diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 60f66f04..1820b30d 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -9,7 +9,7 @@ jobs:
     strategy:
       matrix:
         # Keep this in sync with tox.ini
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
         platform: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.platform }}
     steps:
diff --git a/tox.ini b/tox.ini
index 40b1daa8..4984790a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,7 +2,7 @@
 isolated_build = true
 envlist =
     # Keep this in sync with .github/workflows/main.yml
-    py{38,39,310,311,312}
+    py{38,39,310,311,312,313}
     formatting
     typecheck
     lint
@@ -14,8 +14,9 @@ python =
     3.8: py38
     3.9: py39
     3.10: py310
-    3.11: py311, formatting, typecheck, lint, docs, release_notes
-    3.12: py312
+    3.11: py311
+    3.12: py312, formatting, typecheck, lint, docs, release_notes
+    3.13: py313
 
 [testenv]
 deps =
@@ -25,7 +26,6 @@ commands =
     pytest {posargs}
 
 [testenv:formatting]
-basepython = python312
 skip_install = true
 deps =
     black