diff --git a/mpcpy/optimization.py b/mpcpy/optimization.py
index 503c5c4..56fa70f 100755
--- a/mpcpy/optimization.py
+++ b/mpcpy/optimization.py
@@ -602,14 +602,23 @@ def _simulate_initial(self, Optimization):
         
         '''
 
-        # Set Exogenous
+        # Update exogenous except constraints
         self.weather_data = self.Model.weather_data;
         self.internal_data = self.Model.internal_data;
         self.control_data = self.Model.control_data;
+        # Update constraints
         if type(Optimization._problem_type) is _ParameterEstimate:
             self.other_inputs = self.Model.other_inputs;
             self.opt_input_names = self._init_input_names;
-            # Otherwise inputs set by write control mop
+        else:
+            for key in Optimization.constraint_data.keys():
+                for field in Optimization.constraint_data[key]:     
+                    if field != 'Cyclic' and field != 'Final' and field != 'Initial':
+                        key_new = key.replace('.', '_') + '_' + field;
+                        if key_new not in self.other_inputs.keys():
+                            raise ValueError ('New constraint {0} found. The optimization problem needs to be re-instantiated to use this constraint.'.format(key_new))
+                        else:
+                            self.other_inputs[key_new] = Optimization.constraint_data[key][field];
         # Set parameters
         self.parameter_data = {};
         for key in self.Model.parameter_data.keys():
diff --git a/unittests/references/test_optimization/OptimizeSimpleFromJModelica/optimize_control_default_updated_constraints.csv b/unittests/references/test_optimization/OptimizeSimpleFromJModelica/optimize_control_default_updated_constraints.csv
new file mode 100644
index 0000000..15da7b7
--- /dev/null
+++ b/unittests/references/test_optimization/OptimizeSimpleFromJModelica/optimize_control_default_updated_constraints.csv
@@ -0,0 +1,146 @@
+Time,q_flow
+2017-01-11 00:00:00+00:00,2.2672949739899195e-06
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diff --git a/unittests/references/test_optimization/OptimizeSimpleFromJModelica/optimize_measurements_updated_constraints.csv b/unittests/references/test_optimization/OptimizeSimpleFromJModelica/optimize_measurements_updated_constraints.csv
new file mode 100644
index 0000000..6edf626
--- /dev/null
+++ b/unittests/references/test_optimization/OptimizeSimpleFromJModelica/optimize_measurements_updated_constraints.csv
@@ -0,0 +1,146 @@
+Time,T_db,q_flow
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diff --git a/unittests/resources/model/SimpleRC_Input.csv b/unittests/resources/model/SimpleRC_Input.csv
index d27ad8b..6c38e70 100644
--- a/unittests/resources/model/SimpleRC_Input.csv
+++ b/unittests/resources/model/SimpleRC_Input.csv
@@ -11,3 +11,5 @@ Time,q_flow_csv
 01/08/17,100
 01/09/17,100
 01/10/17,100
+01/11/17,100
+01/12/17,100
diff --git a/unittests/resources/optimization/SimpleRC_Constraints.csv b/unittests/resources/optimization/SimpleRC_Constraints.csv
index 2e65666..c3fe81d 100644
--- a/unittests/resources/optimization/SimpleRC_Constraints.csv
+++ b/unittests/resources/optimization/SimpleRC_Constraints.csv
@@ -11,3 +11,5 @@ Time,q_flow_min,T_db_min,T_db_max
 01/08/17,0,293,298
 01/09/17,0,293,298
 01/10/17,0,293,298
+01/11/17,0,290,300
+01/12/17,0,290,300
diff --git a/unittests/test_optimization.py b/unittests/test_optimization.py
index 3a45294..93544de 100755
--- a/unittests/test_optimization.py
+++ b/unittests/test_optimization.py
@@ -402,6 +402,50 @@ def test_optimize_long(self):
         df_test.index.name = 'Time'
         self.check_df(df_test, 'optimize_long_control.csv');
         
+    def test_update_constraints(self):
+        '''Test the updating of constraints in the optimization.
+        
+        '''
+        
+        modelpath = 'Simple.RC';        
+        # Instantiate model
+        model = models.Modelica(models.JModelica, \
+                                models.RMSE, \
+                                self.measurements, \
+                                moinfo = (self.mopath, modelpath, {}), \
+                                control_data = self.controls.data);
+        # Instantiate optimization problem
+        opt_problem = optimization.Optimization(model, \
+                                                optimization.EnergyMin, \
+                                                optimization.JModelica, \
+                                                'q_flow', \
+                                                constraint_data = self.constraints.data);                              
+        # Solve optimization problem with default constraints                   
+        opt_problem.optimize(self.start_time, self.final_time);
+        # Check references
+        df_test = opt_problem.display_measurements('Simulated');
+        self.check_df(df_test, 'optimize_measurements.csv');
+        df_test = model.control_data['q_flow'].display_data().to_frame();
+        df_test.index.name = 'Time'
+        self.check_df(df_test, 'optimize_control_default.csv');
+        # Update constraints and control data
+        self.constraints.collect_data('1/11/2017', '1/12/2017');
+        opt_problem.constraint_data = self.constraints.data;
+        self.controls.collect_data('1/11/2017', '1/12/2017');
+        # Solve optimization problem with updated constraints
+        opt_problem.optimize('1/11/2017', '1/12/2017');
+        # Check references
+        df_test = opt_problem.display_measurements('Simulated');
+        self.check_df(df_test, 'optimize_measurements_updated_constraints.csv');
+        df_test = model.control_data['q_flow'].display_data().to_frame();
+        df_test.index.name = 'Time'
+        self.check_df(df_test, 'optimize_control_default_updated_constraints.csv');
+        # Check new constraint key raises error
+        self.constraints.data['New_Constraint'] = opt_problem.constraint_data['q_flow']
+        opt_problem.constraint_data = self.constraints.data
+        with self.assertRaises(ValueError):
+            opt_problem.optimize('1/11/2017', '1/12/2017');
+        
 #%% Temperature tests
 class OptimizeAdvancedFromJModelica(TestCaseMPCPy):
     '''Tests for the optimization of a model using JModelica.