diff --git a/imagecodecs/_cms.pyx b/imagecodecs/_cms.pyx
index 37f9f12..dc3e778 100644
--- a/imagecodecs/_cms.pyx
+++ b/imagecodecs/_cms.pyx
@@ -942,5 +942,5 @@ cdef void _cms_log_error_handler(
     cmsContext ContextID,
     cmsUInt32Number ErrorCode,
     const char *Text
-) with gil:
-    _log_warning('CMS error: %s', Text.decode().strip())
\ No newline at end of file
+) noexcept with gil:
+    _log_warning('CMS error: %s', Text.decode().strip())
diff --git a/imagecodecs/_gif.pyx b/imagecodecs/_gif.pyx
index 82f023f..000c5bb 100644
--- a/imagecodecs/_gif.pyx
+++ b/imagecodecs/_gif.pyx
@@ -489,7 +489,7 @@ cdef int gif_input_func(
     GifFileType* gif,
     GifByteType* dst,
     int size
-) nogil:
+) noexcept nogil:
     """GIF read callback function."""
     cdef:
         memgif_t* memgif = <memgif_t*> gif.UserData
@@ -514,7 +514,7 @@ cdef int gif_output_func(
     GifFileType* gif,
     const GifByteType* src,
     int size
-) nogil:
+) noexcept nogil:
     """GIF write callback function."""
     cdef:
         memgif_t* memgif = <memgif_t*> gif.UserData
diff --git a/imagecodecs/_heif.pyx b/imagecodecs/_heif.pyx
index 408e36c..41acb6d 100644
--- a/imagecodecs/_heif.pyx
+++ b/imagecodecs/_heif.pyx
@@ -771,7 +771,7 @@ cdef heif_error heif_write_callback(
     const void* data,
     size_t size,
     void* userdata
-) nogil:
+) noexcept nogil:
     """heif_writer callback function."""
     cdef:
         output_t* output = <output_t*> userdata
diff --git a/imagecodecs/_jpeg8.pyx b/imagecodecs/_jpeg8.pyx
index 19b1ce8..5f8bc4e 100644
--- a/imagecodecs/_jpeg8.pyx
+++ b/imagecodecs/_jpeg8.pyx
@@ -393,14 +393,14 @@ ctypedef struct my_error_mgr:
     jmp_buf setjmp_buffer
 
 
-cdef void my_error_exit(jpeg_common_struct* cinfo) nogil:
+cdef void my_error_exit(jpeg_common_struct* cinfo) noexcept nogil:
     cdef:
         my_error_mgr* error = <my_error_mgr*> deref(cinfo).err
 
     longjmp(deref(error).setjmp_buffer, 1)
 
 
-cdef void my_output_message(jpeg_common_struct* cinfo) nogil:
+cdef void my_output_message(jpeg_common_struct* cinfo) noexcept nogil:
     pass
 
 
diff --git a/imagecodecs/_jpegxr.pyx b/imagecodecs/_jpegxr.pyx
index 548fcdf..b0cb11f 100644
--- a/imagecodecs/_jpegxr.pyx
+++ b/imagecodecs/_jpegxr.pyx
@@ -378,7 +378,7 @@ def jpegxr_decode(data, index=None, fp2int=False, numthreads=None, out=None):
     return out
 
 
-cdef ERR WriteWS_Memory(WMPStream* pWS, const void* pv, size_t cb) nogil:
+cdef ERR WriteWS_Memory(WMPStream* pWS, const void* pv, size_t cb) noexcept nogil:
     """Relpacement for WriteWS_Memory to keep track of bytes written."""
     if pWS.state.buf.cbCur + cb < pWS.state.buf.cbCur:
         return WMP_errBufferOverflow
@@ -395,7 +395,7 @@ cdef ERR WriteWS_Memory(WMPStream* pWS, const void* pv, size_t cb) nogil:
     return WMP_errSuccess
 
 
-cdef ERR WriteWS_Realloc(WMPStream* pWS, const void* pv, size_t cb) nogil:
+cdef ERR WriteWS_Realloc(WMPStream* pWS, const void* pv, size_t cb) noexcept nogil:
     """Relpacement for WriteWS_Memory to realloc buffers on overflow.
 
     Only use with buffers allocated by malloc.
@@ -431,7 +431,7 @@ cdef ERR WriteWS_Realloc(WMPStream* pWS, const void* pv, size_t cb) nogil:
     return WMP_errSuccess
 
 
-cdef Bool EOSWS_Realloc(WMPStream* pWS) nogil:
+cdef Bool EOSWS_Realloc(WMPStream* pWS) noexcept nogil:
     """Relpacement for EOSWS_Memory."""
     # return pWS.state.buf.cbBuf <= pWS.state.buf.cbCur
     return 1
diff --git a/imagecodecs/_png.pyx b/imagecodecs/_png.pyx
index ce2b597..bdb0f23 100644
--- a/imagecodecs/_png.pyx
+++ b/imagecodecs/_png.pyx
@@ -328,14 +328,14 @@ def png_decode(data, index=None, numthreads=None, out=None):
 cdef void png_error_callback(
     png_structp png_ptr,
     png_const_charp msg
-) with gil:
+) noexcept with gil:
     raise PngError(msg.decode().strip())
 
 
 cdef void png_warn_callback(
     png_structp png_ptr,
     png_const_charp msg
-) with gil:
+) noexcept with gil:
     _log_warning('PNG warning: %s', msg.decode().strip())
 
