diff --git a/docs/conf.py b/docs/conf.py
index 199db8df..52e9fe3b 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -77,8 +77,6 @@ def create_constraints_inventory() -> None:
     "qrules.topology.NodeType": "typing.TypeVar",
     "SpinFormalism": ("obj", "qrules.transition.SpinFormalism"),
     "StateDefinition": ("obj", "qrules.combinatorics.StateDefinition"),
-    "TypeAlias": "typing.TypeAlias",
-    "typing_extensions.TypeAlias": "typing.TypeAlias",
 }
 api_target_types: dict[str, str | tuple[str, str]] = {
     "qrules.combinatorics.InitialFacts": "obj",
@@ -109,7 +107,6 @@ def create_constraints_inventory() -> None:
     "qrules.solving.GraphElementProperties": "obj",
     "qrules.solving.GraphSettings": "obj",
     "qrules.transition.StateTransition": "obj",
-    "typing.TypeAlias": "obj",
 }
 author = "Common Partial Wave Analysis"
 autodoc_default_options = {
diff --git a/pyproject.toml b/pyproject.toml
index c85dff69..6208ca13 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,7 +33,7 @@ dependencies = [
     "particle",
     "python-constraint",
     "tqdm >=4.24.0", # autonotebook
-    'typing-extensions; python_version <"3.10.0"', # Literal, Protocol, TypeAlias
+    'typing-extensions; python_version <"3.8.0"', # Literal, Protocol
 ]
 description = "Rule-based particle reaction problem solver on a quantum number level"
 dynamic = ["version"]
diff --git a/src/qrules/combinatorics.py b/src/qrules/combinatorics.py
index e0f2a77c..8d79c49b 100644
--- a/src/qrules/combinatorics.py
+++ b/src/qrules/combinatorics.py
@@ -8,7 +8,6 @@
 from __future__ import annotations
 
 import itertools
-import sys
 from collections import OrderedDict
 from copy import deepcopy
 from typing import (
@@ -22,21 +21,18 @@
     Union,
 )
 
+from qrules.particle import ParticleWithSpin
 from qrules.quantum_numbers import InteractionProperties, arange
 from qrules.topology import MutableTransition, Topology, get_originating_node_list
 
 if TYPE_CHECKING:
-    from qrules.particle import ParticleCollection, ParticleWithSpin
+    from qrules.particle import ParticleCollection
 
-if sys.version_info >= (3, 10):
-    from typing import TypeAlias
-else:
-    from typing_extensions import TypeAlias
 
 StateWithSpins = Tuple[str, Sequence[float]]
 StateDefinition = Union[str, StateWithSpins]
 """Particle name, optionally with a list of spin projections."""
-InitialFacts: TypeAlias = "MutableTransition[ParticleWithSpin, InteractionProperties]"
+InitialFacts = MutableTransition[ParticleWithSpin, InteractionProperties]
 """A `.Transition` with only initial and final state information."""
 
 
diff --git a/src/qrules/solving.py b/src/qrules/solving.py
index 3859fc9c..f42314a4 100644
--- a/src/qrules/solving.py
+++ b/src/qrules/solving.py
@@ -10,7 +10,6 @@
 
 import inspect
 import logging
-import sys
 from abc import ABC, abstractmethod
 from collections import defaultdict
 from copy import copy
@@ -37,11 +36,6 @@
 )
 from qrules.topology import MutableTransition, Topology
 
-if sys.version_info >= (3, 10):
-    from typing import TypeAlias
-else:
-    from typing_extensions import TypeAlias
-
 _LOGGER = logging.getLogger(__name__)
 
 
@@ -76,11 +70,9 @@ class NodeSettings:
     interaction_strength: float = 1.0
 
 
-GraphSettings: TypeAlias = "MutableTransition[EdgeSettings, NodeSettings]"
+GraphSettings = MutableTransition[EdgeSettings, NodeSettings]
 """(Mutable) mapping of settings on a `.Topology`."""
-GraphElementProperties: TypeAlias = (
-    "MutableTransition[GraphEdgePropertyMap, GraphNodePropertyMap]"
-)
+GraphElementProperties = MutableTransition[GraphEdgePropertyMap, GraphNodePropertyMap]
 """(Mutable) mapping of edge and node properties on a `.Topology`."""
 
 
@@ -103,9 +95,7 @@ def topology(self) -> Topology:
         return self.initial_facts.topology
 
 
-QuantumNumberSolution: TypeAlias = (
-    "MutableTransition[GraphEdgePropertyMap, GraphNodePropertyMap]"
-)
+QuantumNumberSolution = MutableTransition[GraphEdgePropertyMap, GraphNodePropertyMap]
 
 
 def _convert_violated_rules_to_names(
diff --git a/src/qrules/transition.py b/src/qrules/transition.py
index 9eca9f67..be1ec7cd 100644
--- a/src/qrules/transition.py
+++ b/src/qrules/transition.py
@@ -10,7 +10,7 @@
 from copy import copy, deepcopy
 from enum import Enum, auto
 from multiprocessing import Pool
-from typing import TYPE_CHECKING, Iterable, Sequence, overload
+from typing import Iterable, Literal, Sequence, overload
 
 import attrs
 from attrs import define, field, frozen
@@ -68,6 +68,7 @@
 )
 from qrules.topology import (
     FrozenDict,
+    FrozenTransition,
     MutableTransition,
     Topology,
     create_isobar_topologies,
@@ -79,12 +80,6 @@
 else:
     from typing_extensions import Literal
 
-if sys.version_info >= (3, 10):
-    from typing import TypeAlias
-else:
-    from typing_extensions import TypeAlias
-if TYPE_CHECKING:
-    from qrules.topology import FrozenTransition
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -741,7 +736,7 @@ class State:
     spin_projection: float = field(converter=_to_float)
 
 
-StateTransition: TypeAlias = "FrozenTransition[State, InteractionProperties]"
+StateTransition = FrozenTransition[State, InteractionProperties]
 """Transition of some initial `.State` to a final `.State`."""