diff --git a/pyproject.toml b/pyproject.toml
index e537af831..ba40f3b61 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,7 +2,7 @@
 build-backend = "scikit_build_core.build"
 requires = [
     "scikit-build-core >=0.9.3",
-    "nanobind >=1.9.2",
+    "nanobind >=3.0",
     # https://numpy.org/doc/stable/dev/depending_on_numpy.html#build-time-dependency
     # Just depending on numpy will automatically expose the oldest supported ABI.
     # - Retrieved 2024-06-24, AK
@@ -11,7 +11,7 @@ requires = [
 
 [project]
 name = "pyopencl"
-version = "2026.1.2"
+version = "2026.1.3"
 description = "Python wrapper for OpenCL"
 readme = "README.rst"
 license = "MIT"
diff --git a/src/wrap_cl_part_1.cpp b/src/wrap_cl_part_1.cpp
index 3f25eaca1..5b4afc4db 100644
--- a/src/wrap_cl_part_1.cpp
+++ b/src/wrap_cl_part_1.cpp
@@ -99,9 +99,9 @@ void pyopencl_expose_part_1(py::module_ &m)
                   py_dev_type);
             )
           },
-          py::arg("devices").none(true)=py::none(),
-          py::arg("properties").none(true)=py::none(),
-          py::arg("dev_type").none(true)=py::none()
+          py::arg("devices").none()=py::none(),
+          py::arg("properties").none()=py::none(),
+          py::arg("dev_type").none()=py::none()
           )
       .DEF_SIMPLE_METHOD(get_info)
       PYOPENCL_EXPOSE_EQUALITY_TESTS
@@ -126,7 +126,7 @@ void pyopencl_expose_part_1(py::module_ &m)
       .def(
         py::init<const context &, const device *, py::object>(),
         py::arg("context"),
-        py::arg("device").none(true)=py::none(),
+        py::arg("device").none()=py::none(),
         py::arg("properties")=py::cast(0))
       .def("_finalize", &cls::finalize)
       .DEF_SIMPLE_METHOD(get_info)
@@ -173,18 +173,18 @@ void pyopencl_expose_part_1(py::module_ &m)
 
 #if PYOPENCL_CL_VERSION >= 0x1020
   m.def("_enqueue_marker_with_wait_list", enqueue_marker_with_wait_list,
-      py::arg("queue"), py::arg("wait_for").none(true)=py::none()
+      py::arg("queue"), py::arg("wait_for").none()=py::none()
       );
 #endif
   m.def("_enqueue_marker", enqueue_marker,
       py::arg("queue")
       );
   m.def("_enqueue_wait_for_events", enqueue_wait_for_events,
-      py::arg("queue"), py::arg("wait_for").none(true)=py::none());
+      py::arg("queue"), py::arg("wait_for").none()=py::none());
 
 #if PYOPENCL_CL_VERSION >= 0x1020
   m.def("_enqueue_barrier_with_wait_list", enqueue_barrier_with_wait_list,
-      py::arg("queue"), py::arg("wait_for").none(true)=py::none()
+      py::arg("queue"), py::arg("wait_for").none()=py::none()
       );
 #endif
   m.def("_enqueue_barrier", enqueue_barrier, py::arg("queue"));
@@ -253,7 +253,7 @@ void pyopencl_expose_part_1(py::module_ &m)
       py::arg("queue"),
       py::arg("mem_objects"),
       py::arg("flags")=0,
-      py::arg("wait_for").none(true)=py::none()
+      py::arg("wait_for").none()=py::none()
       );
 #endif
 
@@ -270,7 +270,7 @@ void pyopencl_expose_part_1(py::module_ &m)
           py::arg("context"),
           py::arg("flags"),
           py::arg("size")=0,
-          py::arg("hostbuf").none(true)=py::none()
+          py::arg("hostbuf").none()=py::none()
           )
 #if PYOPENCL_CL_VERSION >= 0x1010
       .def("get_sub_region", &cls::get_sub_region,
@@ -294,7 +294,7 @@ void pyopencl_expose_part_1(py::module_ &m)
       py::arg("mem"),
       py::arg("hostbuf"),
       py::arg("src_offset")=0,
-      py::arg("wait_for").none(true)=py::none(),
+      py::arg("wait_for").none()=py::none(),
       py::arg("is_blocking")=true
       );
   m.def("_enqueue_write_buffer", enqueue_write_buffer,
@@ -302,7 +302,7 @@ void pyopencl_expose_part_1(py::module_ &m)
       py::arg("mem"),
       py::arg("hostbuf"),
       py::arg("dst_offset")=0,
-      py::arg("wait_for").none(true)=py::none(),
+      py::arg("wait_for").none()=py::none(),
       py::arg("is_blocking")=true
       );
   m.def("_enqueue_copy_buffer", enqueue_copy_buffer,
@@ -312,7 +312,7 @@ void pyopencl_expose_part_1(py::module_ &m)
       py::arg("byte_count")=-1,
       py::arg("src_offset")=0,
       py::arg("dst_offset")=0,
-      py::arg("wait_for").none(true)=py::none()
+      py::arg("wait_for").none()=py::none()
       );
 
