diff --git a/core/embed/upymod/modtrezorutils/modtrezorutils.c b/core/embed/upymod/modtrezorutils/modtrezorutils.c
index 82bf6b7b6f..3edf17af84 100644
--- a/core/embed/upymod/modtrezorutils/modtrezorutils.c
+++ b/core/embed/upymod/modtrezorutils/modtrezorutils.c
@@ -254,6 +254,26 @@ STATIC mp_obj_t mod_trezorutils_sd_hotswap_enabled(void) {
 STATIC MP_DEFINE_CONST_FUN_OBJ_0(mod_trezorutils_sd_hotswap_enabled_obj,
                                  mod_trezorutils_sd_hotswap_enabled);
 
+/// def presize_module(mod: module, n: int):
+///     """
+///     Ensure the module's dict is preallocated to an expected size.
+///
+///     This is used in modules like `trezor`, whose dict size depends not only
+///     on the symbols defined in the file itself, but also on the number of
+///     submodules that will be inserted into the module's namespace.
+///     """
+STATIC mp_obj_t mod_trezorutils_presize_module(mp_obj_t mod, mp_obj_t n) {
+  if (!mp_obj_is_type(mod, &mp_type_module)) {
+    mp_raise_TypeError("expected module type");
+  }
+  mp_uint_t size = trezor_obj_get_uint(n);
+  mp_obj_dict_t *globals = mp_obj_module_get_globals(mod);
+  mp_obj_dict_presize(globals, size);
+  return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_trezorutils_presize_module_obj,
+                                 mod_trezorutils_presize_module);
+
 #if !PYOPT
 #if LOG_STACK_USAGE
 /// def zero_unused_stack() -> None:
@@ -601,6 +621,8 @@ STATIC const mp_rom_map_elem_t mp_module_trezorutils_globals_table[] = {
 #endif
     {MP_ROM_QSTR(MP_QSTR_sd_hotswap_enabled),
      MP_ROM_PTR(&mod_trezorutils_sd_hotswap_enabled_obj)},
+    {MP_ROM_QSTR(MP_QSTR_presize_module),
+     MP_ROM_PTR(&mod_trezorutils_presize_module_obj)},
     // various built-in constants
     {MP_ROM_QSTR(MP_QSTR_SCM_REVISION),
      MP_ROM_PTR(&mod_trezorutils_revision_obj)},
diff --git a/core/embed/upymod/qstrdefsport.h b/core/embed/upymod/qstrdefsport.h
index 23980524c5..55ff95f900 100644
--- a/core/embed/upymod/qstrdefsport.h
+++ b/core/embed/upymod/qstrdefsport.h
@@ -798,38 +798,6 @@ Q(Y)
 Q(z)
 Q(Z)
 
-// generate module presizing identifiers
-Q(___PRESIZE_MODULE_0)
-Q(___PRESIZE_MODULE_1)
-Q(___PRESIZE_MODULE_2)
-Q(___PRESIZE_MODULE_3)
-Q(___PRESIZE_MODULE_4)
-Q(___PRESIZE_MODULE_5)
-Q(___PRESIZE_MODULE_6)
-Q(___PRESIZE_MODULE_7)
-Q(___PRESIZE_MODULE_8)
-Q(___PRESIZE_MODULE_9)
-Q(___PRESIZE_MODULE_10)
-Q(___PRESIZE_MODULE_11)
-Q(___PRESIZE_MODULE_12)
-Q(___PRESIZE_MODULE_13)
-Q(___PRESIZE_MODULE_14)
-Q(___PRESIZE_MODULE_15)
-Q(___PRESIZE_MODULE_16)
-Q(___PRESIZE_MODULE_17)
-Q(___PRESIZE_MODULE_18)
-Q(___PRESIZE_MODULE_19)
-Q(___PRESIZE_MODULE_20)
-Q(___PRESIZE_MODULE_21)
-Q(___PRESIZE_MODULE_22)
-Q(___PRESIZE_MODULE_23)
-Q(___PRESIZE_MODULE_24)
-Q(___PRESIZE_MODULE_25)
-Q(___PRESIZE_MODULE_26)
-Q(___PRESIZE_MODULE_27)
-Q(___PRESIZE_MODULE_28)
-Q(___PRESIZE_MODULE_29)
-
 Q())
 Q(()
 Q(<)
diff --git a/core/embed/upymod/qstrdefsport.h.mako b/core/embed/upymod/qstrdefsport.h.mako
index 1ba066c426..e12bafa9d6 100644
--- a/core/embed/upymod/qstrdefsport.h.mako
+++ b/core/embed/upymod/qstrdefsport.h.mako
@@ -108,11 +108,6 @@ Q(${letter})
 Q(${letter.upper()})
 % endfor
 
