diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d0202331..9e3efc72 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: astral-sh/setup-uv@v7
         with:
-          python-version: 3.8
+          python-version: 3.9
       - uses: actions/setup-python@v6
       - run: uv sync --dev --all-packages
       - run: uv run python -m flake8
@@ -23,8 +23,8 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-22.04, windows-2022]
-        python-version: [3.8, 3.9, "3.10", 3.11, 3.12, pypy3.9, pypy3.10]
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        python-version: [3.9, "3.10", 3.11, 3.12, 3.13, 3.14]
     steps:
       - uses: actions/checkout@v6
       - uses: astral-sh/setup-uv@v7
@@ -48,8 +48,8 @@ jobs:
       - uses: actions/checkout@v6
       - uses: astral-sh/setup-uv@v7
         with:
-          python-version: 3.8
-      - run: uv venv --python 3.8
+          python-version: 3.9
+      - run: uv venv --python 3.9
       - run: uv pip install ${{ matrix.fluent-syntax }}
       - run: uv pip install ./fluent.runtime
       - run: uv run python -m unittest discover -s fluent.runtime
diff --git a/fluent.runtime/fluent/runtime/builtins.py b/fluent.runtime/fluent/runtime/builtins.py
index 02e817b8..6833c172 100644
--- a/fluent.runtime/fluent/runtime/builtins.py
+++ b/fluent.runtime/fluent/runtime/builtins.py
@@ -1,4 +1,4 @@
-from typing import Callable, Dict
+from typing import Callable
 
 from .types import FluentType, fluent_date, fluent_number
 
@@ -6,7 +6,7 @@
 DATETIME = fluent_date
 
 
-BUILTINS: Dict[str, Callable[..., FluentType]] = {
+BUILTINS: dict[str, Callable[..., FluentType]] = {
     "NUMBER": NUMBER,
     "DATETIME": DATETIME,
 }
diff --git a/fluent.runtime/fluent/runtime/bundle.py b/fluent.runtime/fluent/runtime/bundle.py
index a88fdab7..92db7d82 100644
--- a/fluent.runtime/fluent/runtime/bundle.py
+++ b/fluent.runtime/fluent/runtime/bundle.py
@@ -1,10 +1,9 @@
-from typing import TYPE_CHECKING, Any, Callable, Dict, List, Tuple, Union, cast
+from typing import TYPE_CHECKING, Any, Callable, Literal, Union, cast
 
 import babel
 import babel.numbers
 import babel.plural
 from fluent.syntax import ast as FTL
-from typing_extensions import Literal
 
 from .builtins import BUILTINS
 from .prepare import Compiler
@@ -34,16 +33,16 @@ class FluentBundle:
 
     def __init__(
         self,
-        locales: List[str],
-        functions: Union[Dict[str, Callable[..., "FluentType"]], None] = None,
+        locales: list[str],
+        functions: Union[dict[str, Callable[..., "FluentType"]], None] = None,
         use_isolating: bool = True,
     ):
         self.locales = locales
         self._functions = {**BUILTINS, **(functions or {})}
         self.use_isolating = use_isolating
-        self._messages: Dict[str, Union[FTL.Message, FTL.Term]] = {}
-        self._terms: Dict[str, Union[FTL.Message, FTL.Term]] = {}
-        self._compiled: Dict[str, Message] = {}
+        self._messages: dict[str, Union[FTL.Message, FTL.Term]] = {}
+        self._terms: dict[str, Union[FTL.Message, FTL.Term]] = {}
+        self._compiled: dict[str, Message] = {}
         # The compiler is not typed, and this cast is only valid for the public API
         self._compiler = cast(
             Callable[[Union[FTL.Message, FTL.Term]], Message], Compiler()
@@ -90,8 +89,8 @@ def _lookup(self, entry_id: str, term: bool = False) -> Message:
         return self._compiled[compiled_id]
 
     def format_pattern(
-        self, pattern: Pattern, args: Union[Dict[str, Any], None] = None
-    ) -> Tuple[Union[str, "FluentNone"], List[Exception]]:
+        self, pattern: Pattern, args: Union[dict[str, Any], None] = None
+    ) -> tuple[Union[str, "FluentNone"], list[Exception]]:
         if args is not None:
             fluent_args = {
                 argname: native_to_fluent(argvalue)
@@ -100,7 +99,7 @@ def format_pattern(
         else:
             fluent_args = {}
 
-        errors: List[Exception] = []
+        errors: list[Exception] = []
         env = ResolverEnvironment(
             context=self, current=CurrentEnvironment(args=fluent_args), errors=errors
         )
diff --git a/fluent.runtime/fluent/runtime/fallback.py b/fluent.runtime/fluent/runtime/fallback.py
index 2fb6c85f..831d4288 100644
--- a/fluent.runtime/fluent/runtime/fallback.py
+++ b/fluent.runtime/fluent/runtime/fallback.py
@@ -1,16 +1,7 @@
 import codecs
 import os
-from typing import (
-    TYPE_CHECKING,
-    Any,
-    Callable,
-    Dict,
-    Generator,
-    List,
-    Type,
-    Union,
-    cast,
-)
+from collections.abc import Generator
+from typing import TYPE_CHECKING, Any, Callable, Union, cast
 
 from fluent.syntax import FluentParser
 from typing import NamedTuple
@@ -25,7 +16,7 @@
 
 class FormattedMessage(NamedTuple):
     value: Union[str, None]
-    attributes: Dict[str, str]
+    attributes: dict[str, str]
 
 
 class FluentLocalization:
@@ -38,12 +29,12 @@ class FluentLocalization:
 
