diff --git a/openfisca_core/parameters/helpers.py b/openfisca_core/parameters/helpers.py
index 75d5a18b73..c3f009cf7b 100644
--- a/openfisca_core/parameters/helpers.py
+++ b/openfisca_core/parameters/helpers.py
@@ -2,6 +2,7 @@
 import traceback
 
 import numpy
+import pandas as pd
 
 from openfisca_core import parameters, periods
 from openfisca_core.errors import ParameterParsingError
@@ -9,10 +10,16 @@
 
 
 def contains_nan(vector):
+    print(vector)
     if numpy.issubdtype(vector.dtype, numpy.record):
         return any([contains_nan(vector[name]) for name in vector.dtype.names])
     else:
         return numpy.isnan(vector).any()
+        #print(type(vector), type(vector[0]))
+        #vector = vector.astype(float)
+        #return pd.isna(vector).any()
+        #_vector = numpy.array(vector)
+        print(type(vector), vector)
 
 
 def load_parameter_file(file_path, name = ''):
diff --git a/openfisca_core/simulations/simulation.py b/openfisca_core/simulations/simulation.py
index ef1cbbd869..24163c07ba 100644
--- a/openfisca_core/simulations/simulation.py
+++ b/openfisca_core/simulations/simulation.py
@@ -96,7 +96,8 @@ def calculate(self, variable_name: str, period):
         """Calculate ``variable_name`` for ``period``."""
 
         if period is not None and not isinstance(period, Period):
-            period = periods.period(period)
+            ##period = periods.period(period)
+            period = Period(period)
 
         self.tracer.record_calculation_start(variable_name, period)
 
@@ -270,23 +271,14 @@ def _check_period_consistency(self, period, variable):
             return  # For variables which values are constant in time, all periods are accepted
 
         if variable.definition_period == periods.MONTH and period.unit != periods.MONTH:
-            raise ValueError("Unable to compute variable '{0}' for period {1}: '{0}' must be computed for a whole month. You can use the ADD option to sum '{0}' over the requested period, or change the requested period to 'period.first_month'.".format(
-                variable.name,
-                period
-                ))
+            raise ValueError(f"Unable to compute variable '{variable.name}' for period {period}: '{variable.name}' must be computed for a whole month. You can use the ADD option to sum '{variable.name}' over the requested period, or change the requested period to 'period.first_month'.")
 
         if variable.definition_period == periods.YEAR and period.unit != periods.YEAR:
-            raise ValueError("Unable to compute variable '{0}' for period {1}: '{0}' must be computed for a whole year. You can use the DIVIDE option to get an estimate of {0} by dividing the yearly value by 12, or change the requested period to 'period.this_year'.".format(
-                variable.name,
-                period
-                ))
+            raise ValueError(f"Unable to compute variable '{variable.name}' for period {period}: '{variable.name}' must be computed for a whole year. You can use the DIVIDE option to get an estimate of {variable.name} by dividing the yearly value by 12, or change the requested period to 'period.this_year'.")
 
         if period.size != 1:
-            raise ValueError("Unable to compute variable '{0}' for period {1}: '{0}' must be computed for a whole {2}. You can use the ADD option to sum '{0}' over the requested period.".format(
-                variable.name,
-                period,
-                'month' if variable.definition_period == periods.MONTH else 'year'
-                ))
+            _period = 'month' if variable.definition_period == periods.MONTH else 'year'
+            raise ValueError(f"Unable to compute variable '{variable.name}' for period {period}: '{variable.name}' must be computed for a whole {_period}. You can use the ADD option to sum '{variable.name}' over the requested period.")
 
     def _cast_formula_result(self, value, variable):
         if variable.value_type == Enum and not isinstance(value, EnumArray):
diff --git a/openfisca_core/types/_data.py b/openfisca_core/types/_data.py
index ff7066d43a..298566aece 100644
--- a/openfisca_core/types/_data.py
+++ b/openfisca_core/types/_data.py
@@ -1,12 +1,15 @@
 from typing import Sequence, TypeVar, Union
 
