project]
+authors = []
+license = {text = "MIT"}
+requires-python = "<4.0,>=3.9"
+dependencies = [
+    "langchain-core<1.0.0,>=0.3.33",
+    "langchain-text-splitters<1.0.0,>=0.3.3",
+    "langsmith<0.4,>=0.1.17",
+    "pydantic<3.0.0,>=2.7.4",
+    "SQLAlchemy<3,>=1.4",
+    "requests<3,>=2",
+    "PyYAML>=5.3",
+    "aiohttp<4.0.0,>=3.8.3",
+    "tenacity!=8.4.0,<10,>=8.1.0",
+    "numpy<2,>=1.22.4; python_version < \"3.12\"",
+    "numpy<3,>=1.26.2; python_version >= \"3.12\"",
+    "async-timeout<5.0.0,>=4.0.0; python_version < \"3.11\"",
+]
+name = "langchain"
+version = "0.3.17"
+description = "Building applications with LLMs through composability"
+readme = "README.md"
+
+[project.urls]
+"Source Code" = "https://github.com/langchain-ai/langchain/tree/master/libs/langchain"
+"Release Notes" = "https://github.com/langchain-ai/langchain/releases?q=tag%3A%22langchain%3D%3D0%22&expanded=true"
+repository = "https://github.com/langchain-ai/langchain"
+
+[project.scripts]
+langchain-server = "langchain.server:main"
+
+[dependency-groups]
+test = [
+    "pytest<9,>=8",
+    "pytest-cov<5.0.0,>=4.0.0",
+    "pytest-dotenv<1.0.0,>=0.5.2",
+    "duckdb-engine<1.0.0,>=0.9.2",
+    "pytest-watcher<1.0.0,>=0.2.6",
+    "freezegun<2.0.0,>=1.2.2",
+    "responses<1.0.0,>=0.22.0",
+    "pytest-asyncio<1.0.0,>=0.23.2",
+    "lark<2.0.0,>=1.1.5",
+    "pandas<3.0.0,>=2.0.0",
+    "pytest-mock<4.0.0,>=3.10.0",
+    "pytest-socket<1.0.0,>=0.6.0",
+    "syrupy<5.0.0,>=4.0.2",
+    "requests-mock<2.0.0,>=1.11.0",
+    "pytest-xdist<4.0.0,>=3.6.1",
+    "cffi<1.17.1; python_version < \"3.10\"",
+    "cffi; python_version >= \"3.10\"",
+    "langchain-tests @ file:///${PROJECT_ROOT}/../standard-tests",
+    "langchain-core @ file:///${PROJECT_ROOT}/../core",
+    "langchain-text-splitters @ file:///${PROJECT_ROOT}/../text-splitters",
+    "langchain-openai @ file:///${PROJECT_ROOT}/../partners/openai",
+]
+codespell = [
+    "codespell<3.0.0,>=2.2.0",
+]
+test_integration = [
+    "pytest-vcr<2.0.0,>=1.0.2",
+    "wrapt<2.0.0,>=1.15.0",
+    "python-dotenv<2.0.0,>=1.0.0",
+    "cassio<1.0.0,>=0.1.0",
+    "langchainhub<1.0.0,>=0.1.16",
+    "langchain-core @ file:///${PROJECT_ROOT}/../core",
+    "langchain-text-splitters @ file:///${PROJECT_ROOT}/../text-splitters",
+]
+lint = [
+    "ruff<1.0.0,>=0.9.2",
+    "cffi<1.17.1; python_version < \"3.10\"",
+    "cffi; python_version >= \"3.10\"",
+]
+typing = [
+    "mypy<2.0,>=1.10",
+    "types-pyyaml<7.0.0.0,>=6.0.12.2",
+    "types-requests<3.0.0.0,>=2.28.11.5",
+    "types-toml<1.0.0.0,>=0.10.8.1",
+    "types-redis<5.0.0.0,>=4.3.21.6",
+    "types-pytz<2024.0.0.0,>=2023.3.0.0",
+    "types-chardet<6.0.0.0,>=5.0.4.6",
+    "mypy-protobuf<4.0.0,>=3.0.0",
+    "langchain-core @ file:///${PROJECT_ROOT}/../core",
+    "langchain-text-splitters @ file:///${PROJECT_ROOT}/../text-splitters",
+]
+dev = [
+    "jupyter<2.0.0,>=1.0.0",
+    "playwright<2.0.0,>=1.28.0",
+    "setuptools<68.0.0,>=67.6.1",
+    "langchain-core @ file:///${PROJECT_ROOT}/../core",
+    "langchain-text-splitters @ file:///${PROJECT_ROOT}/../text-splitters",
+]