     def __init__(
         self,
-        locales: List[str],
-        resource_ids: List[str],
+        locales: list[str],
+        resource_ids: list[str],
         resource_loader: "AbstractResourceLoader",
         use_isolating: bool = False,
-        bundle_class: Type[FluentBundle] = FluentBundle,
-        functions: Union[Dict[str, Callable[[Any], "FluentType"]], None] = None,
+        bundle_class: type[FluentBundle] = FluentBundle,
+        functions: Union[dict[str, Callable[[Any], "FluentType"]], None] = None,
     ):
         self.locales = locales
         self.resource_ids = resource_ids
@@ -51,11 +42,11 @@ def __init__(
         self.use_isolating = use_isolating
         self.bundle_class = bundle_class
         self.functions = functions
-        self._bundle_cache: List[FluentBundle] = []
+        self._bundle_cache: list[FluentBundle] = []
         self._bundle_it = self._iterate_bundles()
 
     def format_message(
-        self, msg_id: str, args: Union[Dict[str, Any], None] = None
+        self, msg_id: str, args: Union[dict[str, Any], None] = None
     ) -> FormattedMessage:
         bundle, msg = next((
             (bundle, bundle.get_message(msg_id))
@@ -82,7 +73,7 @@ def format_message(
         )
 
     def format_value(
-        self, msg_id: str, args: Union[Dict[str, Any], None] = None
+        self, msg_id: str, args: Union[dict[str, Any], None] = None
     ) -> str:
         bundle, msg = next((
             (bundle, bundle.get_message(msg_id))
@@ -96,7 +87,7 @@ def format_value(
             str, val
         )  # Never FluentNone when format_pattern called externally
 
-    def _create_bundle(self, locales: List[str]) -> FluentBundle:
+    def _create_bundle(self, locales: list[str]) -> FluentBundle:
         return self.bundle_class(
             locales, functions=self.functions, use_isolating=self.use_isolating
         )
@@ -128,8 +119,8 @@ class AbstractResourceLoader:
     """
 
     def resources(
-        self, locale: str, resource_ids: List[str]
-    ) -> Generator[List["Resource"], None, None]:
+        self, locale: str, resource_ids: list[str]
+    ) -> Generator[list["Resource"], None, None]:
         """
         Yield lists of FluentResource objects, corresponding to
         each of the resource_ids.
@@ -151,7 +142,7 @@ class FluentResourceLoader(AbstractResourceLoader):
     different roots.
     """
 
-    def __init__(self, roots: Union[str, List[str]]):
+    def __init__(self, roots: Union[str, list[str]]):
         """
         Create a resource loader. The roots may be a string for a single
         location on disk, or a list of strings.
@@ -159,10 +150,10 @@ def __init__(self, roots: Union[str, List[str]]):
         self.roots = [roots] if isinstance(roots, str) else roots
 
     def resources(
-        self, locale: str, resource_ids: List[str]
-    ) -> Generator[List["Resource"], None, None]:
+        self, locale: str, resource_ids: list[str]
+    ) -> Generator[list["Resource"], None, None]:
         for root in self.roots:
-            resources: List[Any] = []
+            resources: list[Any] = []
             for resource_id in resource_ids:
                 path = self.localize_path(os.path.join(root, resource_id), locale)
                 if not os.path.isfile(path):
diff --git a/fluent.runtime/fluent/runtime/prepare.py b/fluent.runtime/fluent/runtime/prepare.py
index 418b33ba..b14aea0b 100644
--- a/fluent.runtime/fluent/runtime/prepare.py
+++ b/fluent.runtime/fluent/runtime/prepare.py
@@ -1,4 +1,4 @@
-from typing import Any, Dict, List
+from typing import Any
 
 from fluent.syntax import ast as FTL
 
@@ -17,7 +17,7 @@ def compile(self, node: Any) -> Any:
         nodename: str = type(node).__name__
         if not hasattr(resolver, nodename):
             return node
-        kwargs: Dict[str, Any] = vars(node).copy()
+        kwargs: dict[str, Any] = vars(node).copy()
         for propname, propvalue in kwargs.items():
             kwargs[propname] = self(propvalue)
         handler = getattr(self, "compile_" + nodename, self.compile_generic)
@@ -31,7 +31,7 @@ def compile_Placeable(self, _: Any, expression: Any, **kwargs: Any) -> Any:
             return expression
         return resolver.Placeable(expression=expression, **kwargs)
 
-    def compile_Pattern(self, _: Any, elements: List[Any], **kwargs: Any) -> Any:
+    def compile_Pattern(self, _: Any, elements: list[Any], **kwargs: Any) -> Any:
         if len(elements) == 1 and isinstance(elements[0], resolver.Placeable):
             # Don't isolate isolated placeables
             return resolver.NeverIsolatingPlaceable(elements[0].expression)
diff --git a/fluent.runtime/fluent/runtime/resolver.py b/fluent.runtime/fluent/runtime/resolver.py
index 1961a960..b42b14c3 100644
--- a/fluent.runtime/fluent/runtime/resolver.py
+++ b/fluent.runtime/fluent/runtime/resolver.py
@@ -1,5 +1,6 @@
 import contextlib
-from typing import TYPE_CHECKING, Any, Dict, Generator, List, Set, Union, cast
+from collections.abc import Generator
+from typing import TYPE_CHECKING, Any, Union, cast
 
