Drop Python 3.9

.github/workflows/build-test.yml

@@ -11,7 +11,7 @@ jobs:
       fail-fast: false
       matrix:
         name: [ubuntu, macos]
-        python-version: ["3.9", "3.10", "3.11"]
+        python-version: ["3.10", "3.11"]
 
         include:
           - name: ubuntu

.readthedocs.yml

@@ -9,14 +9,9 @@ version: 2
 sphinx:
   configuration: docs/source/conf.py
 
-# Workaround to enable Python 3.9
-# https://github.com/readthedocs/readthedocs.org/issues/7554#issuecomment-785114155
-build:
-  image: testing
-
 # Pyhton settings
 python:
-  version: 3.9
+  version: 3.10
   install:
       - method: pip
         path: .

setup.cfg

@@ -10,12 +10,11 @@ long_description_content_type = text/markdown
 classifiers =
     Intended Audience :: Science/Research
     License :: OSI Approved :: MIT License
-    Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3.11
 
 [options]
-python_requires = >=3.9
+python_requires = >=3.10
 packages = find_namespace:
 include_package_data = True
 install_requires =