diff --git a/pyproject.toml b/pyproject.toml
index 954c82f..474029f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,7 +18,7 @@ enable_isort = true
 enable_mypy = false
 mypy_preset = "entry"
 line_length = 88
-py_version = "py37"
+py_version = "py38"
 
 [[tool.pysen.lint.mypy_targets]]
 paths = ["pysptk", "tests"]
diff --git a/setup.py b/setup.py
index ce7ba5b..6ea932a 100644
--- a/setup.py
+++ b/setup.py
@@ -178,10 +178,10 @@ def finalize_options(self):
         "Programming Language :: Cython",
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
+        "Programming Language :: Python :: 3.11",
         "License :: OSI Approved :: MIT License",
         "Topic :: Scientific/Engineering",
         "Topic :: Software Development",