diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 43d7aeb..e52c4f3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
 
     steps:
       - uses: actions/checkout@v4
@@ -39,7 +39,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
 
     steps:
       - uses: actions/checkout@v4
@@ -59,7 +59,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
 
     steps:
       - uses: actions/checkout@v4
@@ -81,7 +81,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
 
     steps:
       - uses: actions/checkout@v4
@@ -101,7 +101,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
 
     steps:
       - uses: actions/checkout@v4
@@ -123,7 +123,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
 
     steps:
       - uses: actions/checkout@v4
@@ -143,7 +143,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
 
     steps:
       - uses: actions/checkout@v4
@@ -165,7 +165,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
 
     steps:
       - uses: actions/checkout@v4
diff --git a/packages/ai-providers/server-ai-langchain/pyproject.toml b/packages/ai-providers/server-ai-langchain/pyproject.toml
index 0f51402..a8fe2ef 100644
--- a/packages/ai-providers/server-ai-langchain/pyproject.toml
+++ b/packages/ai-providers/server-ai-langchain/pyproject.toml
@@ -5,13 +5,12 @@ description = "LaunchDarkly AI SDK LangChain Provider"
 authors = [{name = "LaunchDarkly", email = "dev@launchdarkly.com"}]
 license = {text = "Apache-2.0"}
 readme = "README.md"
-requires-python = ">=3.9,<4"
+requires-python = ">=3.10,<4"
 classifiers = [
     "Intended Audience :: Developers",
     "License :: OSI Approved :: Apache Software License",
     "Operating System :: OS Independent",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
@@ -21,8 +20,8 @@ classifiers = [
 ]
 dependencies = [
     "launchdarkly-server-sdk-ai>=0.16.0",
-    "langchain-core>=0.2.0",
-    "langchain>=0.2.0",
+    "langchain-core>=1.0.0",
+    "langchain>=1.0.0",
 ]
 
 [project.urls]
@@ -47,7 +46,7 @@ build-backend = "hatchling.build"
 packages = ["src/ldai_langchain"]
 
 [tool.mypy]
-python_version = "3.9"
+python_version = "3.10"
 ignore_missing_imports = true
 install_types = true
 non_interactive = true
diff --git a/packages/ai-providers/server-ai-openai/pyproject.toml b/packages/ai-providers/server-ai-openai/pyproject.toml
index 9644628..eec8642 100644
--- a/packages/ai-providers/server-ai-openai/pyproject.toml
+++ b/packages/ai-providers/server-ai-openai/pyproject.toml
@@ -5,13 +5,12 @@ description = "LaunchDarkly AI SDK OpenAI Provider"
 authors = [{name = "LaunchDarkly", email = "dev@launchdarkly.com"}]
 license = {text = "Apache-2.0"}
 readme = "README.md"
-requires-python = ">=3.9,<4"
+requires-python = ">=3.10,<4"
 classifiers = [
     "Intended Audience :: Developers",
     "License :: OSI Approved :: Apache Software License",
     "Operating System :: OS Independent",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
@@ -46,7 +45,7 @@ build-backend = "hatchling.build"
 packages = ["src/ldai_openai"]
 
 [tool.mypy]
-python_version = "3.9"
+python_version = "3.10"
 ignore_missing_imports = true
 install_types = true
 non_interactive = true
diff --git a/packages/optimization/pyproject.toml b/packages/optimization/pyproject.toml
index 3584bf4..375e45e 100644
--- a/packages/optimization/pyproject.toml
+++ b/packages/optimization/pyproject.toml
@@ -5,13 +5,12 @@ description = "LaunchDarkly AI SDK optimization helpers"
 authors = [{name = "LaunchDarkly", email = "dev@launchdarkly.com"}]
 license = {text = "Apache-2.0"}
 readme = "README.md"
-requires-python = ">=3.9,<4"
+requires-python = ">=3.10,<4"
 classifiers = [
     "Intended Audience :: Developers",
     "License :: OSI Approved :: Apache Software License",
     "Operating System :: OS Independent",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
@@ -45,7 +44,7 @@ build-backend = "hatchling.build"
 packages = ["src/ldai_optimization"]
 
 [tool.mypy]
-python_version = "3.9"
+python_version = "3.10"
 ignore_missing_imports = true
 install_types = true
 non_interactive = true
diff --git a/packages/sdk/server-ai/pyproject.toml b/packages/sdk/server-ai/pyproject.toml
index 15e2fca..35d8987 100644
--- a/packages/sdk/server-ai/pyproject.toml
+++ b/packages/sdk/server-ai/pyproject.toml
@@ -5,13 +5,12 @@ description = "LaunchDarkly SDK for AI"
 authors = [{name = "LaunchDarkly", email = "dev@launchdarkly.com"}]
 license = {text = "Apache-2.0"}
 readme = "README.md"
-requires-python = ">=3.9,<4"
+requires-python = ">=3.10,<4"
 classifiers = [
     "Intended Audience :: Developers",
     "License :: OSI Approved :: Apache Software License",
     "Operating System :: OS Independent",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
@@ -59,7 +58,7 @@ build-backend = "hatchling.build"
 packages = ["src/ldai"]
 
 [tool.mypy]
-python_version = "3.9"
+python_version = "3.10"
 ignore_missing_imports = true
 install_types = true
 non_interactive = true