diff --git a/code/ndarray.c b/code/ndarray.c
index 45418be2..1d60ef87 100644
--- a/code/ndarray.c
+++ b/code/ndarray.c
@@ -61,98 +61,6 @@ void ndarray_set_complex_value(void *p, size_t index, mp_obj_t value) {
     }
 }
 
-#ifdef CIRCUITPY
-void ndarray_set_value(char typecode, void *p, size_t index, mp_obj_t val_in) {
-    switch (typecode) {
-        case NDARRAY_INT8:
-            ((signed char *)p)[index] = mp_obj_get_int(val_in);
-            break;
-        case NDARRAY_UINT8:
-            ((unsigned char *)p)[index] = mp_obj_get_int(val_in);
-            break;
-        case NDARRAY_INT16:
-            ((short *)p)[index] = mp_obj_get_int(val_in);
-            break;
-        case NDARRAY_UINT16:
-            ((unsigned short *)p)[index] = mp_obj_get_int(val_in);
-            break;
-        case NDARRAY_FLOAT:
-            ((mp_float_t *)p)[index] = mp_obj_get_float(val_in);
-            break;
-        #if ULAB_SUPPORTS_COMPLEX
-        case NDARRAY_COMPLEX:
-            ndarray_set_complex_value(p, index, val_in);
-            break;
-        #endif
-    }
-}
-#endif
-
-#if defined(MICROPY_VERSION_MAJOR) && MICROPY_VERSION_MAJOR == 1 && MICROPY_VERSION_MINOR == 11
-
-void mp_obj_slice_indices(mp_obj_t self_in, mp_int_t length, mp_bound_slice_t *result) {
-    mp_obj_slice_t *self = MP_OBJ_TO_PTR(self_in);
-    mp_int_t start, stop, step;
-
-    if (self->step == mp_const_none) {
-        step = 1;
-    } else {
-        step = mp_obj_get_int(self->step);
-        if (step == 0) {
-            mp_raise_ValueError(translate("slice step can't be zero"));
-        }
-    }
-
-    if (step > 0) {
-        // Positive step
-        if (self->start == mp_const_none) {
-            start = 0;
-        } else {
-            start = mp_obj_get_int(self->start);
-            if (start < 0) {
-                start += length;
-            }
-            start = MIN(length, MAX(start, 0));
-        }
-
-        if (self->stop == mp_const_none) {
-            stop = length;
-        } else {
-            stop = mp_obj_get_int(self->stop);
-            if (stop < 0) {
-                stop += length;
-            }
-            stop = MIN(length, MAX(stop, 0));
-        }
-    } else {
-        // Negative step
-        if (self->start == mp_const_none) {
-            start = length - 1;
-        } else {
-            start = mp_obj_get_int(self->start);
-            if (start < 0) {
-                start += length;
-            }
-            start = MIN(length - 1, MAX(start, -1));
-        }
-
-        if (self->stop == mp_const_none) {
-            stop = -1;
-        } else {
-            stop = mp_obj_get_int(self->stop);
-            if (stop < 0) {
-                stop += length;
-            }
-            stop = MIN(length - 1, MAX(stop, -1));
-        }
-    }
-
-    result->start = start;
-    result->stop = stop;
-    result->step = step;
-}
-#endif /* MICROPY_VERSION v1.11 */
-
 void ndarray_fill_array_iterable(mp_float_t *array, mp_obj_t iterable) {
     mp_obj_iter_buf_t x_buf;
     mp_obj_t x_item, x_iterable = mp_getiter(iterable, &x_buf);
diff --git a/code/ndarray.h b/code/ndarray.h
index 4564f772..3025c051 100644
--- a/code/ndarray.h
+++ b/code/ndarray.h
@@ -113,11 +113,9 @@ typedef struct _mp_obj_slice_t {
 
 #if !CIRCUITPY
 #define translate(x) MP_ERROR_TEXT(x)
-#define ndarray_set_value(a, b, c, d) mp_binary_set_val_array(a, b, c, d)
-#else
-void ndarray_set_value(char , void *, size_t , mp_obj_t );
 #endif
 
+#define ndarray_set_value(a, b, c, d) mp_binary_set_val_array(a, b, c, d)
 void ndarray_set_complex_value(void *, size_t , mp_obj_t );
 
