require Python 3.9

Author: minrk

.github/workflows/tests.yml

@@ -24,10 +24,8 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        python-version: ["3.8", "3.13"]
+        python-version: ["3.9", "3.13"]
         include:
-          - os: ubuntu-latest
-            python-version: "3.9"
           - os: ubuntu-latest
             python-version: "3.10"
           - os: ubuntu-latest

pyproject.toml

@@ -20,7 +20,7 @@ classifiers = [
     "Programming Language :: Python",
     "Typing :: Typed",
 ]
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 dynamic = ["version"]
 
 [project.urls]
@@ -86,7 +86,7 @@ build = [
 
 [tool.mypy]
 files = "traitlets"
-python_version = "3.8"
+python_version = "3.9"
 strict = true
 enable_error_code = ["ignore-without-code", "redundant-expr", "truthy-bool"]
 pretty = true