 import attr
 from fluent.syntax import ast as FTL
@@ -42,7 +43,7 @@ class CurrentEnvironment:
     # For Messages, VariableReference nodes are interpreted as external args,
     # but for Terms they are the values explicitly passed using CallExpression
     # syntax. So we have to be able to change 'args' for this purpose.
-    args: Dict[str, Any] = attr.ib(factory=dict)
+    args: dict[str, Any] = attr.ib(factory=dict)
     # This controls whether we need to report an error if a VariableReference
     # refers to an arg that is not present in the args dict.
     error_for_missing_arg: bool = attr.ib(default=True)
@@ -51,9 +52,9 @@ class CurrentEnvironment:
 @attr.s
 class ResolverEnvironment:
     context: "FluentBundle" = attr.ib()
-    errors: List[Exception] = attr.ib()
+    errors: list[Exception] = attr.ib()
     part_count: int = attr.ib(default=0, init=False)
-    active_patterns: Set[FTL.Pattern] = attr.ib(factory=set, init=False)
+    active_patterns: set[FTL.Pattern] = attr.ib(factory=set, init=False)
     current: CurrentEnvironment = attr.ib(factory=CurrentEnvironment)
 
     @contextlib.contextmanager
@@ -72,7 +73,7 @@ def modified(
         self.current = old_current
 
     def modified_for_term_reference(
-        self, args: Union[Dict[str, Any], None] = None
+        self, args: Union[dict[str, Any], None] = None
     ) -> Any:
         return self.modified(
             args=args if args is not None else {}, error_for_missing_arg=False
@@ -100,13 +101,13 @@ class Literal(BaseResolver):
 class Message(FTL.Entry, BaseResolver):
     id: "Identifier"
     value: Union["Pattern", None]
-    attributes: Dict[str, "Pattern"]
+    attributes: dict[str, "Pattern"]
 
     def __init__(
         self,
         id: "Identifier",
         value: Union["Pattern", None] = None,
-        attributes: Union[List["Attribute"], None] = None,
+        attributes: Union[list["Attribute"], None] = None,
         comment: Any = None,
         **kwargs: Any,
     ):
@@ -121,13 +122,13 @@ def __init__(
 class Term(FTL.Entry, BaseResolver):
     id: "Identifier"
     value: "Pattern"
-    attributes: Dict[str, "Pattern"]
+    attributes: dict[str, "Pattern"]
 
     def __init__(
         self,
         id: "Identifier",
         value: "Pattern",
-        attributes: Union[List["Attribute"], None] = None,
+        attributes: Union[list["Attribute"], None] = None,
         comment: Any = None,
         **kwargs: Any,
     ):
@@ -143,7 +144,7 @@ class Pattern(FTL.Pattern, BaseResolver):
     # Prevent messages with too many sub parts, for CPI DOS protection
     MAX_PARTS = 1000
 
-    elements: List[Union["TextElement", "Placeable"]]  # type: ignore
+    elements: list[Union["TextElement", "Placeable"]]  # type: ignore
 
     def __init__(self, *args: Any, **kwargs: Any):
         super().__init__(*args, **kwargs)
@@ -294,7 +295,7 @@ def __call__(self, env: ResolverEnvironment) -> Any:
         if isinstance(arg_val, (FluentType, str)):
             return arg_val
         env.errors.append(
-            TypeError("Unsupported external type: {}, {}".format(name, type(arg_val)))
+            TypeError(f"Unsupported external type: {name}, {type(arg_val)}")
         )
         return FluentNone(name)
 
@@ -306,7 +307,7 @@ class Attribute(FTL.Attribute, BaseResolver):
 
 class SelectExpression(FTL.SelectExpression, BaseResolver):
     selector: "InlineExpression"
-    variants: List["Variant"]  # type: ignore
+    variants: list["Variant"]  # type: ignore
 
     def __call__(self, env: ResolverEnvironment) -> Union[str, FluentNone]:
         key = self.selector(env)
@@ -368,8 +369,8 @@ def __call__(self, env: ResolverEnvironment) -> str:
 
 
 class CallArguments(FTL.CallArguments, BaseResolver):
-    positional: List[Union["InlineExpression", Placeable]]  # type: ignore
-    named: List["NamedArgument"]  # type: ignore
+    positional: list[Union["InlineExpression", Placeable]]  # type: ignore
+    named: list["NamedArgument"]  # type: ignore
 
 
 class FunctionReference(FTL.FunctionReference, BaseResolver):
@@ -384,7 +385,7 @@ def __call__(self, env: ResolverEnvironment) -> Any:
             function = env.context._functions[function_name]
         except LookupError:
             env.errors.append(
-                FluentReferenceError("Unknown function: {}".format(function_name))
+                FluentReferenceError(f"Unknown function: {function_name}")
             )
             return FluentNone(function_name + "()")
 
diff --git a/fluent.runtime/fluent/runtime/types.py b/fluent.runtime/fluent/runtime/types.py
index 697a18b7..c6717194 100644
--- a/fluent.runtime/fluent/runtime/types.py
+++ b/fluent.runtime/fluent/runtime/types.py
@@ -1,14 +1,13 @@
 import warnings
 from datetime import date, datetime
 from decimal import Decimal
-from typing import Any, Dict, Type, TypeVar, Union, cast
+from typing import Any, Literal, TypeVar, Union, cast
 
 import attr
 import pytz
 from babel import Locale
 from babel.dates import format_date, format_time, get_datetime_format, get_timezone
 from babel.numbers import NumberPattern, parse_pattern
-from typing_extensions import Literal
 