 #define NDARRAY_NUMERIC   0
diff --git a/code/ndarray_properties.c b/code/ndarray_properties.c
index 547b1912..aa297158 100644
--- a/code/ndarray_properties.c
+++ b/code/ndarray_properties.c
@@ -24,29 +24,6 @@
 #include "numpy/carray/carray.h"
 #endif
 
-#ifndef CIRCUITPY
-
-// a somewhat hackish implementation of property getters/setters;
-// this functions is hooked into the attr member of ndarray
-
-STATIC void call_local_method(mp_obj_t obj, qstr attr, mp_obj_t *dest) {
-    const mp_obj_type_t *type = mp_obj_get_type(obj);
-    while (MP_OBJ_TYPE_HAS_SLOT(type, locals_dict)) {
-        assert(MP_OBJ_TYPE_GET_SLOT(type, locals_dict)->base.type == &mp_type_dict); // MicroPython restriction, for now
-        mp_map_t *locals_map = &MP_OBJ_TYPE_GET_SLOT(type, locals_dict)->map;
-        mp_map_elem_t *elem = mp_map_lookup(locals_map, MP_OBJ_NEW_QSTR(attr), MP_MAP_LOOKUP);
-        if (elem != NULL) {
-            mp_convert_member_lookup(obj, type, elem->value, dest);
-            break;
-        }
-        if (!MP_OBJ_TYPE_HAS_SLOT(type, parent)) {
-            break;
-        }
-        type = MP_OBJ_TYPE_GET_SLOT(type, parent);
-    }
-}
-
-
 void ndarray_properties_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
     if (dest[0] == MP_OBJ_NULL) {
         switch(attr) {
@@ -98,7 +75,8 @@ void ndarray_properties_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
             #endif
             #endif /* ULAB_SUPPORTS_COMPLEX */
             default:
-                call_local_method(self_in, attr, dest);
+                // forward to locals dict
+                dest[1] = MP_OBJ_SENTINEL;
                 break;
         }
     } else {
@@ -119,5 +97,3 @@ void ndarray_properties_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
         }
     }
 }
-
-#endif /* CIRCUITPY */
diff --git a/code/ndarray_properties.h b/code/ndarray_properties.h
index a074ec1f..3e0b9a40 100644
--- a/code/ndarray_properties.h
+++ b/code/ndarray_properties.h
@@ -22,74 +22,6 @@
 #include "ndarray.h"
 #include "numpy/ndarray/ndarray_iter.h"
 
-#if CIRCUITPY
-typedef struct _mp_obj_property_t {
-    mp_obj_base_t base;
-    mp_obj_t proxy[3]; // getter, setter, deleter
-} mp_obj_property_t;
-
-#if NDARRAY_HAS_DTYPE
-MP_DEFINE_CONST_FUN_OBJ_1(ndarray_get_dtype_obj, ndarray_dtype);
-STATIC const mp_obj_property_t ndarray_dtype_obj = {
-    .base.type = &mp_type_property,
-    .proxy = {(mp_obj_t)&ndarray_get_dtype_obj,
-              mp_const_none,
-              mp_const_none },
-};
-#endif /* NDARRAY_HAS_DTYPE */
-
-#if NDARRAY_HAS_FLATITER
-MP_DEFINE_CONST_FUN_OBJ_1(ndarray_flatiter_make_new_obj, ndarray_flatiter_make_new);
-STATIC const mp_obj_property_t ndarray_flat_obj = {
-    .base.type = &mp_type_property,
-    .proxy = {(mp_obj_t)&ndarray_flatiter_make_new_obj,
-              mp_const_none,
-              mp_const_none },
-};
-#endif /* NDARRAY_HAS_FLATITER */
-
-#if NDARRAY_HAS_ITEMSIZE
-MP_DEFINE_CONST_FUN_OBJ_1(ndarray_get_itemsize_obj, ndarray_itemsize);
-STATIC const mp_obj_property_t ndarray_itemsize_obj = {
-    .base.type = &mp_type_property,
-    .proxy = {(mp_obj_t)&ndarray_get_itemsize_obj,
-              mp_const_none,
-              mp_const_none },
-};
-#endif /* NDARRAY_HAS_ITEMSIZE */
-
-#if NDARRAY_HAS_SHAPE
-MP_DEFINE_CONST_FUN_OBJ_1(ndarray_get_shape_obj, ndarray_shape);
-STATIC const mp_obj_property_t ndarray_shape_obj = {
-    .base.type = &mp_type_property,
-    .proxy = {(mp_obj_t)&ndarray_get_shape_obj,
-              mp_const_none,
-              mp_const_none },
-};
-#endif /* NDARRAY_HAS_SHAPE */
-
-#if NDARRAY_HAS_SIZE
-MP_DEFINE_CONST_FUN_OBJ_1(ndarray_get_size_obj, ndarray_size);
-STATIC const mp_obj_property_t ndarray_size_obj = {
-    .base.type = &mp_type_property,
-    .proxy = {(mp_obj_t)&ndarray_get_size_obj,
-              mp_const_none,
-              mp_const_none },
-};
-#endif /* NDARRAY_HAS_SIZE */
-
-#if NDARRAY_HAS_STRIDES
-MP_DEFINE_CONST_FUN_OBJ_1(ndarray_get_strides_obj, ndarray_strides);
-STATIC const mp_obj_property_t ndarray_strides_obj = {
-    .base.type = &mp_type_property,
-    .proxy = {(mp_obj_t)&ndarray_get_strides_obj,
-              mp_const_none,
-              mp_const_none },
-};
-#endif /* NDARRAY_HAS_STRIDES */
-
-#else
-
 void ndarray_properties_attr(mp_obj_t , qstr , mp_obj_t *);
 
