diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index aae12eb8..5d07d193 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -43,6 +43,7 @@ jobs:
           - "3.10"
           - "3.11"
           - "3.12"
+          - "3.13"
         platform:
           - ubuntu-latest
           - macos-latest
diff --git a/pyproject.toml b/pyproject.toml
index 24e50529..de5da1e8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,6 +26,7 @@ classifiers = [
 	"Programming Language :: Python :: 3.10",
 	"Programming Language :: Python :: 3.11",
 	"Programming Language :: Python :: 3.12",
+	"Programming Language :: Python :: 3.13",
 	"Programming Language :: Python :: Implementation :: CPython",
 ]
 requires-python = ">=3.8"
@@ -66,10 +67,7 @@ keyring = ["keyring >= 15.1"]
 twine = "twine.__main__:main"
 
 [tool.setuptools]
-packages = [
-	"twine",
-	"twine.commands",
-]
+packages = ["twine", "twine.commands"]
 include-package-data = true
 license-files = ["LICENSE"]
 
diff --git a/tox.ini b/tox.ini
index 5a85ef42..e5c71aab 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 minversion = 3.8
-envlist = lint,types,py{38,39,310,311,312},integration,docs
+envlist = lint,types,py{38,39,310,311,312,313},integration,docs
 isolated_build = True
 
 [testenv]