 FORMAT_STYLE_DECIMAL = "decimal"
 FORMAT_STYLE_CURRENCY = "currency"
@@ -106,7 +105,7 @@ def __new__(
         return self._init(value, kwargs)
 
     def _init(
-        self, value: Union[int, float, Decimal, "FluentNumber"], kwargs: Dict[str, Any]
+        self, value: Union[int, float, Decimal, "FluentNumber"], kwargs: dict[str, Any]
     ) -> "FluentNumber":
         self.options = merge_options(
             NumberFormatOptions,
@@ -211,7 +210,7 @@ def replacer(s: str) -> str:
 
 
 def merge_options(
-    options_class: Type[Options], base: Union[Options, None], kwargs: Dict[str, Any]
+    options_class: type[Options], base: Union[Options, None], kwargs: dict[str, Any]
 ) -> Options:
     """
     Given an 'options_class', an optional 'base' object to copy from,
@@ -346,7 +345,7 @@ class FluentDateType(FluentType):
     # So we leave those alone, and implement another `_init_options`
     # which is called from other constructors.
     def _init_options(
-        self, dt_obj: Union[date, datetime], kwargs: Dict[str, Any]
+        self, dt_obj: Union[date, datetime], kwargs: dict[str, Any]
     ) -> None:
         if "timeStyle" in kwargs and not isinstance(self, datetime):
             raise TypeError(
@@ -437,6 +436,4 @@ def fluent_date(
     elif isinstance(dt, FluentNone):
         return dt
     else:
-        raise TypeError(
-            "Can't use fluent_date with object {} of type {}".format(dt, type(dt))
-        )
+        raise TypeError(f"Can't use fluent_date with object {dt} of type {type(dt)}")
diff --git a/fluent.runtime/pyproject.toml b/fluent.runtime/pyproject.toml
index 163f7cb4..8679443d 100644
--- a/fluent.runtime/pyproject.toml
+++ b/fluent.runtime/pyproject.toml
@@ -1,13 +1,12 @@
 [project]
 name = "fluent.runtime"
 version = "0.4.0"
-requires-python = ">= 3.8"
+requires-python = ">= 3.9"
 dependencies = [
   "fluent.syntax>=0.17,<0.20",
   "attrs",
   "babel",
   "pytz",
-  "typing-extensions>=3.7,<5",
 ]
 license = { text = "Apache-2.0" }
 description = "Localization library for expressive translations."
@@ -21,8 +20,12 @@ classifiers = [
   "Development Status :: 3 - Alpha",
   "Intended Audience :: Developers",
   "License :: OSI Approved :: Apache Software License",
-  "Programming Language :: Python :: 3.8",
   "Programming Language :: Python :: 3.9",
+  "Programming Language :: Python :: 3.10",
+  "Programming Language :: Python :: 3.11",
+  "Programming Language :: Python :: 3.12",
+  "Programming Language :: Python :: 3.13",
+  "Programming Language :: Python :: 3.14",
   "Programming Language :: Python :: 3 :: Only",
 ]
 
diff --git a/fluent.runtime/tools/benchmarks/fluent_benchmark.py b/fluent.runtime/tools/benchmarks/fluent_benchmark.py
index d80de407..83f42912 100644
--- a/fluent.runtime/tools/benchmarks/fluent_benchmark.py
+++ b/fluent.runtime/tools/benchmarks/fluent_benchmark.py
@@ -1,7 +1,6 @@
 #!/usr/bin/env python
 # This should be run using pytest
 
-from __future__ import unicode_literals
 
 import sys
 
@@ -48,7 +47,7 @@ def fluent_template(bundle):
     )
 
 
-class TestBenchmark(object):
+class TestBenchmark:
     def test_template(self, fluent_bundle, benchmark):
         benchmark(lambda: fluent_template(fluent_bundle))
 
diff --git a/fluent.syntax/fluent/syntax/ast.py b/fluent.syntax/fluent/syntax/ast.py
index c47244e5..c13ee1c7 100644
--- a/fluent.syntax/fluent/syntax/ast.py
+++ b/fluent.syntax/fluent/syntax/ast.py
@@ -1,10 +1,10 @@
 import json
 import re
 import sys
-from typing import Any, Callable, Dict, List, TypeVar, Union, cast
+from typing import Any, Callable, TypeVar, Union, cast
 
 Node = TypeVar("Node", bound="BaseNode")
-ToJsonFn = Callable[[Dict[str, Any]], Any]
+ToJsonFn = Callable[[dict[str, Any]], Any]
 
 
 def to_json(value: Any, fn: Union[ToJsonFn, None] = None) -> Any:
@@ -29,7 +29,7 @@ def from_json(value: Any) -> Any:
         return value
 
 
-def scalars_equal(node1: Any, node2: Any, ignored_fields: List[str]) -> bool:
+def scalars_equal(node1: Any, node2: Any, ignored_fields: list[str]) -> bool:
     """Compare two nodes which are not lists."""
 
     if type(node1) is not type(node2):
@@ -66,7 +66,7 @@ def visit(value: Any) -> Any:
             **{name: visit(value) for name, value in vars(self).items()}
         )
 
-    def equals(self, other: "BaseNode", ignored_fields: List[str] = ["span"]) -> bool:
+    def equals(self, other: "BaseNode", ignored_fields: list[str] = ["span"]) -> bool:
         """Compare two nodes.
 