 #if NDARRAY_HAS_DTYPE
@@ -116,6 +48,4 @@ MP_DEFINE_CONST_FUN_OBJ_1(ndarray_size_obj, ndarray_size);
 MP_DEFINE_CONST_FUN_OBJ_1(ndarray_strides_obj, ndarray_strides);
 #endif
 
-#endif /* CIRCUITPY */
-
 #endif
diff --git a/code/numpy/fft/fft.c b/code/numpy/fft/fft.c
index ad4996e3..42621f52 100644
--- a/code/numpy/fft/fft.c
+++ b/code/numpy/fft/fft.c
@@ -101,9 +101,5 @@ const mp_obj_module_t ulab_fft_module = {
     .globals = (mp_obj_dict_t*)&mp_module_ulab_fft_globals,
 };
 #if CIRCUITPY_ULAB
-#if !defined(MICROPY_VERSION) || MICROPY_VERSION <= 70144
-MP_REGISTER_MODULE(MP_QSTR_ulab_dot_numpy_dot_fft, ulab_fft_module, MODULE_ULAB_ENABLED);
-#else
 MP_REGISTER_MODULE(MP_QSTR_ulab_dot_numpy_dot_fft, ulab_fft_module);
 #endif
-#endif
diff --git a/code/numpy/linalg/linalg.c b/code/numpy/linalg/linalg.c
index 0243a5d9..55ac4752 100644
--- a/code/numpy/linalg/linalg.c
+++ b/code/numpy/linalg/linalg.c
@@ -537,10 +537,6 @@ const mp_obj_module_t ulab_linalg_module = {
     .globals = (mp_obj_dict_t*)&mp_module_ulab_linalg_globals,
 };
 #if CIRCUITPY_ULAB
-#if !defined(MICROPY_VERSION) || MICROPY_VERSION <= 70144
-MP_REGISTER_MODULE(MP_QSTR_ulab_dot_numpy_dot_linalg, ulab_linalg_module, MODULE_ULAB_ENABLED);
-#else
 MP_REGISTER_MODULE(MP_QSTR_ulab_dot_numpy_dot_linalg, ulab_linalg_module);
 #endif
 #endif
-#endif
diff --git a/code/numpy/numpy.c b/code/numpy/numpy.c
index d530638e..74de9088 100644
--- a/code/numpy/numpy.c
+++ b/code/numpy/numpy.c
@@ -397,9 +397,5 @@ const mp_obj_module_t ulab_numpy_module = {
 };
 
