diff --git a/pyopenjtalk/htsengine.pyx b/pyopenjtalk/htsengine.pyx
index 9936a6e..1bc2b6a 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
 
 import numpy as np
 
@@ -19,7 +20,7 @@ from .htsengine cimport (
     HTS_Engine_get_generated_speech, HTS_Engine_get_nsamples
 )
 
-cdef class HTSEngine(object):
+cdef class HTSEngine:
     """HTSEngine
 
     Args:
diff --git a/pyopenjtalk/htsengine/__init__.pxd b/pyopenjtalk/htsengine/__init__.pxd
index c24d959..6da5bb3 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":
@@ -19,4 +20,4 @@ cdef extern from "HTS_engine.h":
     size_t HTS_Engine_get_nsamples(HTS_Engine * engine)
 
     void HTS_Engine_set_speed(HTS_Engine * engine, double f)
-    void HTS_Engine_add_half_tone(HTS_Engine * engine, double f)
\ No newline at end of file
+    void HTS_Engine_add_half_tone(HTS_Engine * engine, double f)
diff --git a/pyopenjtalk/openjtalk.pyx b/pyopenjtalk/openjtalk.pyx
index 291311e..ad2b521 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
 
 import numpy as np
 
@@ -151,7 +152,7 @@ cdef inline int Mecab_load_with_userdic(Mecab *m, char* dicdir, char* userdic):
     return 1
 
 
-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 8e86bea..555885a 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 1538e05..80ff86e 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 be57ccc..a7880c2 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 38d3887..4ffab6a 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 8309288..3bdec33 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 6081757..01f7efe 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)
diff --git a/pyproject.toml b/pyproject.toml
index fe0e1fe..0599f7a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,7 +2,7 @@
 requires = [
     "setuptools>=64",
     "setuptools_scm>=8",
-    "cython>=0.28.0",
+    "cython>=3",
     "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>=3",
     "pysen",
     "types-setuptools",
     "mypy<=0.910",
diff --git a/setup.py b/setup.py
index dfac91e..14e91d2 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"),
         ],
     )
 ]