diff --git a/pyproject.toml b/pyproject.toml
index 192b4c7..99ccf6f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,16 +7,16 @@ name = "objprint"
 authors = [{name = "Tian Gao", email = "gaogaotiantian@hotmail.com"}]
 description = "A library that can print Python objects in human readable format"
 readme = "README.md"
-requires-python = ">=3.6"
+requires-python = ">=3.9"
 license = {file = "LICENSE"}
 dynamic = ["version"]
 classifiers = [
     "Development Status :: 4 - Beta",
-    "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",
     "Intended Audience :: Developers",
     "License :: OSI Approved :: Apache Software License",
     "Operating System :: OS Independent"