diff --git a/.github/workflows/regression.yml b/.github/workflows/regression.yml
index 2e5ea941..e366f29d 100644
--- a/.github/workflows/regression.yml
+++ b/.github/workflows/regression.yml
@@ -49,10 +49,10 @@ jobs:
           macos-latest,
         ]
         python-version: [
-          '3.9',
           '3.10',
           '3.11',
           '3.12',
+          '3.13',
         ]
     steps:
       - uses: actions/checkout@v4
diff --git a/tox.ini b/tox.ini
index da91d7aa..8c43ac30 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,8 +7,6 @@ envlist =
     py312
     py311
     py310
-    py39
-    py38
 
 [testenv]
 description = Attempt to build and install the package
@@ -38,7 +36,7 @@ commands =
 
 [gh-actions]
 python =
+    3.13: py313
     3.12: py312
     3.11: py311
     3.10: py310
-    3.9: py39