diff --git a/mapytex/calculus/API/tokens/polynomial.py b/mapytex/calculus/API/tokens/polynomial.py
index 020e47f..30a75de 100644
--- a/mapytex/calculus/API/tokens/polynomial.py
+++ b/mapytex/calculus/API/tokens/polynomial.py
@@ -55,11 +55,11 @@ class Polynomial(Token):
 
     @classmethod
     def random(cls):
-        raise NotImplemented
+        raise NotImplementedError
 
     def __setitem__(self, key, item):
         """ Use Polynomial like if they were a dictionnary to set coefficients """
-        raise NotImplemented("Can't set coefficient of a polynomial")
+        raise NotImplementedError("Can't set coefficient of a polynomial")
 
     def __getitem__(self, key):
         """ Use Polynomial like if they were a dictionnary to get coefficients 
@@ -104,7 +104,7 @@ class Polynomial(Token):
     @property
     def roots(self):
         """ Get roots of the Polynomial """
-        raise NotImplemented("Can't compute roots not specific polynomial")
+        raise NotImplementedError("Can't compute roots not specific polynomial")
 
 
 class Linear(Polynomial):
@@ -142,7 +142,7 @@ class Linear(Polynomial):
 
     @classmethod
     def random(cls):
-        raise NotImplemented
+        raise NotImplementedError
 
     @property
     def a(self):
@@ -213,7 +213,7 @@ class Quadratic(Polynomial):
 
     @classmethod
     def random(cls):
-        raise NotImplemented
+        raise NotImplementedError
 
     @property
     def a(self):
@@ -238,7 +238,7 @@ class Quadratic(Polynomial):
         elif self.delta._mo == 0:
             return [Expression.from_str(f"-{self.b}/(2*{self.a})").simplify()]
         else:
-            raise NotImplemented("Todo!")
+            raise NotImplementedError("Todo!")