drop support for Python < 3.9

Author: yosida95

.circleci/config.yml

@@ -39,7 +39,8 @@ workflows:
           matrix:
             parameters:
               pythonversion:
-                - '3.6'
-                - '3.7'
-                - '3.8'
                 - '3.9'
+                - '3.10'
+                - '3.11'
+                - '3.12'
+                - '3.13'

pyproject.toml

@@ -14,9 +14,11 @@ classifiers = [
     "License :: OSI Approved :: Apache Software License",
     "Operating System :: OS Independent",
     "Programming Language :: Python",
-    "Programming Language :: Python :: 3.6",
-    "Programming Language :: Python :: 3.7",
-    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "Topic :: Internet :: WWW/HTTP",
     "Topic :: Security",
     "Topic :: Software Development :: Libraries :: Python Modules",
@@ -26,7 +28,7 @@ dependencies = [
     "cryptography >= 3.1, != 3.4.0",
 ]
 
-requires-python = ">= 3.6"
+requires-python = ">= 3.9"
 
 authors = [
   {name = "Kohei YOSHIDA", email = "kohei.yoshida@gehirn.co.jp"},