feat!: Raise minimum Python version to 3_10

Co-authored-by: George Weale <gweale@google.com>
PiperOrigin-RevId: 833363352

Author: GWeale

AGENTS.md

@@ -119,7 +119,8 @@ app = App(
 ### Requirements
 
 **Minimum requirements:**
-- Python 3.9+ (**Python 3.11+ strongly recommended** for best performance)
+
+- Python 3.10+ (**Python 3.11+ strongly recommended** for best performance)
 - `uv` package manager (**required** - faster than pip/venv)
 
 **Install uv if not already installed:**
@@ -326,11 +327,6 @@ pytest tests/unittests -n auto
 # Run a specific test file during development
 pytest tests/unittests/agents/test_llm_agent.py
 
-# Python 3.9 compatibility mode (excludes features requiring 3.10+)
-pytest tests/unittests \
-  --ignore=tests/unittests/a2a \
-  --ignore=tests/unittests/tools/mcp_tool \
-  --ignore=tests/unittests/artifacts/test_artifact_service.py
 ```
 
 ### Testing Philosophy

CONTRIBUTING.md

@@ -145,7 +145,7 @@ part before or alongside your code PR.
 
 3.  **Create and activate a virtual environment:**
 
-    **NOTE**: ADK supports Python 3.9+. Python 3.11 and above is strongly
+    **NOTE**: ADK supports Python 3.10+. Python 3.11 and above is strongly
     recommended.
 
     Create a workspace venv using uv.

pyproject.toml

@@ -5,7 +5,7 @@
 name = "google-adk"
 description = "Agent Development Kit"
 readme = "README.md"
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 license = { file = "LICENSE" }
 authors = [{ name = "Google LLC", email = "googleapis-packages@google.com" }]
 classifiers = [ # List of https://pypi.org/classifiers/
@@ -27,7 +27,7 @@ dependencies = [
   # go/keep-sorted start
   "PyYAML>=6.0.2, <7.0.0",                                   # For APIHubToolset.
   "aiosqlite>=0.21.0",                                       # For SQLite database
-  "anyio>=4.9.0, <5.0.0;python_version>='3.10'",             # For MCP Session Manager
+  "anyio>=4.9.0, <5.0.0",                                    # For MCP Session Manager
   "authlib>=1.5.1, <2.0.0",                                  # For RestAPI Tool
   "click>=8.1.8, <9.0.0",                                    # For CLI tools
   "fastapi>=0.115.0, <0.119.0",                              # FastAPI framework
@@ -44,7 +44,7 @@ dependencies = [
   "google-genai>=1.45.0, <2.0.0",                            # Google GenAI SDK
   "graphviz>=0.20.2, <1.0.0",                                # Graphviz for graph rendering
   "jsonschema>=4.23.0, <5.0.0",                              # Agent Builder config validation
-  "mcp>=1.8.0, <2.0.0;python_version>='3.10'",               # For MCP Toolset
+  "mcp>=1.8.0, <2.0.0",                                      # For MCP Toolset
   "opentelemetry-api>=1.37.0, <=1.37.0",                     # OpenTelemetry - limit upper version for sdk and api to not risk breaking changes from unstable _logs package.
   "opentelemetry-exporter-gcp-logging>=1.9.0a0, <2.0.0",
   "opentelemetry-exporter-gcp-monitoring>=1.9.0a0, <2.0.0",
@@ -93,7 +93,7 @@ dev = [
 
 a2a = [
   # go/keep-sorted start
-  "a2a-sdk>=0.3.11,<0.4.0;python_version>='3.10'",
+  "a2a-sdk>=0.3.4,<0.4.0",
   # go/keep-sorted end
 ]
 
@@ -114,9 +114,9 @@ eval = [
 
 test = [
   # go/keep-sorted start
-  "a2a-sdk>=0.3.0,<0.4.0;python_version>='3.10'",
+  "a2a-sdk>=0.3.0,<0.4.0",
   "anthropic>=0.43.0",                            # For anthropic model tests
-  "crewai[tools];python_version>='3.10' and python_version<'3.14'",         # For CrewaiTool tests
+  "crewai[tools];python_version>='3.10' and python_version<'3.12'",         # For CrewaiTool tests; chromadb/pypika fail on 3.12+
   "kubernetes>=29.0.0",                           # For GkeCodeExecutor
   "langchain-community>=0.3.17",
   "langgraph>=0.2.60, <0.4.8",                    # For LangGraphAgent
@@ -126,7 +126,7 @@ test = [
   "pytest-asyncio>=0.25.0",
   "pytest-mock>=3.14.0",
   "pytest-xdist>=3.6.1",
-  "pytest>=8.3.4",
+  "pytest>=9.0.0,<10.0.0",
   "python-multipart>=0.0.9",
   "rouge-score>=0.1.2",
   "tabulate>=0.9.0",
@@ -146,7 +146,7 @@ docs = [
 extensions = [
   "anthropic>=0.43.0",                          # For anthropic model support
   "beautifulsoup4>=3.2.2",                      # For load_web_page tool.
-  "crewai[tools];python_version>='3.10' and python_version<'3.14'",       # For CrewaiTool
+  "crewai[tools];python_version>='3.10' and python_version<'3.12'",       # For CrewaiTool; chromadb/pypika fail on 3.12+
   "docker>=7.0.0",                              # For ContainerCodeExecutor
   "kubernetes>=29.0.0",                         # For GkeCodeExecutor
   "langgraph>=0.2.60, <0.4.8",                  # For LangGraphAgent
@@ -208,7 +208,7 @@ asyncio_mode = "auto"
 
 
 [tool.mypy]
-python_version = "3.9"
+python_version = "3.10"
 exclude = "tests/"
 plugins = ["pydantic.mypy"]
 # Start with non-strict mode, and swtich to strict mode later.