feat: Drop support for python 3.9

Python 3.9 was EOL as of October 31st, 2025.

Author: keelerm84

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ 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:
       - uses: actions/checkout@v4
@@ -71,7 +71,7 @@ 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:
       - uses: actions/checkout@v4

.github/workflows/manual-publish.yml

@@ -21,7 +21,7 @@ jobs:
 
       - uses: actions/setup-python@v5
         with:
-          python-version: 3.9
+          python-version: 3.10
 
       - name: Install poetry
         uses: abatilo/actions-poetry@7b6d33e44b4f08d7021a1dee3c044e9c253d6439

.github/workflows/release-please.yml

@@ -27,7 +27,7 @@ jobs:
       - uses: actions/setup-python@v5
         if: ${{ steps.release.outputs.releases_created == 'true' }}
         with:
-          python-version: 3.9
+          python-version: 3.10
 
       - name: Install poetry
         if: ${{ steps.release.outputs.releases_created == 'true' }}

README.md

@@ -14,7 +14,7 @@
 
 ## Supported Python versions
 
-This version of the LaunchDarkly SDK is compatible with Python 3.9+.
+This version of the LaunchDarkly SDK is compatible with Python 3.10+.
 
 ## Getting started
 

pyproject.toml

@@ -13,7 +13,6 @@ classifiers = [
     "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",
@@ -27,7 +26,7 @@ exclude = [
 ]
 
 [tool.poetry.dependencies]
-python = ">=3.9"
+python = ">=3.10"
 certifi = ">=2018.4.16"
 expiringdict = ">=1.1.4"
 pyRFC3339 = ">=1.0"
@@ -85,7 +84,7 @@ urllib3 = ">=1.26.0"
 jinja2 = "3.1.3"
 
 [tool.mypy]
-python_version = "3.9"
+python_version = "3.10"
 ignore_missing_imports = true
 install_types = true
 non_interactive = true