 #if CIRCUITPY_ULAB
-#if !defined(MICROPY_VERSION) || MICROPY_VERSION <= 70144
-MP_REGISTER_MODULE(MP_QSTR_ulab_dot_numpy, ulab_numpy_module, MODULE_ULAB_ENABLED);
-#else
 MP_REGISTER_MODULE(MP_QSTR_ulab_dot_numpy, ulab_numpy_module);
 #endif
-#endif
diff --git a/code/scipy/linalg/linalg.c b/code/scipy/linalg/linalg.c
index 52c04afe..a42392ce 100644
--- a/code/scipy/linalg/linalg.c
+++ b/code/scipy/linalg/linalg.c
@@ -276,10 +276,6 @@ const mp_obj_module_t ulab_scipy_linalg_module = {
     .globals = (mp_obj_dict_t*)&mp_module_ulab_scipy_linalg_globals,
 };
 #if CIRCUITPY_ULAB
-#if !defined(MICROPY_VERSION) || MICROPY_VERSION <= 70144
-MP_REGISTER_MODULE(MP_QSTR_ulab_dot_scipy_dot_linalg, ulab_scipy_linalg_module, MODULE_ULAB_ENABLED);
-#else
 MP_REGISTER_MODULE(MP_QSTR_ulab_dot_scipy_dot_linalg, ulab_scipy_linalg_module);
 #endif
 #endif
-#endif
diff --git a/code/scipy/optimize/optimize.c b/code/scipy/optimize/optimize.c
index 7fc6b670..ef10288d 100644
--- a/code/scipy/optimize/optimize.c
+++ b/code/scipy/optimize/optimize.c
@@ -413,9 +413,5 @@ const mp_obj_module_t ulab_scipy_optimize_module = {
     .globals = (mp_obj_dict_t*)&mp_module_ulab_scipy_optimize_globals,
 };
 #if CIRCUITPY_ULAB
-#if !defined(MICROPY_VERSION) || MICROPY_VERSION <= 70144
-MP_REGISTER_MODULE(MP_QSTR_ulab_dot_scipy_dot_optimize, ulab_scipy_optimize_module, MODULE_ULAB_ENABLED);
-#else
 MP_REGISTER_MODULE(MP_QSTR_ulab_dot_scipy_dot_optimize, ulab_scipy_optimize_module);
 #endif
-#endif
diff --git a/code/scipy/scipy.c b/code/scipy/scipy.c
index c9f51df5..6895127b 100644
--- a/code/scipy/scipy.c
+++ b/code/scipy/scipy.c
@@ -49,10 +49,6 @@ const mp_obj_module_t ulab_scipy_module = {
     .globals = (mp_obj_dict_t*)&mp_module_ulab_scipy_globals,
 };
 #if CIRCUITPY_ULAB
-#if !defined(MICROPY_VERSION) || MICROPY_VERSION <= 70144
-MP_REGISTER_MODULE(MP_QSTR_ulab_dot_scipy, ulab_scipy_module, MODULE_ULAB_ENABLED);
-#else
 MP_REGISTER_MODULE(MP_QSTR_ulab_dot_scipy, ulab_scipy_module);
 #endif
-#endif
 #endif /* ULAB_HAS_SCIPY */
diff --git a/code/scipy/signal/signal.c b/code/scipy/signal/signal.c
index 6afa05f6..db8d3cc5 100644
--- a/code/scipy/signal/signal.c
+++ b/code/scipy/signal/signal.c
@@ -134,9 +134,5 @@ const mp_obj_module_t ulab_scipy_signal_module = {
     .globals = (mp_obj_dict_t*)&mp_module_ulab_scipy_signal_globals,
 };
 #if CIRCUITPY_ULAB
-#if !defined(MICROPY_VERSION) || MICROPY_VERSION <= 70144
-MP_REGISTER_MODULE(MP_QSTR_ulab_dot_scipy_dot_signal, ulab_scipy_signal_module, MODULE_ULAB_ENABLED);
-#else
 MP_REGISTER_MODULE(MP_QSTR_ulab_dot_scipy_dot_signal, ulab_scipy_signal_module);
 #endif
-#endif
diff --git a/code/scipy/special/special.c b/code/scipy/special/special.c
index 9d5ca629..0e561b6f 100644
--- a/code/scipy/special/special.c
+++ b/code/scipy/special/special.c
@@ -41,9 +41,5 @@ const mp_obj_module_t ulab_scipy_special_module = {
     .globals = (mp_obj_dict_t*)&mp_module_ulab_scipy_special_globals,
 };
 #if CIRCUITPY_ULAB
-#if !defined(MICROPY_VERSION) || MICROPY_VERSION <= 70144
-MP_REGISTER_MODULE(MP_QSTR_ulab_dot_scipy_dot_special, ulab_scipy_special_module, MODULE_ULAB_ENABLED);
-#else
 MP_REGISTER_MODULE(MP_QSTR_ulab_dot_scipy_dot_special, ulab_scipy_special_module);
 #endif
-#endif
diff --git a/code/ulab.c b/code/ulab.c
index d731aac4..bb0f8758 100644
--- a/code/ulab.c
+++ b/code/ulab.c
@@ -76,26 +76,6 @@ STATIC const mp_rom_map_elem_t ulab_ndarray_locals_dict_table[] = {
     #if NDARRAY_HAS_SORT
         { MP_ROM_QSTR(MP_QSTR_sort), MP_ROM_PTR(&numerical_sort_inplace_obj) },
     #endif
-    #ifdef CIRCUITPY
-        #if NDARRAY_HAS_DTYPE
-            { MP_ROM_QSTR(MP_QSTR_dtype), MP_ROM_PTR(&ndarray_dtype_obj) },
-        #endif
-        #if NDARRAY_HAS_FLATITER
-            { MP_ROM_QSTR(MP_QSTR_flat), MP_ROM_PTR(&ndarray_flat_obj) },
-        #endif
-        #if NDARRAY_HAS_ITEMSIZE
-            { MP_ROM_QSTR(MP_QSTR_itemsize), MP_ROM_PTR(&ndarray_itemsize_obj) },
-        #endif
-        #if NDARRAY_HAS_SHAPE
-            { MP_ROM_QSTR(MP_QSTR_shape), MP_ROM_PTR(&ndarray_shape_obj) },
-        #endif
-        #if NDARRAY_HAS_SIZE
-            { MP_ROM_QSTR(MP_QSTR_size), MP_ROM_PTR(&ndarray_size_obj) },
-        #endif
-        #if NDARRAY_HAS_STRIDES
-            { MP_ROM_QSTR(MP_QSTR_strides), MP_ROM_PTR(&ndarray_strides_obj) },
-        #endif
-    #endif /* CIRCUITPY */
 };
 