 
@@ -350,7 +350,7 @@ cdef void png_read_data_fn(
     png_structp png_ptr,
     png_bytep dst,
     png_size_t size
-) nogil:
+) noexcept nogil:
     """PNG read callback function."""
     cdef:
         mempng_t* mempng = <mempng_t*> png_get_io_ptr(png_ptr)
@@ -373,7 +373,7 @@ cdef void png_write_data_fn(
     png_structp png_ptr,
     png_bytep src,
     png_size_t size
-) nogil:
+) noexcept nogil:
     """PNG write callback function."""
     cdef:
         mempng_t* mempng = <mempng_t*> png_get_io_ptr(png_ptr)
@@ -404,7 +404,7 @@ cdef void png_write_data_fn(
     mempng.offset += size
 
 
-cdef void png_output_flush_fn(png_structp png_ptr) nogil:
+cdef void png_output_flush_fn(png_structp png_ptr) noexcept nogil:
     """PNG flush callback function."""
     pass
 
diff --git a/imagecodecs/_tiff.pyx b/imagecodecs/_tiff.pyx
index 488e8f5..32fc847 100644
--- a/imagecodecs/_tiff.pyx
+++ b/imagecodecs/_tiff.pyx
@@ -821,7 +821,7 @@ cdef memtif_t* memtif_open(
     return memtif
 
 
-cdef memtif_t* memtif_new(toff_t size, toff_t inc) nogil:
+cdef memtif_t* memtif_new(toff_t size, toff_t inc) noexcept nogil:
     """Return new memtif with new buffer for writing."""
     cdef:
         memtif_t* memtif = <memtif_t*> malloc(sizeof(memtif_t))
@@ -842,7 +842,7 @@ cdef memtif_t* memtif_new(toff_t size, toff_t inc) nogil:
     return memtif
 
 
-cdef void memtif_del(memtif_t* memtif) nogil:
+cdef void memtif_del(memtif_t* memtif) noexcept nogil:
     """Delete memtif."""
     if memtif != NULL:
         if memtif.owner:
@@ -854,7 +854,7 @@ cdef tsize_t memtif_TIFFReadProc(
     thandle_t handle,
     void* buf,
     tmsize_t size
-) nogil:
+) noexcept nogil:
     """Callback function to read from memtif."""
     cdef:
         memtif_t* memtif = <memtif_t*> handle
@@ -870,7 +870,7 @@ cdef tmsize_t memtif_TIFFWriteProc(
     thandle_t handle,
     void* buf,
     tmsize_t size
-) nogil:
+) noexcept nogil:
     """Callback function to write to memtif."""
     cdef:
         memtif_t* memtif = <memtif_t*> handle
@@ -897,7 +897,7 @@ cdef toff_t memtif_TIFFSeekProc(
     thandle_t handle,
     toff_t off,
     int whence
-) nogil:
+) noexcept nogil:
     """Callback function to seek to memtif."""
     cdef:
         memtif_t* memtif = <memtif_t*> handle
@@ -946,7 +946,7 @@ cdef toff_t memtif_TIFFSeekProc(
     return memtif.fpos
 
 
-cdef int memtif_TIFFCloseProc(thandle_t handle) nogil:
+cdef int memtif_TIFFCloseProc(thandle_t handle) noexcept nogil:
     """Callback function to close memtif."""
     cdef:
         memtif_t* memtif = <memtif_t*> handle
@@ -955,7 +955,7 @@ cdef int memtif_TIFFCloseProc(thandle_t handle) nogil:
     return 0
 
 
-cdef toff_t memtif_TIFFSizeProc(thandle_t handle) nogil:
+cdef toff_t memtif_TIFFSizeProc(thandle_t handle) noexcept nogil:
     """Callback function to return size of memtif."""
     cdef:
         memtif_t* memtif = <memtif_t*> handle
@@ -967,7 +967,7 @@ cdef int memtif_TIFFMapFileProc(
     thandle_t handle,
     void** base,
     toff_t* size
-) nogil:
+) noexcept nogil:
     """Callback function to map memtif."""
     cdef:
         memtif_t* memtif = <memtif_t*> handle
@@ -981,7 +981,7 @@ cdef void memtif_TIFFUnmapFileProc(
     thandle_t handle,
     void* base,
     toff_t size
-) nogil:
+) noexcept nogil:
     """Callback function to unmap memtif."""
     return
 
@@ -991,7 +991,7 @@ cdef void tif_error_handler(
     const char* module,
     const char* fmt,
     va_list args
-) nogil:
+) noexcept nogil:
     """Callback function to write libtiff error message to memtif."""
     cdef:
         memtif_t* memtif
@@ -1010,7 +1010,7 @@ cdef void tif_warning_handler(
     const char* module,
     const char* fmt,
     va_list args
-) with gil:
+) noexcept with gil:
     """Callback function to output libtiff warning message to logging."""
     cdef:
         char msg[80]