-from nptyping import types, NDArray as Array
+# Modified by Emanuele Cannizzaro on 03/06/2023
+#from typing import types, NDArray as Array
+import types
+from numpy import ndarray as Array
 
 import numpy
 
 T = TypeVar("T", bool, bytes, float, int, object, str)
 
-types._ndarray_meta._Type = Union[type, numpy.dtype, TypeVar]
+##types._ndarray_meta._Type = Union[type, numpy.dtype, TypeVar]
 
 ArrayLike = Union[Array[T], Sequence[T]]
 """:obj:`typing.Generic`: Type of any castable to :class:`numpy.ndarray`.
diff --git a/setup.py b/setup.py
index 1723a25aaf..ae686db05f 100644
--- a/setup.py
+++ b/setup.py
@@ -27,41 +27,41 @@
 
 general_requirements = [
     'PyYAML >= 3.10',
-    'dpath >= 1.5.0, < 3.0.0',
-    'importlib-metadata < 4.3.0',  # Required for Python 3.7 and Flake8
-    'nptyping == 1.4.4',
-    'numexpr >= 2.7.0, <= 3.0',
-    'numpy >= 1.11, < 1.21',
-    'psutil >= 5.4.7, < 6.0.0',
-    'pytest >= 4.4.1, < 6.0.0',  # For openfisca test
-    'sortedcontainers == 2.2.2',
-    'typing-extensions >= 4.0.0, < 5.0.0',
+    'dpath >= 1.5.0',
+    'importlib-metadata >= 4.3.0',  # Required for Python 3.7 and Flake8
+    'nptyping >= 1.4.4',
+    'numexpr >= 2.7.0',
+    'numpy >= 1.11',
+    'psutil >= 5.4.7',
+    'pytest >= 4.4.1',  # For openfisca test
+    'sortedcontainers >= 2.2.2',
+    'typing-extensions >= 4.0.0',
     ]
 
 api_requirements = [
-    'markupsafe == 2.0.1',  # While flask revision < 2
-    'flask == 1.1.4',
-    'flask-cors == 3.0.10',
-    'gunicorn >= 20.0.0, < 21.0.0',
-    'werkzeug >= 1.0.0, < 2.0.0',
+    'markupsafe >= 2.0.1',  # While flask revision < 2
+    'flask >= 1.1.4',
+    'flask-cors >= 3.0.10',
+    'gunicorn >= 20.0.0',
+    'werkzeug >= 1.0.0',
     ]
 
 dev_requirements = [
-    'autopep8 >= 1.4.0, < 1.6.0',
-    'coverage >= 6.0.2, < 7.0.0',
-    'darglint == 1.8.0',
-    'flake8 >= 4.0.0, < 4.1.0',
-    'flake8-bugbear >= 19.3.0, < 20.0.0',
-    'flake8-docstrings == 1.6.0',
-    'flake8-print >= 3.1.0, < 4.0.0',
-    'flake8-rst-docstrings == 0.2.3',
-    'idna >= 3.4.0, < 4.0.0',
-    'isort >= 5.0.0, < 6.0.0',
-    'mypy == 0.910',
-    'openapi-spec-validator >= 0.5.0, < 0.6.0',
-    'pycodestyle >= 2.8.0, < 2.9.0',
-    'pylint == 2.10.2',
-    'xdoctest >= 1.0.0, < 2.0.0',
+    'autopep8 >= 1.4.0',
+    'coverage >= 6.0.2',
+    'darglint >= 1.8.0',
+    'flake8 >= 4.0.0',
+    'flake8-bugbear >= 19.3.0',
+    'flake8-docstrings >= 1.6.0',
+    'flake8-print >= 3.1.0',
+    'flake8-rst-docstrings >= 0.2.3',
+    'idna >= 3.4.0',
+    'isort >= 5.0.0',
+    'mypy >= 0.910',
+    'openapi-spec-validator >= 0.5.0',
+    'pycodestyle >= 2.8.0',
+    'pylint >= 2.10.2',
+    'xdoctest >= 1.0.0',
     ] + api_requirements
 
 setup(