 #ifdef CL_DEVICE_P2P_DEVICES_AMD
@@ -321,8 +321,8 @@ void pyopencl_expose_part_1(py::module_ &m)
       py::arg("queue"),
       py::arg("src"),
       py::arg("dst"),
-      py::arg("byte_count").none(true)=py::none(),
-      py::arg("wait_for").none(true)=py::none()
+      py::arg("byte_count").none()=py::none(),
+      py::arg("wait_for").none()=py::none()
       );
 #endif
 
@@ -338,9 +338,9 @@ void pyopencl_expose_part_1(py::module_ &m)
       py::arg("buffer_origin"),
       py::arg("host_origin"),
       py::arg("region"),
-      py::arg("buffer_pitches").none(true)=py::none(),
-      py::arg("host_pitches").none(true)=py::none(),
-      py::arg("wait_for").none(true)=py::none(),
+      py::arg("buffer_pitches").none()=py::none(),
+      py::arg("host_pitches").none()=py::none(),
+      py::arg("wait_for").none()=py::none(),
       py::arg("is_blocking")=true
       );
   m.def("_enqueue_write_buffer_rect", enqueue_write_buffer_rect,
@@ -350,9 +350,9 @@ void pyopencl_expose_part_1(py::module_ &m)
       py::arg("buffer_origin"),
       py::arg("host_origin"),
       py::arg("region"),
-      py::arg("buffer_pitches").none(true)=py::none(),
-      py::arg("host_pitches").none(true)=py::none(),
-      py::arg("wait_for").none(true)=py::none(),
+      py::arg("buffer_pitches").none()=py::none(),
+      py::arg("host_pitches").none()=py::none(),
+      py::arg("wait_for").none()=py::none(),
       py::arg("is_blocking")=true
       );
   m.def("_enqueue_copy_buffer_rect", enqueue_copy_buffer_rect,
@@ -362,9 +362,9 @@ void pyopencl_expose_part_1(py::module_ &m)
       py::arg("src_origin"),
       py::arg("dst_origin"),
       py::arg("region"),
-      py::arg("src_pitches").none(true)=py::none(),
-      py::arg("dst_pitches").none(true)=py::none(),
-      py::arg("wait_for").none(true)=py::none()
+      py::arg("src_pitches").none()=py::none(),
+      py::arg("dst_pitches").none()=py::none(),
+      py::arg("wait_for").none()=py::none()
       );
 #endif
 
@@ -376,7 +376,7 @@ void pyopencl_expose_part_1(py::module_ &m)
   m.def("_enqueue_fill_buffer", enqueue_fill_buffer,
       py::arg("queue"), py::arg("mem"), py::arg("pattern"),
       py::arg("offset"), py::arg("size"),
-      py::arg("wait_for").none(true)=py::none());
+      py::arg("wait_for").none()=py::none());
 #endif
 }
 