 STATIC MP_DEFINE_CONST_DICT(ulab_ndarray_locals_dict, ulab_ndarray_locals_dict_table);
@@ -167,9 +147,7 @@ const mp_obj_type_t ulab_ndarray_type = {
     #if NDARRAY_HAS_BINARY_OPS
     .binary_op = ndarray_binary_op,
     #endif
-    #ifndef CIRCUITPY
     .attr = ndarray_properties_attr,
-    #endif
     .buffer_p = { .get_buffer = ndarray_get_buffer, },
     )
 };
@@ -253,10 +231,4 @@ const mp_obj_module_t ulab_user_cmodule = {
     .globals = (mp_obj_dict_t*)&mp_module_ulab_globals,
 };
 
-// Use old three-argument MP_REGISTER_MODULE for
-// MicroPython <= v1.18.0: (1 << 16) | (18 << 8) | 0
-#if !defined(MICROPY_VERSION) || MICROPY_VERSION <= 70144
-MP_REGISTER_MODULE(MP_QSTR_ulab, ulab_user_cmodule, MODULE_ULAB_ENABLED);
-#else
 MP_REGISTER_MODULE(MP_QSTR_ulab, ulab_user_cmodule);
-#endif
diff --git a/code/user/user.c b/code/user/user.c
index dfc3fcde..88775fda 100644
--- a/code/user/user.c
+++ b/code/user/user.c
@@ -92,11 +92,7 @@ const mp_obj_module_t ulab_user_module = {
     .globals = (mp_obj_dict_t*)&mp_module_ulab_user_globals,
 };
 #if CIRCUITPY_ULAB
-#if !defined(MICROPY_VERSION) || MICROPY_VERSION <= 70144
-MP_REGISTER_MODULE(MP_QSTR_ulab_dot_user, ulab_user_module, ULAB_HAS_USER_MODULE);
-#else
 MP_REGISTER_MODULE(MP_QSTR_ulab_dot_user, ulab_user_module);
 #endif
 #endif
 
-#endif
diff --git a/code/utils/utils.c b/code/utils/utils.c
index fee67d47..6a59baf3 100644
--- a/code/utils/utils.c
+++ b/code/utils/utils.c
@@ -250,11 +250,7 @@ const mp_obj_module_t ulab_utils_module = {
     .globals = (mp_obj_dict_t*)&mp_module_ulab_utils_globals,
 };
 #if CIRCUITPY_ULAB
-#if !defined(MICROPY_VERSION) || MICROPY_VERSION <= 70144
-MP_REGISTER_MODULE(MP_QSTR_ulab_dot_utils, ulab_utils_module, MODULE_ULAB_ENABLED);
-#else
 MP_REGISTER_MODULE(MP_QSTR_ulab_dot_utils, ulab_utils_module);
 #endif
-#endif
 
 #endif /* ULAB_HAS_UTILS_MODULE */