diff --git a/README.md b/README.md
index 29698743..f30a498e 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ will be very helpful.
 ### Optional Packages
 
 - [lhafile - FS Edition][2]: required to use ```.lha``` file scanner
-- [cython][3]: (version >= **0.29**) required to rebuild the native module
+- [cython][3]: (version >= **3.0.0**) required to rebuild the native module
 
 [1]: https://pip.pypa.io/en/stable/installation/
 [2]: https://github.com/FrodeSolheim/python-lhafile
diff --git a/machine/pycpu.pyx b/machine/pycpu.pyx
index 7eaa57c9..8fabd704 100644
--- a/machine/pycpu.pyx
+++ b/machine/pycpu.pyx
@@ -41,15 +41,15 @@ cdef extern from "m68k.h":
 
 # wrapper
 cdef object pc_changed_func
-cdef void pc_changed_func_wrapper(unsigned int new_pc):
+cdef void pc_changed_func_wrapper(unsigned int new_pc) noexcept:
   pc_changed_func(new_pc)
 
 cdef object reset_instr_func
-cdef void reset_instr_func_wrapper():
+cdef void reset_instr_func_wrapper() noexcept:
   reset_instr_func()
 
 cdef object instr_hook_func
-cdef void instr_hook_func_wrapper(unsigned int pc):
+cdef void instr_hook_func_wrapper(unsigned int pc) noexcept:
   instr_hook_func()
 
 # public CPUContext
diff --git a/machine/pymem.pyx b/machine/pymem.pyx
index 020efa56..e2db01e5 100644
--- a/machine/pymem.pyx
+++ b/machine/pymem.pyx
@@ -51,7 +51,7 @@ cdef check_mem_exc():
     mem_callback_exc = None
     raise exc[0], exc[1], exc[2]
 
-cdef void trace_func_wrapper(int mode, int width, uint addr, uint val, void *ctx):
+cdef void trace_func_wrapper(int mode, int width, uint addr, uint val, void *ctx) noexcept:
   cdef object py_func = <object>ctx
   try:
     py_func(chr(mode), width, addr, val)
@@ -60,7 +60,7 @@ cdef void trace_func_wrapper(int mode, int width, uint addr, uint val, void *ctx
     mem_callback_exc = sys.exc_info()
     m68k_end_timeslice()
 
-cdef void invalid_func_wrapper(int mode, int width, uint addr, void *ctx):
+cdef void invalid_func_wrapper(int mode, int width, uint addr, void *ctx) noexcept:
   cdef object py_func = <object>ctx
   try:
     py_func(chr(mode), width, addr)
@@ -69,7 +69,7 @@ cdef void invalid_func_wrapper(int mode, int width, uint addr, void *ctx):
     mem_callback_exc = sys.exc_info()
     m68k_end_timeslice()
 
-cdef uint special_read_func_wrapper(uint addr, void *ctx):
+cdef uint special_read_func_wrapper(uint addr, void *ctx) noexcept:
   cdef object py_func = <object>ctx
   try:
     return py_func(addr)
@@ -79,7 +79,7 @@ cdef uint special_read_func_wrapper(uint addr, void *ctx):
     m68k_end_timeslice()
     return 0
 
-cdef void special_write_func_wrapper(uint addr, uint value, void *ctx):
+cdef void special_write_func_wrapper(uint addr, uint value, void *ctx) noexcept:
   cdef object py_func = <object>ctx
   try:
     py_func(addr, value)
diff --git a/machine/pytraps.pyx b/machine/pytraps.pyx
index cd5799f1..0dd4c0d2 100644
--- a/machine/pytraps.pyx
+++ b/machine/pytraps.pyx
@@ -13,7 +13,7 @@ cdef object trap_exc_func
 
 from cpython.exc cimport PyErr_Print
 
-cdef void trap_wrapper(uint opcode, uint pc, void *data):
+cdef void trap_wrapper(uint opcode, uint pc, void *data) noexcept:
   cdef object py_func = <object>data
   try:
     py_func(opcode, pc)
diff --git a/pyproject.toml b/pyproject.toml
index 48ad93e0..8af73fc5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools", "setuptools-scm", "cython"]
+requires = ["setuptools", "setuptools-scm", "cython >= 3.0.0"]
 build-backend = "setuptools.build_meta"
 
 [project]
diff --git a/setup.py b/setup.py
index e16fcff5..b655bfd3 100644
--- a/setup.py
+++ b/setup.py
@@ -33,8 +33,8 @@
         from Cython import __version__ as cyver
 
         print("cython version:", cyver)
-        if parse_version(cyver) < parse_version("0.25"):
-            print("cython is too old < 0.25! please update first!")
+        if parse_version(cyver) < parse_version("3.0"):
+            print("cython is too old < 3.0! please update first!")
             sys.exit(1)
     except ImportError:
         print("cython is too old! please update first!")
@@ -209,7 +209,7 @@ def run(self):
 # use cython?
 if use_cython:
     sourcefiles.append(cython_file)
-    extensions = cythonize(extensions)
+    extensions = cythonize(extensions, language_level="3str")
 else:
     sourcefiles.append(ext_file)