         Nodes are deeply compared on a field by field basis. If possible, False
@@ -126,7 +126,7 @@ def add_span(self, start: int, end: int) -> None:
 
 
 class Resource(SyntaxNode):
-    def __init__(self, body: Union[List["EntryType"], None] = None, **kwargs: Any):
+    def __init__(self, body: Union[list["EntryType"], None] = None, **kwargs: Any):
         super().__init__(**kwargs)
         self.body = body or []
 
@@ -140,7 +140,7 @@ def __init__(
         self,
         id: "Identifier",
         value: Union["Pattern", None] = None,
-        attributes: Union[List["Attribute"], None] = None,
+        attributes: Union[list["Attribute"], None] = None,
         comment: Union["Comment", None] = None,
         **kwargs: Any
     ):
@@ -156,7 +156,7 @@ def __init__(
         self,
         id: "Identifier",
         value: "Pattern",
-        attributes: Union[List["Attribute"], None] = None,
+        attributes: Union[list["Attribute"], None] = None,
         comment: Union["Comment", None] = None,
         **kwargs: Any
     ):
@@ -169,7 +169,7 @@ def __init__(
 
 class Pattern(SyntaxNode):
     def __init__(
-        self, elements: List[Union["TextElement", "Placeable"]], **kwargs: Any
+        self, elements: list[Union["TextElement", "Placeable"]], **kwargs: Any
     ):
         super().__init__(**kwargs)
         self.elements = elements
@@ -206,12 +206,12 @@ def __init__(self, value: str, **kwargs: Any):
         super().__init__(**kwargs)
         self.value = value
 
-    def parse(self) -> Dict[str, Any]:
+    def parse(self) -> dict[str, Any]:
         return {"value": self.value}
 
 
 class StringLiteral(Literal):
-    def parse(self) -> Dict[str, str]:
+    def parse(self) -> dict[str, str]:
         def from_escape_sequence(matchobj: Any) -> str:
             c, codepoint4, codepoint6 = matchobj.groups()
             if c:
@@ -233,7 +233,7 @@ def from_escape_sequence(matchobj: Any) -> str:
 
 
 class NumberLiteral(Literal):
-    def parse(self) -> Dict[str, Union[float, int]]:
+    def parse(self) -> dict[str, Union[float, int]]:
         value = float(self.value)
         decimal_position = self.value.find(".")
         precision = 0
@@ -283,7 +283,7 @@ def __init__(self, id: "Identifier", arguments: "CallArguments", **kwargs: Any):
 
 class SelectExpression(Expression):
     def __init__(
-        self, selector: "InlineExpression", variants: List["Variant"], **kwargs: Any
+        self, selector: "InlineExpression", variants: list["Variant"], **kwargs: Any
     ):
         super().__init__(**kwargs)
         self.selector = selector
@@ -293,8 +293,8 @@ def __init__(
 class CallArguments(SyntaxNode):
     def __init__(
         self,
-        positional: Union[List[Union["InlineExpression", Placeable]], None] = None,
-        named: Union[List["NamedArgument"], None] = None,
+        positional: Union[list[Union["InlineExpression", Placeable]], None] = None,
+        named: Union[list["NamedArgument"], None] = None,
         **kwargs: Any
     ):
         super().__init__(**kwargs)
@@ -366,7 +366,7 @@ class Junk(SyntaxNode):
     def __init__(
         self,
         content: Union[str, None] = None,
-        annotations: Union[List["Annotation"], None] = None,
+        annotations: Union[list["Annotation"], None] = None,
         **kwargs: Any
     ):
         super().__init__(**kwargs)
@@ -388,7 +388,7 @@ class Annotation(SyntaxNode):
     def __init__(
         self,
         code: str,
-        arguments: Union[List[Any], None] = None,
+        arguments: Union[list[Any], None] = None,
         message: Union[str, None] = None,
         **kwargs: Any
     ):
diff --git a/fluent.syntax/fluent/syntax/errors.py b/fluent.syntax/fluent/syntax/errors.py
index b6a59f5b..baa98113 100644
--- a/fluent.syntax/fluent/syntax/errors.py
+++ b/fluent.syntax/fluent/syntax/errors.py
@@ -1,4 +1,4 @@
-from typing import Tuple, Union
+from typing import Union
 
 
 class ParseError(Exception):
@@ -8,15 +8,15 @@ def __init__(self, code: str, *args: Union[str, None]):
         self.message = get_error_message(code, args)
 
 
-def get_error_message(code: str, args: Tuple[Union[str, None], ...]) -> str:
+def get_error_message(code: str, args: tuple[Union[str, None], ...]) -> str:
     if code == "E00001":
         return "Generic error"
     if code == "E0002":
         return "Expected an entry start"
     if code == "E0003":
-        return 'Expected token: "{}"'.format(args[0])
+        return f'Expected token: "{args[0]}"'
     if code == "E0004":
-        return 'Expected a character from range: "{}"'.format(args[0])
+        return f'Expected a character from range: "{args[0]}"'
     if code == "E0005":
         msg = 'Expected message "{}" to have a value or attributes'
         return msg.format(args[0])
@@ -58,9 +58,9 @@ def get_error_message(code: str, args: Tuple[Union[str, None], ...]) -> str:
     if code == "E0024":
         return "Cannot access variants of a message."
     if code == "E0025":
-        return "Unknown escape sequence: \\{}.".format(args[0])
+        return f"Unknown escape sequence: \\{args[0]}."
     if code == "E0026":
-        return "Invalid Unicode escape sequence: {}.".format(args[0])
+        return f"Invalid Unicode escape sequence: {args[0]}."
     if code == "E0027":
         return "Unbalanced closing brace in TextElement."
     if code == "E0028":
diff --git a/fluent.syntax/fluent/syntax/parser.py b/fluent.syntax/fluent/syntax/parser.py
index 5999f97c..5888c448 100644
--- a/fluent.syntax/fluent/syntax/parser.py
+++ b/fluent.syntax/fluent/syntax/parser.py
@@ -1,5 +1,5 @@
 import re
-from typing import Any, Callable, List, Set, TypeVar, Union, cast
+from typing import Any, Callable, TypeVar, Union, cast
 
 from . import ast
 from .errors import ParseError
@@ -45,7 +45,7 @@ def parse(self, source: str) -> ast.Resource:
         ps = FluentParserStream(source)
         ps.skip_blank_block()
 
