feat: remove python 3.9

.github/actions/upload-bundle-artifacts/action.yml

@@ -43,8 +43,8 @@ runs:
         aws s3 cp "dist/python${PYTHON_VERSION}.tar" "${BASE_PATH}/" --acl public-read --no-progress
         aws s3 cp "dist/constraints${PYTHON_VERSION}.txt" "${BASE_PATH}/" --acl public-read --no-progress
 
-        # Upload shared files only from Python 3.9
-        if [ "${PYTHON_VERSION}" = "3.9" ]; then
+        # Upload shared files only from Python 3.10
+        if [ "${PYTHON_VERSION}" = "3.10" ]; then
           [ -f dist/installer.zip ] && aws s3 cp dist/installer.zip "${BASE_PATH}/" --acl public-read --no-progress
           aws s3 sync dist/ "${BASE_PATH}/" --exclude "*" --include "*.whl" --acl public-read
         fi

.github/workflows/cd.yml

@@ -35,7 +35,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python_version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python_version: ["3.10", "3.11", "3.12", "3.13"]
     permissions:
       id-token: write
       contents: read
@@ -415,7 +415,7 @@ jobs:
     needs: build-and-push-artifacts-status
     if: github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/tags/')
     env:
-      PYTHON_VERSIONS: "3.9,3.10,3.11,3.12,3.13"
+      PYTHON_VERSIONS: "3.10,3.11,3.12,3.13"
     steps:
       - name: Checkout code
         uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4

.github/workflows/ci.yml

@@ -158,7 +158,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
 
     steps:
     - name: Checkout code
@@ -277,7 +277,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
     steps:
       - name: Checkout code
         uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
@@ -396,13 +396,13 @@ jobs:
         run: |
           shopt -s nullglob
           mkdir -p coverage-data
-          
+
           i=0
           for file in coverage-artifacts/*/.coverage; do
             cp "$file" "coverage-data/.coverage.$i"
             i=$((i + 1))
           done
-          
+
           coverage combine coverage-data/
           coverage xml -o coverage-data/coverage.xml
           coverage report

CLAUDE.md

@@ -9,7 +9,7 @@
 - Setup pre-commit hooks: `poetry poe setup-hooks`
 - Run unit tests (all): `nox -e unit`
 - Run integration tests: `nox -e integration`
-- Run specific test: `nox --force-color -e unit -p 3.9 -- tests/unit/test_file.py::TestClass::test_name`
+- Run specific test: `nox --force-color -e unit -p 3.10 -- tests/unit/test_file.py::TestClass::test_name`
 - Run local tests: `./bin/test-local`
 
 ## Code Coverage Commands
@@ -52,7 +52,7 @@
 
 ## Python Version Support
 
-- Python 3.9, 3.10, 3.11, 3.12, 3.13
+- Python 3.10, 3.11, 3.12, 3.13
 
 ## Dependencies
 
@@ -66,7 +66,7 @@
 - Early returns to reduce nesting: Check conditions and return early
 - Extract common checks into variables for readability
 - Use dictionary unpacking for headers: `headers = {"Content-Type": "application/json", **auth_headers}`
-- CLI arguments: Use space-separated format (`--port 8080`) 
+- CLI arguments: Use space-separated format (`--port 8080`)
 
 ## Testing
 

CONTRIBUTING.md

@@ -223,7 +223,7 @@ Each PR creates a review application for testing. Access it via GitHub checks. M
 
 We use Docker to ensure reproducible environments due to Jupyter libraries' binary dependencies:
 
-- `builder.Dockerfile`: Creates Python package bundles for different versions (3.9-3.12), generates kernel and server bundles, and packages the toolkit for distribution using Poetry.
+- `builder.Dockerfile`: Creates Python package bundles for different versions (3.10-3.13), generates kernel and server bundles, and packages the toolkit for distribution using Poetry.
 
 - `test.Dockerfile`: Provides consistent test environment for running unit and integration tests across Python versions using nox. Used both locally and in CI/CD pipeline.
 

noxfile.py

@@ -3,7 +3,7 @@
 from nox import session
 
 
-@session(python=["3.9", "3.10", "3.11", "3.12", "3.13"], reuse_venv=True)
+@session(python=["3.10", "3.11", "3.12", "3.13"], reuse_venv=True)
 def unit(session):
     """Run unit tests. Coverage is disabled by default, use --coverage to enable."""
 
@@ -67,7 +67,7 @@ def unit(session):
     )
 
 
-@session(python=["3.9", "3.10", "3.11", "3.12", "3.13"], reuse_venv=True)
+@session(python=["3.10", "3.11", "3.12", "3.13"], reuse_venv=True)
 def integration(session):
     """Run integration tests. Coverage is disabled by default, use --coverage to enable."""
     # Validate required environment variables