diff --git a/docs/conf.py b/docs/conf.py
index 25fffee7..e9ffff96 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -49,7 +49,7 @@ def pick_newtype_attrs(some_type: type) -> list:
 api_target_substitutions: dict[str, str | tuple[str, str]] = {
     "EdgeQuantumNumberTypes": ("obj", "qrules.quantum_numbers.EdgeQuantumNumberTypes"),
     "EdgeType": "typing.TypeVar",
-    "Fraction": "fraction.Fraction",
+    "Fraction": ("obj", "fractions.Fraction"),
     "GraphEdgePropertyMap": ("obj", "qrules.argument_handling.GraphEdgePropertyMap"),
     "GraphElementProperties": ("obj", "qrules.solving.GraphElementProperties"),
     "GraphNodePropertyMap": ("obj", "qrules.argument_handling.GraphNodePropertyMap"),
@@ -296,7 +296,6 @@ def pick_newtype_attrs(some_type: type) -> list:
     (r"py:(class|obj)", r"qrules\.topology\.NewNodeType"),
     (r"py:(class|obj)", r"qrules\.topology\.NodeType"),
     (r"py:(class|obj)", r"qrules\.topology\.VT"),
-    (r"py:(class|obj)", r"fraction\.Fraction"),
     *nitpick_temp_patterns,
 ]
 nitpicky = True
diff --git a/src/qrules/combinatorics.py b/src/qrules/combinatorics.py
index e8603981..fa29f6f1 100644
--- a/src/qrules/combinatorics.py
+++ b/src/qrules/combinatorics.py
@@ -233,8 +233,8 @@ def fill_spin_projections(state: StateDefinition) -> StateWithSpins:
             particle_name = state
             particle = particle_db[particle_name]
             spin_projections = set(arange(-particle.spin, particle.spin + 1))
-            if particle.mass == 0.0 and Fraction(0, 1) in spin_projections:
-                spin_projections.remove(Fraction(0, 1))
+            if particle.mass == 0.0 and Fraction(0) in spin_projections:
+                spin_projections.remove(Fraction(0))
             return particle_name, sorted(spin_projections)
         return state
 
diff --git a/src/qrules/conservation_rules.py b/src/qrules/conservation_rules.py
index 57d17c73..457f582c 100644
--- a/src/qrules/conservation_rules.py
+++ b/src/qrules/conservation_rules.py
@@ -855,7 +855,7 @@ def calculate_hypercharge(
         or edge_qns.tau_lepton_number
     ):
         return True
-    isospin_3 = Fraction(0, 1)
+    isospin_3 = Fraction(0)
     if edge_qns.isospin_projection:
         isospin_3 = edge_qns.isospin_projection
     return float(edge_qns.charge) == isospin_3 + 0.5 * calculate_hypercharge(edge_qns)
diff --git a/src/qrules/particle.py b/src/qrules/particle.py
index 8bea7e4e..8ac2b853 100644
--- a/src/qrules/particle.py
+++ b/src/qrules/particle.py
@@ -56,11 +56,11 @@ def _validate_fraction_for_spin(
     attribute: Attribute,  # noqa: ARG001
     value: Fraction,  # noqa: ARG001
 ) -> Any:
-    if instance.magnitude % Fraction(1, 2) != Fraction(0, 1):
+    if instance.magnitude % Fraction(1, 2) != Fraction(0):
         msg = f"Spin magnitude {instance.magnitude} has to be a multitude of 0.5"
         raise ValueError(msg)
     if abs(instance.projection) > instance.magnitude:
-        if instance.magnitude < Fraction(0, 1):
+        if instance.magnitude < Fraction(0):
             msg = f"Spin magnitude has to be positive, but is {instance.magnitude}"
             raise ValueError(msg)
         msg = (
diff --git a/src/qrules/quantum_numbers.py b/src/qrules/quantum_numbers.py
index 9e6d3163..cdf124fb 100644
--- a/src/qrules/quantum_numbers.py
+++ b/src/qrules/quantum_numbers.py
@@ -234,7 +234,7 @@ class InteractionProperties:
 
 
 def arange(
-    x_1: Fraction, x_2: Fraction, delta: Fraction = Fraction(1, 1)
+    x_1: Fraction, x_2: Fraction, delta: Fraction = Fraction(1)
 ) -> Generator[Fraction, None, None]:
     current = Fraction(x_1)
     delta = Fraction(delta)