diff --git a/.github/workflows/check.yaml b/.github/workflows/check.yaml
index 3c27013..46959ce 100644
--- a/.github/workflows/check.yaml
+++ b/.github/workflows/check.yaml
@@ -19,6 +19,8 @@ jobs:
       fail-fast: false
       matrix:
         env:
+          - "3.15"
+          - "3.15t"
           - "3.14"
           - "3.13"
           - "3.12"
diff --git a/pyproject.toml b/pyproject.toml
index 818b3fc..704b83c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,6 +30,7 @@ classifiers = [
   "Programming Language :: Python :: 3.12",
   "Programming Language :: Python :: 3.13",
   "Programming Language :: Python :: 3.14",
+  "Programming Language :: Python :: 3.15",
   "Programming Language :: Python :: Implementation :: CPython",
   "Topic :: Software Development :: Libraries :: Python Modules",
 ]
@@ -97,7 +98,7 @@ write-changes = true
 count = true
 
 [tool.pyproject-fmt]
-max_supported_python = "3.14"
+max_supported_python = "3.15"
 
 [tool.ty]
 environment.python-version = "3.14"
diff --git a/tox.toml b/tox.toml
index 67879ba..864c8ee 100644
--- a/tox.toml
+++ b/tox.toml
@@ -3,11 +3,13 @@ requires = [
   "tox-uv>=1.29",
 ]
 env_list = [
+  "3.15",
   "3.14",
   "3.13",
   "3.12",
   "3.11",
   "3.10",
+  "3.15t",
   "fix",
   "pkg_meta",
   "type",