diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 530238c9..23d221c8 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -10,7 +10,7 @@ jobs:
     strategy:
       matrix:
         os: ["ubuntu-latest", "windows-latest", "macos-latest"]
-        py: ["3.13-dev", "3.12", "3.11", "3.10", "3.9", "3.8"]
+        py: ["3.14-dev", "3.13", "3.12", "3.11", "3.10", "3.9", "3.8"]
 
     runs-on: ${{ matrix.os }}
     name: Run test with Python ${{ matrix.py }} on ${{ matrix.os }}
@@ -26,10 +26,15 @@ jobs:
           allow-prereleases: true
           cache: "pip"
 
-      - name: Build
+      - name: Prepare
         shell: bash
         run: |
+          pip install -U pip
           pip install -r requirements.txt pytest
+
+      - name: Build
+        shell: bash
+        run: |
           make cython
           pip install .
 
diff --git a/pyproject.toml b/pyproject.toml
index e24f2b88..b1628322 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,10 +1,13 @@
 [build-system]
-requires = ["setuptools >= 69.5.1"]
+# 75.3.0 is the latest version supporting Python 3.8
+requires = ["setuptools >= 75.3.0"]
 build-backend = "setuptools.build_meta"
 
 [project]
 name = "msgpack"
 dynamic = ["version"]
+# `license = "Apache-2.0"` is preferred. But keep old syntax for Python 3.8 compatibility.
+# https://github.com/msgpack/msgpack-python/pull/637
 license = {text="Apache 2.0"}
 authors = [{name="Inada Naoki", email="songofacandy@gmail.com"}]
 description = "MessagePack serializer"
@@ -14,18 +17,17 @@ requires-python = ">=3.8"
 classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Operating System :: OS Independent",
-    "Programming Language :: Python",
-    "Programming Language :: Python :: 3",
+    "Topic :: File Formats",
+    "Intended Audience :: Developers",
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
     "Programming Language :: Python :: Implementation :: CPython",
     "Programming Language :: Python :: Implementation :: PyPy",
-    "Intended Audience :: Developers",
-    "License :: OSI Approved :: Apache Software License",
 ]
 
 [project.urls]
diff --git a/requirements.txt b/requirements.txt
index b677f068..78a2f38f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1 @@
-Cython~=3.0.11
+Cython~=3.1.1