-        entries: List[ast.EntryType] = []
+        entries: list[ast.EntryType] = []
         last_comment = None
 
         while ps.current_char:
@@ -236,8 +236,8 @@ def get_attribute(self, ps: FluentParserStream) -> ast.Attribute:
 
         return ast.Attribute(key, value)
 
-    def get_attributes(self, ps: FluentParserStream) -> List[ast.Attribute]:
-        attrs: List[ast.Attribute] = []
+    def get_attributes(self, ps: FluentParserStream) -> list[ast.Attribute]:
+        attrs: list[ast.Attribute] = []
         ps.peek_blank()
 
         while ps.is_attribute_start():
@@ -299,8 +299,8 @@ def get_variant(self, ps: FluentParserStream, has_default: bool) -> ast.Variant:
 
         return ast.Variant(key, value, default_index)
 
-    def get_variants(self, ps: FluentParserStream) -> List[ast.Variant]:
-        variants: List[ast.Variant] = []
+    def get_variants(self, ps: FluentParserStream) -> list[ast.Variant]:
+        variants: list[ast.Variant] = []
         has_default = False
 
         ps.skip_blank()
@@ -376,7 +376,7 @@ def maybe_get_pattern(self, ps: FluentParserStream) -> Union[ast.Pattern, None]:
 
     @with_span
     def get_pattern(self, ps: FluentParserStream, is_block: bool) -> ast.Pattern:
-        elements: List[Any] = []
+        elements: list[Any] = []
         if is_block:
             # A block pattern is a pattern which starts on a new line. Measure
             # the indent of this first line for the dedentation logic.
@@ -422,20 +422,20 @@ def get_pattern(self, ps: FluentParserStream, is_block: bool) -> ast.Pattern:
 
     class Indent(ast.SyntaxNode):
         def __init__(self, value: str, start: int, end: int):
-            super(FluentParser.Indent, self).__init__()
+            super().__init__()
             self.value = value
             self.add_span(start, end)
 
     def dedent(
         self,
-        elements: List[Union[ast.TextElement, ast.Placeable, Indent]],
+        elements: list[Union[ast.TextElement, ast.Placeable, Indent]],
         common_indent: int,
-    ) -> List[Union[ast.TextElement, ast.Placeable]]:
+    ) -> list[Union[ast.TextElement, ast.Placeable]]:
         """Dedent a list of elements by removing the maximum common indent from
         the beginning of text lines. The common indent is calculated in
         get_pattern.
         """
-        trimmed: List[Union[ast.TextElement, ast.Placeable]] = []
+        trimmed: list[Union[ast.TextElement, ast.Placeable]] = []
 
         for element in elements:
             if isinstance(element, ast.Placeable):
@@ -660,9 +660,9 @@ def get_call_argument(
 
     @with_span
     def get_call_arguments(self, ps: FluentParserStream) -> ast.CallArguments:
-        positional: List[Union[ast.InlineExpression, ast.Placeable]] = []
-        named: List[ast.NamedArgument] = []
-        argument_names: Set[str] = set()
+        positional: list[Union[ast.InlineExpression, ast.Placeable]] = []
+        named: list[ast.NamedArgument] = []
+        argument_names: set[str] = set()
 
         ps.expect_char("(")
         ps.skip_blank()
diff --git a/fluent.syntax/fluent/syntax/serializer.py b/fluent.syntax/fluent/syntax/serializer.py
index 3659154c..414dce19 100644
--- a/fluent.syntax/fluent/syntax/serializer.py
+++ b/fluent.syntax/fluent/syntax/serializer.py
@@ -1,4 +1,4 @@
-from typing import List, Union
+from typing import Union
 
 from . import ast
 
@@ -46,11 +46,11 @@ def __init__(self, with_junk: bool = False):
     def serialize(self, resource: ast.Resource) -> str:
         "Serialize a :class:`.ast.Resource` to a string."
         if not isinstance(resource, ast.Resource):
-            raise Exception("Unknown resource type: {}".format(type(resource)))
+            raise Exception(f"Unknown resource type: {type(resource)}")
 
         state = 0
 
-        parts: List[str] = []
+        parts: list[str] = []
         for entry in resource.body:
             if not isinstance(entry, ast.Junk) or self.with_junk:
                 parts.append(self.serialize_entry(entry, state))
@@ -79,7 +79,7 @@ def serialize_entry(self, entry: ast.EntryType, state: int = 0) -> str:
             return "{}\n".format(serialize_comment(entry, "###"))
         if isinstance(entry, ast.Junk):
             return serialize_junk(entry)
-        raise Exception("Unknown entry type: {}".format(type(entry)))
+        raise Exception(f"Unknown entry type: {type(entry)}")
 
 
 def serialize_comment(
@@ -104,7 +104,7 @@ def serialize_junk(junk: ast.Junk) -> str:
 
 
 def serialize_message(message: ast.Message) -> str:
-    parts: List[str] = []
+    parts: list[str] = []
 
     if message.comment:
         parts.append(serialize_comment(message.comment))
@@ -123,7 +123,7 @@ def serialize_message(message: ast.Message) -> str:
 
