diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index c4162eba..efc16a5c 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -73,7 +73,7 @@ jobs:
     strategy:
       matrix:
           # Python versions common to lowest and latest
-          python-version: ["3.9", "3.10", "pypy-3.11"]
+          python-version: ["3.10", "pypy-3.11"]
           twisted-version: ["lowest", "latest"]
           experimental: [false]
 
@@ -128,7 +128,6 @@ jobs:
       shell: python
       run: |
         table = {
-          "3.9": "py39",
           "3.10": "py310",
           "3.11": "py311",
           "3.12": "py312",
diff --git a/tox.ini b/tox.ini
index 1a5a47d4..bdbd40da 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,7 +1,6 @@
 [tox]
 envlist =
-    py39-twisted_lowest,
-    {pypy3,py39,py310,py311,py312,py313,py314}-twisted_latest,
+    {pypy3,py310,py311,py312,py313,py314}-twisted_latest,
     {pypy3,py310,py311,py312,py313,py314}-twisted_trunk,
     check-manifest, flake8, docs, coverage-report
 isolated_build = true
@@ -75,7 +74,7 @@ commands =
     sphinx-build -b html . html
 
 [testenv:coverage-report]
-depends = pypy3,py39,py310,py311,py312,py313,py314
+depends = py*
 commands =
     coverage combine
     coverage report