diff --git a/pyopenjtalk/htsengine.pyx b/pyopenjtalk/htsengine.pyx
index b8ed5e6..cddd16b 100644
--- a/pyopenjtalk/htsengine.pyx
+++ b/pyopenjtalk/htsengine.pyx
@@ -1,6 +1,7 @@
 # coding: utf-8
 # cython: boundscheck=True, wraparound=True
 # cython: c_string_type=unicode, c_string_encoding=ascii
+# cython: language_level=3
 
 from contextlib import contextmanager
 from threading import RLock
@@ -33,7 +34,7 @@ def _generate_lock_manager():
     return f
 
 
-cdef class HTSEngine(object):
+cdef class HTSEngine:
     """HTSEngine
 
     Args:
diff --git a/pyopenjtalk/htsengine/__init__.pxd b/pyopenjtalk/htsengine/__init__.pxd
index d8f4fe4..e919505 100644
--- a/pyopenjtalk/htsengine/__init__.pxd
+++ b/pyopenjtalk/htsengine/__init__.pxd
@@ -1,4 +1,5 @@
 # distutils: language = c++
+# cython: language_level=3
 
 
 cdef extern from "HTS_engine.h":
diff --git a/pyopenjtalk/openjtalk.pyx b/pyopenjtalk/openjtalk.pyx
index 0113844..bd8234d 100644
--- a/pyopenjtalk/openjtalk.pyx
+++ b/pyopenjtalk/openjtalk.pyx
@@ -1,6 +1,7 @@
 # coding: utf-8
 # cython: boundscheck=True, wraparound=True
 # cython: c_string_type=unicode, c_string_encoding=ascii
+# cython: language_level=3
 
 from contextlib import contextmanager
 from threading import Lock
@@ -157,7 +158,7 @@ def _generate_lock_manager():
     return f
 
 
-cdef class OpenJTalk(object):
+cdef class OpenJTalk:
     """OpenJTalk
 
     Args:
diff --git a/pyopenjtalk/openjtalk/__init__.pxd b/pyopenjtalk/openjtalk/__init__.pxd
index e69de29..f08f4aa 100644
--- a/pyopenjtalk/openjtalk/__init__.pxd
+++ b/pyopenjtalk/openjtalk/__init__.pxd
@@ -0,0 +1 @@
+# cython: language_level=3
diff --git a/pyopenjtalk/openjtalk/jpcommon.pxd b/pyopenjtalk/openjtalk/jpcommon.pxd
index c78dd0f..d2b121a 100644
--- a/pyopenjtalk/openjtalk/jpcommon.pxd
+++ b/pyopenjtalk/openjtalk/jpcommon.pxd
@@ -1,4 +1,5 @@
 # distutils: language = c++
+# cython: language_level=3
 
 from libc.stdio cimport FILE
 
diff --git a/pyopenjtalk/openjtalk/mecab.pxd b/pyopenjtalk/openjtalk/mecab.pxd
index 2c31912..746ac18 100644
--- a/pyopenjtalk/openjtalk/mecab.pxd
+++ b/pyopenjtalk/openjtalk/mecab.pxd
@@ -1,4 +1,5 @@
 # distutils: language = c++
+# cython: language_level=3
 
 cdef extern from "mecab.h":
     cdef cppclass Mecab:
diff --git a/pyopenjtalk/openjtalk/mecab2njd.pxd b/pyopenjtalk/openjtalk/mecab2njd.pxd
index fdfc1b0..33b6277 100644
--- a/pyopenjtalk/openjtalk/mecab2njd.pxd
+++ b/pyopenjtalk/openjtalk/mecab2njd.pxd
@@ -1,4 +1,5 @@
 # distutils: language = c++
+# cython: language_level=3
 
 from .njd cimport NJD
 
diff --git a/pyopenjtalk/openjtalk/njd.pxd b/pyopenjtalk/openjtalk/njd.pxd
index f745f8d..5f7a3ba 100644
--- a/pyopenjtalk/openjtalk/njd.pxd
+++ b/pyopenjtalk/openjtalk/njd.pxd
@@ -1,4 +1,5 @@
 # distutils: language = c++
+# cython: language_level=3
 
 from libc.stdio cimport FILE
 
diff --git a/pyopenjtalk/openjtalk/njd2jpcommon.pxd b/pyopenjtalk/openjtalk/njd2jpcommon.pxd
index a84c859..7069815 100644
--- a/pyopenjtalk/openjtalk/njd2jpcommon.pxd
+++ b/pyopenjtalk/openjtalk/njd2jpcommon.pxd
@@ -1,4 +1,5 @@
 # distutils: language = c++
+# cython: language_level=3
 
 from .jpcommon cimport JPCommon
 from .njd cimport NJD
diff --git a/pyopenjtalk/openjtalk/text2mecab.pxd b/pyopenjtalk/openjtalk/text2mecab.pxd
index 1d26049..83d79d8 100644
--- a/pyopenjtalk/openjtalk/text2mecab.pxd
+++ b/pyopenjtalk/openjtalk/text2mecab.pxd
@@ -1,4 +1,5 @@
 # distutils: language = c++
+# cython: language_level=3
 
 cdef extern from "text2mecab.h":
     void text2mecab(char *output, const char *input) nogil
diff --git a/pyproject.toml b/pyproject.toml
index d56bac5..995aae7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,7 +2,7 @@
 requires = [
     "setuptools>=64",
     "setuptools_scm>=8",
-    "cython>=0.28.0",
+    "cython>=0.29.16",
     "cmake",
     "numpy>=1.25.0; python_version>='3.9'",
     "oldest-supported-numpy; python_version<'3.9'",
@@ -52,7 +52,7 @@ docs = [
     "jupyter",
 ]
 dev = [
-    "cython>=0.28.0",
+    "cython>=0.29.16",
     "pysen",
     "types-setuptools",
     "mypy<=0.910",
diff --git a/setup.py b/setup.py
index c67d3c4..b7b2658 100644
--- a/setup.py
+++ b/setup.py
@@ -23,6 +23,18 @@ def msvc_extra_compile_args(compile_args):
     return list(chain(compile_args, xs))
 
 
+msvc_define_macros_config = [
+    ("_CRT_NONSTDC_NO_WARNINGS", None),
+    ("_CRT_SECURE_NO_WARNINGS", None),
+]
+
+
+def msvc_define_macros(macros):
+    mns = set([i[0] for i in macros])
+    xs = filter(lambda x: x[0] not in mns, msvc_define_macros_config)
+    return list(chain(macros, xs))
+
+
 class custom_build_ext(setuptools.command.build_ext.build_ext):
     def build_extensions(self):
         compiler_type_is_msvc = self.compiler.compiler_type == "msvc"
@@ -33,6 +45,9 @@ def build_extensions(self):
                     if hasattr(entry, "extra_compile_args")
                     else []
                 )
+                entry.define_macros = msvc_define_macros(
+                    entry.define_macros if hasattr(entry, "define_macros") else []
+                )
 
         setuptools.command.build_ext.build_ext.build_extensions(self)
 
@@ -148,6 +163,7 @@ def check_cmake_in_path():
         language="c++",
         define_macros=[
             ("AUDIO_PLAY_NONE", None),
+            ("NPY_NO_DEPRECATED_API", "NPY_1_7_API_VERSION"),
         ],
     )
 ]