diff --git a/pyproject.toml b/pyproject.toml
index b78b5c2991..df4f2a5539 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -31,6 +31,7 @@ classifiers = [
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
+  "Programming Language :: Python :: 3.13",
 ]
 dynamic = [
   "version",
diff --git a/testdata/empty_project/pyproject.toml b/testdata/empty_project/pyproject.toml
index 9b59eaa14c..8f29ebbbd6 100644
--- a/testdata/empty_project/pyproject.toml
+++ b/testdata/empty_project/pyproject.toml
@@ -20,6 +20,7 @@ classifiers = [
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
+  "Programming Language :: Python :: 3.13",
 ]
 scripts.empty-project = "empty_project.main:cli"
 entry-points."pipx.run".empty-project = "empty_project.main:cli"