diff --git a/src/wrap_cl_part_2.cpp b/src/wrap_cl_part_2.cpp
index e87c672d2..3d5253269 100644
--- a/src/wrap_cl_part_2.cpp
+++ b/src/wrap_cl_part_2.cpp
@@ -135,9 +135,9 @@ void pyopencl_expose_part_2(py::module_ &m)
           py::arg("context"),
           py::arg("flags"),
           py::arg("format"),
-          py::arg("shape").none(true)=py::none(),
-          py::arg("pitches").none(true)=py::none(),
-          py::arg("hostbuf").none(true)=py::none()
+          py::arg("shape").none()=py::none(),
+          py::arg("pitches").none()=py::none(),
+          py::arg("hostbuf").none()=py::none()
           )
 #if PYOPENCL_CL_VERSION >= 0x1020
       .def_static(
@@ -161,7 +161,7 @@ void pyopencl_expose_part_2(py::module_ &m)
           py::arg("flags"),
           py::arg("format"),
           py::arg("desc"),
-          py::arg("hostbuf").none(true)=py::none()
+          py::arg("hostbuf").none()=py::none()
           )
 #endif
       .DEF_SIMPLE_METHOD(get_image_info)
@@ -287,8 +287,8 @@ void pyopencl_expose_part_2(py::module_ &m)
     typedef memory_map cls;
     py::class_<cls>(m, "MemoryMap", py::dynamic_attr())
       .def("release", &cls::release,
-          py::arg("queue").none(true)=nullptr,
-          py::arg("wait_for").none(true)=py::none()
+          py::arg("queue").none()=nullptr,
+          py::arg("wait_for").none()=py::none()
           )
       ;
   }
@@ -303,8 +303,8 @@ void pyopencl_expose_part_2(py::module_ &m)
       py::arg("shape"),
       py::arg("dtype"),
       py::arg("order")="C",
-      py::arg("strides").none(true)=py::none(),
-      py::arg("wait_for").none(true)=py::none(),
+      py::arg("strides").none()=py::none(),
+      py::arg("wait_for").none()=py::none(),
       py::arg("is_blocking")=true);
   m.def("enqueue_map_image", enqueue_map_image,
       py::arg("queue"),
@@ -315,8 +315,8 @@ void pyopencl_expose_part_2(py::module_ &m)
       py::arg("shape"),
       py::arg("dtype"),
       py::arg("order")="C",
-      py::arg("strides").none(true)=py::none(),
-      py::arg("wait_for").none(true)=py::none(),
+      py::arg("strides").none()=py::none(),
+      py::arg("wait_for").none()=py::none(),
       py::arg("is_blocking")=true);
 #endif
 
@@ -389,14 +389,14 @@ void pyopencl_expose_part_2(py::module_ &m)
           py::arg("size"),
           py::arg("alignment"),
           py::arg("flags"),
-          py::arg("queue").none(true)=py::none()
+          py::arg("queue").none()=py::none()
           )
       .DEF_SIMPLE_METHOD(release)
       .def("enqueue_release", &cls::enqueue_release,
           ":returns: a :class:`pyopencl.Event`\n\n"
           "|std-enqueue-blurb|",
-          py::arg("queue").none(true)=py::none(),
-          py::arg("wait_for").none(true)=py::none()
+          py::arg("queue").none()=py::none(),
+          py::arg("wait_for").none()=py::none()
           )
       PYOPENCL_EXPOSE_EQUALITY_TESTS
       .def("__hash__", [](cls &self) { return (intptr_t) self.svm_ptr(); })
@@ -426,16 +426,16 @@ void pyopencl_expose_part_2(py::module_ &m)
       py::arg("is_blocking"),
       py::arg("dst"),
       py::arg("src"),
-      py::arg("wait_for").none(true)=py::none(),
-      py::arg("byte_count").none(true)=py::none()
+      py::arg("wait_for").none()=py::none(),
+      py::arg("byte_count").none()=py::none()
       );
 
   m.def("_enqueue_svm_memfill", enqueue_svm_memfill,
       py::arg("queue"),
       py::arg("dst"),
       py::arg("pattern"),
-      py::arg("byte_count").none(true)=py::none(),
-      py::arg("wait_for").none(true)=py::none()
+      py::arg("byte_count").none()=py::none(),
+      py::arg("wait_for").none()=py::none()
       );
 
   m.def("_enqueue_svm_map", enqueue_svm_map,
@@ -443,14 +443,14 @@ void pyopencl_expose_part_2(py::module_ &m)
       py::arg("is_blocking"),
       py::arg("flags"),
       py::arg("svm"),
-      py::arg("wait_for").none(true)=py::none(),
-      py::arg("size").none(true)=py::none()
+      py::arg("wait_for").none()=py::none(),
+      py::arg("size").none()=py::none()
       );
 
   m.def("_enqueue_svm_unmap", enqueue_svm_unmap,
       py::arg("queue"),
       py::arg("svm"),
-      py::arg("wait_for").none(true)=py::none()
+      py::arg("wait_for").none()=py::none()
       );
 #endif
 
