diff --git a/pint/compat.py b/pint/compat.py
index 29fd00285..c379e7222 100644
--- a/pint/compat.py
+++ b/pint/compat.py
@@ -99,7 +99,7 @@ class BehaviorChangeWarning(UserWarning):
     else:
         NUMERIC_TYPES = (Number, Decimal, ndarray, np.number)
 
-    def _to_magnitude(value, force_ndarray=False, force_ndarray_like=False):
+    def _to_magnitude(value, force_ndarray: bool=False, force_ndarray_like: bool=False):
         if isinstance(value, (dict, bool)) or value is None:
             raise TypeError(f"Invalid magnitude for Quantity: {value!r}")
         elif isinstance(value, str) and value == "":
@@ -149,7 +149,7 @@ class np_datetime64:
     HAS_NUMPY_ARRAY_FUNCTION = False
     NP_NO_VALUE = None
 
-    def _to_magnitude(value, force_ndarray=False, force_ndarray_like=False):
+    def _to_magnitude(value, force_ndarray: bool=False, force_ndarray_like: bool=False):
         if force_ndarray or force_ndarray_like:
             raise ValueError(
                 "Cannot force to ndarray or ndarray-like when NumPy is not present."
diff --git a/pint/facets/measurement/objects.py b/pint/facets/measurement/objects.py
index 99c0794e8..33728f1c3 100644
--- a/pint/facets/measurement/objects.py
+++ b/pint/facets/measurement/objects.py
@@ -20,7 +20,7 @@
 
 class MeasurementQuantity(Generic[MagnitudeT], PlainQuantity[MagnitudeT]):
     # Measurement support
-    def plus_minus(self, error, relative=False):
+    def plus_minus(self, error, relative: bool=False):
         if isinstance(error, self.__class__):
             if relative:
                 raise ValueError(f"{error} is not a valid relative error.")
diff --git a/pint/facets/numpy/numpy_func.py b/pint/facets/numpy/numpy_func.py
index fd27c5e1c..6a4683cc3 100644
--- a/pint/facets/numpy/numpy_func.py
+++ b/pint/facets/numpy/numpy_func.py
@@ -597,7 +597,7 @@ def _unwrap(p, discont=None, axis=-1):
 
 
 @implements("copyto", "function")
-def _copyto(dst, src, casting="same_kind", where=True) -> None:
+def _copyto(dst, src, casting="same_kind", where: bool=True) -> None:
     if _is_quantity(dst):
         if _is_quantity(src):
             src = src.m_as(dst.units)
@@ -619,7 +619,7 @@ def _einsum(subscripts, *operands, **kwargs):
 
 
 @implements("isin", "function")
-def _isin(element, test_elements, assume_unique=False, invert=False):
+def _isin(element, test_elements, assume_unique: bool=False, invert: bool=False):
     if not _is_quantity(element):
         raise ValueError(
             "Cannot test if unit-aware elements are in not-unit-aware array"
@@ -815,7 +815,7 @@ def implementation(a, b, **kwargs):
 # Implement simple matching-unit or stripped-unit functions based on signature
 
 
-def implement_consistent_units_by_argument(func_str, unit_arguments, wrap_output=True) -> None:
+def implement_consistent_units_by_argument(func_str, unit_arguments, wrap_output: bool=True) -> None:
     # If NumPy is not available, do not attempt implement that which does not exist
     if np is None:
         return
diff --git a/pint/facets/plain/unit.py b/pint/facets/plain/unit.py
index 0ee05abbc..242fdf31d 100644
--- a/pint/facets/plain/unit.py
+++ b/pint/facets/plain/unit.py
@@ -241,7 +241,7 @@ def systems(self):
                     out.add(sname)
         return frozenset(out)
 
-    def from_(self, value, strict=True, name="value"):
+    def from_(self, value, strict: bool=True, name="value"):
         """Converts a numerical value or quantity to this unit
 
         Parameters
@@ -268,7 +268,7 @@ def from_(self, value, strict=True, name="value"):
         else:
             return value * self
 
-    def m_from(self, value, strict=True, name="value"):
+    def m_from(self, value, strict: bool=True, name="value"):
         """Converts a numerical value or quantity to this unit, then returns
         the magnitude of the converted value
 
diff --git a/pint/registry.py b/pint/registry.py
index 913a790f7..df091291e 100644
--- a/pint/registry.py
+++ b/pint/registry.py
@@ -120,8 +120,8 @@ def __init__(
         autoconvert_offset_to_baseunit: bool = False,
         on_redefinition: str = "warn",
         system=None,
-        auto_reduce_dimensions=False,
-        autoconvert_to_preferred=False,
+        auto_reduce_dimensions: bool=False,
+        autoconvert_to_preferred: bool=False,
         preprocessors=None,
         fmt_locale=None,
         non_int_type=float,