 
 def serialize_term(term: ast.Term) -> str:
-    parts: List[str] = []
+    parts: list[str] = []
 
     if term.comment:
         parts.append(serialize_comment(term.comment))
@@ -160,20 +160,20 @@ def serialize_element(element: ast.PatternElement) -> str:
         return element.value
     if isinstance(element, ast.Placeable):
         return serialize_placeable(element)
-    raise Exception("Unknown element type: {}".format(type(element)))
+    raise Exception(f"Unknown element type: {type(element)}")
 
 
 def serialize_placeable(placeable: ast.Placeable) -> str:
     expr = placeable.expression
     if isinstance(expr, ast.Placeable):
-        return "{{{}}}".format(serialize_placeable(expr))
+        return f"{{{serialize_placeable(expr)}}}"
     if isinstance(expr, ast.SelectExpression):
         # Special-case select expressions to control the withespace around the
         # opening and the closing brace.
-        return "{{ {}}}".format(serialize_expression(expr))
+        return f"{{ {serialize_expression(expr)}}}"
     if isinstance(expr, ast.Expression):
-        return "{{ {} }}".format(serialize_expression(expr))
-    raise Exception("Unknown expression type: {}".format(type(expr)))
+        return f"{{ {serialize_expression(expr)} }}"
+    raise Exception(f"Unknown expression type: {type(expr)}")
 
 
 def serialize_expression(expression: Union[ast.Expression, ast.Placeable]) -> str:
@@ -199,13 +199,13 @@ def serialize_expression(expression: Union[ast.Expression, ast.Placeable]) -> st
         args = serialize_call_arguments(expression.arguments)
         return f"{expression.id.name}{args}"
     if isinstance(expression, ast.SelectExpression):
-        out = "{} ->".format(serialize_expression(expression.selector))
+        out = f"{serialize_expression(expression.selector)} ->"
         for variant in expression.variants:
             out += serialize_variant(variant)
         return f"{out}\n"
     if isinstance(expression, ast.Placeable):
         return serialize_placeable(expression)
-    raise Exception("Unknown expression type: {}".format(type(expression)))
+    raise Exception(f"Unknown expression type: {type(expression)}")
 
 
 def serialize_variant(variant: ast.Variant) -> str:
@@ -221,11 +221,11 @@ def serialize_call_arguments(expr: ast.CallArguments) -> str:
     named = ", ".join(serialize_named_argument(arg) for arg in expr.named)
     if len(expr.positional) > 0 and len(expr.named) > 0:
         return f"({positional}, {named})"
-    return "({})".format(positional or named)
+    return f"({positional or named})"
 
 
 def serialize_named_argument(arg: ast.NamedArgument) -> str:
-    return "{}: {}".format(arg.name.name, serialize_expression(arg.value))
+    return f"{arg.name.name}: {serialize_expression(arg.value)}"
 
 
 def serialize_variant_key(key: Union[ast.Identifier, ast.NumberLiteral]) -> str:
@@ -233,4 +233,4 @@ def serialize_variant_key(key: Union[ast.Identifier, ast.NumberLiteral]) -> str:
         return key.name
     if isinstance(key, ast.NumberLiteral):
         return key.value
-    raise Exception("Unknown variant key type: {}".format(type(key)))
+    raise Exception(f"Unknown variant key type: {type(key)}")
diff --git a/fluent.syntax/fluent/syntax/stream.py b/fluent.syntax/fluent/syntax/stream.py
index 0e276fc3..2a485e22 100644
--- a/fluent.syntax/fluent/syntax/stream.py
+++ b/fluent.syntax/fluent/syntax/stream.py
@@ -1,6 +1,4 @@
-from typing import Callable, Union
-
-from typing_extensions import Literal
+from typing import Callable, Literal, Union
 
 from .errors import ParseError
 
diff --git a/fluent.syntax/fluent/syntax/visitor.py b/fluent.syntax/fluent/syntax/visitor.py
index 2f637afb..53fea500 100644
--- a/fluent.syntax/fluent/syntax/visitor.py
+++ b/fluent.syntax/fluent/syntax/visitor.py
@@ -1,4 +1,4 @@
-from typing import Any, List
+from typing import Any
 
 from .ast import BaseNode, Node
 
@@ -50,7 +50,7 @@ def visit(self, node: Any) -> Any:
     def generic_visit(self, node: Node) -> Node:  # type: ignore
         for propname, propvalue in vars(node).items():
             if isinstance(propvalue, list):
-                new_vals: List[Any] = []
+                new_vals: list[Any] = []
                 for child in propvalue:
                     new_val = self.visit(child)
                     if new_val is not None:
diff --git a/fluent.syntax/pyproject.toml b/fluent.syntax/pyproject.toml
index 013291fb..5a0ba99a 100644
--- a/fluent.syntax/pyproject.toml
+++ b/fluent.syntax/pyproject.toml
@@ -1,8 +1,7 @@
 [project]
 name = "fluent.syntax"
 version = "0.19.0"
-requires-python = ">= 3.8"
-dependencies = ["typing-extensions>=3.7,<5"]
+requires-python = ">= 3.9"
 license = { text = "Apache-2.0" }
 description = "Localization library for expressive translations."
 keywords = ["fluent", "localization", "l10n"]
@@ -14,8 +13,12 @@ classifiers = [
   "Development Status :: 3 - Alpha",
   "Intended Audience :: Developers",
   "License :: OSI Approved :: Apache Software License",
-  "Programming Language :: Python :: 3.8",
   "Programming Language :: Python :: 3.9",
+  "Programming Language :: Python :: 3.10",
+  "Programming Language :: Python :: 3.11",
+  "Programming Language :: Python :: 3.12",
+  "Programming Language :: Python :: 3.13",
+  "Programming Language :: Python :: 3.14",
   "Programming Language :: Python :: 3 :: Only",
 ]
 