@@ -458,8 +458,8 @@ void pyopencl_expose_part_2(py::module_ &m)
   m.def("_enqueue_svm_migrate_mem", enqueue_svm_migratemem,
       py::arg("queue"),
       py::arg("svms"),
-      py::arg("flags").none(true)=py::none(),
-      py::arg("wait_for").none(true)=py::none()
+      py::arg("flags").none()=py::none(),
+      py::arg("wait_for").none()=py::none()
       );
 #endif
 
@@ -531,17 +531,17 @@ void pyopencl_expose_part_2(py::module_ &m)
       .DEF_SIMPLE_METHOD(get_build_info)
       .def("_build", &cls::build,
           py::arg("options")="",
-          py::arg("devices").none(true)=py::none())
+          py::arg("devices").none()=py::none())
 #if PYOPENCL_CL_VERSION >= 0x1020
       .def("compile", &cls::compile,
           py::arg("options")="",
-          py::arg("devices").none(true)=py::none(),
+          py::arg("devices").none()=py::none(),
           py::arg("headers")=py::list())
       .def_static("link", &link_program,
           py::arg("context"),
           py::arg("programs"),
           py::arg("options")="",
-          py::arg("devices").none(true)=py::none()
+          py::arg("devices").none()=py::none()
           )
 #endif
 #if PYOPENCL_CL_VERSION >= 0x2020
@@ -607,7 +607,7 @@ void pyopencl_expose_part_2(py::module_ &m)
           })
       .def("set_arg", &cls::set_arg,
           py::arg("arg_index"),
-          py::arg("arg").none(true)
+          py::arg("arg").none()
         )
 #if PYOPENCL_CL_VERSION >= 0x1020
       .DEF_SIMPLE_METHOD(get_arg_info)
@@ -619,7 +619,7 @@ void pyopencl_expose_part_2(py::module_ &m)
       .def("get_sub_group_info", &cls::get_sub_group_info,
           py::arg("device"),
           py::arg("param"),
-          py::arg("input_value").none(true)=py::none()
+          py::arg("input_value").none()=py::none()
           )
 #endif
       .def("__call__", &cls::enqueue)
@@ -642,9 +642,9 @@ void pyopencl_expose_part_2(py::module_ &m)
       py::arg("queue"),
       py::arg("kernel"),
       py::arg("global_work_size"),
-      py::arg("local_work_size").none(true),
-      py::arg("global_work_offset").none(true)=py::none(),
-      py::arg("wait_for").none(true)=py::none(),
+      py::arg("local_work_size").none(),
+      py::arg("global_work_offset").none()=py::none(),
+      py::arg("wait_for").none()=py::none(),
       py::arg("g_times_l")=false,
       py::arg("allow_empty_ndrange")=false
       );
@@ -717,19 +717,19 @@ void pyopencl_expose_part_2(py::module_ &m)
   m.def("enqueue_acquire_gl_objects", enqueue_acquire_gl_objects,
       py::arg("queue"),
       py::arg("mem_objects"),
-      py::arg("wait_for").none(true)=py::none()
+      py::arg("wait_for").none()=py::none()
       );
   m.def("enqueue_release_gl_objects", enqueue_release_gl_objects,
       py::arg("queue"),
       py::arg("mem_objects"),
-      py::arg("wait_for").none(true)=py::none()
+      py::arg("wait_for").none()=py::none()
       );
 
 #if defined(cl_khr_gl_sharing) && (cl_khr_gl_sharing >= 1)
   m.def("get_gl_context_info_khr", get_gl_context_info_khr,
       py::arg("properties"),
       py::arg("param_name"),
-      py::arg("platform").none(true)=py::none()
+      py::arg("platform").none()=py::none()
       );
 #endif
 
diff --git a/src/wrap_mempool.cpp b/src/wrap_mempool.cpp
index d04aa5dad..34240fdb5 100644
--- a/src/wrap_mempool.cpp
+++ b/src/wrap_mempool.cpp
@@ -702,7 +702,7 @@ void pyopencl_expose_mempool(py::module_ &m)
           /* py::kw_only(), */
           py::arg("alignment")=0,
           py::arg("flags")=CL_MEM_READ_WRITE,
-          py::arg("queue").none(true)=nullptr
+          py::arg("queue").none()=nullptr
           )
       .def("__call__", pyopencl::svm_allocator_call, py::arg("size"))
       ;