-// generate module presizing identifiers
-% for i in range(30):
-Q(___PRESIZE_MODULE_${i})
-% endfor
-
 Q())
 Q(()
 Q(<)
diff --git a/core/mocks/generated/trezorutils.pyi b/core/mocks/generated/trezorutils.pyi
index 7da33c4078..a023f2e07c 100644
--- a/core/mocks/generated/trezorutils.pyi
+++ b/core/mocks/generated/trezorutils.pyi
@@ -87,6 +87,17 @@ def sd_hotswap_enabled() -> bool:
     """
 
 
+# upymod/modtrezorutils/modtrezorutils.c
+def presize_module(mod: module, n: int):
+    """
+    Ensure the module's dict is preallocated to an expected size.
+
+    This is used in modules like `trezor`, whose dict size depends not only
+    on the symbols defined in the file itself, but also on the number of
+    submodules that will be inserted into the module's namespace.
+    """
+
+
 # upymod/modtrezorutils/modtrezorutils.c
 def zero_unused_stack() -> None:
     """
diff --git a/core/src/main.py b/core/src/main.py
index e70aab913f..5c33ef32e6 100644
--- a/core/src/main.py
+++ b/core/src/main.py
@@ -11,13 +11,13 @@ import trezor
 # trezor.utils import only C modules
 from trezor import utils
 # we need space for 30 items in the trezor module
-utils.presize_module("trezor", 30)
+utils.presize_module(trezor, 30)
 
 # storage imports storage.common, storage.cache and storage.device.
 # These import trezor, trezor.config (which is a C module), trezor.utils, and each other.
 import storage
 # we will need space for 12 items in the storage module
-utils.presize_module("storage", 12)
+utils.presize_module(storage, 12)
 
 if not utils.BITCOIN_ONLY:
     # storage.fido2 only imports C modules
diff --git a/core/src/trezor/utils.py b/core/src/trezor/utils.py
index 7571702031..c4953166f1 100644
--- a/core/src/trezor/utils.py
+++ b/core/src/trezor/utils.py
@@ -28,6 +28,7 @@ from trezorutils import (  # noqa: F401
     firmware_vendor,
     halt,
     memcpy,
+    presize_module,
     reboot_to_bootloader,
     sd_hotswap_enabled,
     unit_btconly,
@@ -114,20 +115,6 @@ class unimport:
             self.free_heap = check_free_heap(self.free_heap)
 
 
-def presize_module(modname: str, size: int) -> None:
-    """Ensure the module's dict is preallocated to an expected size.
-
-    This is used in modules like `trezor`, whose dict size depends not only on the
-    symbols defined in the file itself, but also on the number of submodules that will
-    be inserted into the module's namespace.
-    """
-    module = sys.modules[modname]
-    for i in range(size):
-        setattr(module, f"___PRESIZE_MODULE_{i}", None)
-    for i in range(size):
-        delattr(module, f"___PRESIZE_MODULE_{i}")
-
-
 if __debug__:
     from ubinascii import hexlify
 
diff --git a/vendor/micropython b/vendor/micropython
index 476c569f35..b989de647c 160000
--- a/vendor/micropython
+++ b/vendor/micropython
@@ -1 +1 @@
-Subproject commit 476c569f3512f634b7f2e356d754bc17e5348d10
+Subproject commit b989de647c772e2bf8d604fdc47eb604f5a7ad50