diff --git a/pyproject.toml b/pyproject.toml
index 567f3ca0..8ff24004 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,7 +1,7 @@
 [project]
 name = "python-fluent"
 version = "0"
-requires-python = ">= 3.8.1"
+requires-python = ">= 3.9"
 dependencies = [
   "fluent.syntax",
   "black ~= 24.0",
diff --git a/uv.lock b/uv.lock
index 777227e3..44fcc13e 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1,10 +1,9 @@
 version = 1
 revision = 3
-requires-python = ">=3.8.1"
+requires-python = ">=3.9"
 resolution-markers = [
     "python_full_version >= '3.10'",
-    "python_full_version == '3.9.*'",
-    "python_full_version < '3.9'",
+    "python_full_version < '3.10'",
 ]
 
 [manifest]
@@ -14,26 +13,10 @@ members = [
     "python-fluent",
 ]
 
-[[package]]
-name = "attrs"
-version = "25.3.0"
-source = { registry = "https://pypi.org/simple" }
-resolution-markers = [
-    "python_full_version < '3.9'",
-]
-sdist = { url = "https://files.pythonhosted.org/packages/5a/b0/1367933a8532ee6ff8d63537de4f1177af4bff9f3e829baf7331f595bb24/attrs-25.3.0.tar.gz", hash = "sha256:75d7cefc7fb576747b2c81b4442d4d4a1ce0900973527c011d1030fd3bf4af1b", size = 812032, upload-time = "2025-03-13T11:10:22.779Z" }
-wheels = [
-    { url = "https://files.pythonhosted.org/packages/77/06/bb80f5f86020c4551da315d78b3ab75e8228f89f0162f2c3a819e407941a/attrs-25.3.0-py3-none-any.whl", hash = "sha256:427318ce031701fea540783410126f03899a97ffc6f61596ad581ac2e40e3bc3", size = 63815, upload-time = "2025-03-13T11:10:21.14Z" },
-]
-
 [[package]]
 name = "attrs"
 version = "25.4.0"
 source = { registry = "https://pypi.org/simple" }
-resolution-markers = [
-    "python_full_version >= '3.10'",
-    "python_full_version == '3.9.*'",
-]
 sdist = { url = "https://files.pythonhosted.org/packages/6b/5c/685e6633917e101e5dcb62b9dd76946cbb57c26e133bae9e0cd36033c0a9/attrs-25.4.0.tar.gz", hash = "sha256:16d5969b87f0859ef33a48b35d55ac1be6e42ae49d5e853b597db70c35c57e11", size = 934251, upload-time = "2025-10-06T13:54:44.725Z" }
 wheels = [
     { url = "https://files.pythonhosted.org/packages/3a/2a/7cc015f5b9f5db42b7d48157e23356022889fc354a2813c15934b7cb5c0e/attrs-25.4.0-py3-none-any.whl", hash = "sha256:adcf7e2a1fb3b36ac48d97835bb6d8ade15b8dcce26aba8bf1d14847b57a3373", size = 67615, upload-time = "2025-10-06T13:54:43.17Z" },
@@ -43,73 +26,25 @@ wheels = [
 name = "babel"
 version = "2.17.0"
 source = { registry = "https://pypi.org/simple" }
-dependencies = [
-    { name = "pytz", marker = "python_full_version < '3.9'" },
-]
 sdist = { url = "https://files.pythonhosted.org/packages/7d/6b/d52e42361e1aa00709585ecc30b3f9684b3ab62530771402248b1b1d6240/babel-2.17.0.tar.gz", hash = "sha256:0c54cffb19f690cdcc52a3b50bcbf71e07a808d1c80d549f2459b9d2cf0afb9d", size = 9951852, upload-time = "2025-02-01T15:17:41.026Z" }
 wheels = [
     { url = "https://files.pythonhosted.org/packages/b7/b8/3fe70c75fe32afc4bb507f75563d39bc5642255d1d94f1f23604725780bf/babel-2.17.0-py3-none-any.whl", hash = "sha256:4d0b53093fdfb4b21c92b5213dba5a1b23885afa8383709427046b21c366e5f2", size = 10182537, upload-time = "2025-02-01T15:17:37.39Z" },
 ]
 
-[[package]]
-name = "black"
-version = "24.8.0"
-source = { registry = "https://pypi.org/simple" }
-resolution-markers = [
-    "python_full_version < '3.9'",
-]
-dependencies = [
-    { name = "click", version = "8.1.8", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.9'" },
-    { name = "mypy-extensions", marker = "python_full_version < '3.9'" },
-    { name = "packaging", marker = "python_full_version < '3.9'" },
-    { name = "pathspec", marker = "python_full_version < '3.9'" },
-    { name = "platformdirs", version = "4.3.6", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.9'" },
-    { name = "tomli", marker = "python_full_version < '3.9'" },
-    { name = "typing-extensions", version = "4.13.2", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.9'" },
-]
-sdist = { url = "https://files.pythonhosted.org/packages/04/b0/46fb0d4e00372f4a86a6f8efa3cb193c9f64863615e39010b1477e010578/black-24.8.0.tar.gz", hash = "sha256:2500945420b6784c38b9ee885af039f5e7471ef284ab03fa35ecdde4688cd83f", size = 644810, upload-time = "2024-08-02T17:43:18.405Z" }
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