diff --git a/.github/workflows/ci-additional.yaml b/.github/workflows/ci-additional.yaml
index 790b751ee..c71fc8913 100644
--- a/.github/workflows/ci-additional.yaml
+++ b/.github/workflows/ci-additional.yaml
@@ -41,7 +41,7 @@ jobs:
 
     env:
       CONDA_ENV_FILE: ci/environment.yml
-      PYTHON_VERSION: "3.10"
+      PYTHON_VERSION: "3.11"
 
     steps:
       - uses: actions/checkout@v4
@@ -92,7 +92,7 @@ jobs:
         shell: bash -l {0}
     env:
       CONDA_ENV_FILE: ci/environment.yml
-      PYTHON_VERSION: "3.10"
+      PYTHON_VERSION: "3.11"
 
     steps:
       - uses: actions/checkout@v4
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 43985f508..b963d671d 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -25,7 +25,7 @@ jobs:
       fail-fast: false
       matrix:
         os: ["ubuntu-latest", "windows-latest"]
-        python-version: ["3.8", "3.10"]
+        python-version: ["3.9", "3.11"]
     steps:
       - uses: actions/checkout@v4
         with:
diff --git a/.github/workflows/testpypi-release.yaml b/.github/workflows/testpypi-release.yaml
index 858348e6d..3b5f98b17 100644
--- a/.github/workflows/testpypi-release.yaml
+++ b/.github/workflows/testpypi-release.yaml
@@ -24,7 +24,7 @@ jobs:
       - uses: actions/setup-python@v4
         name: Install Python
         with:
-          python-version: "3.10"
+          python-version: "3.11"
 
       - name: Install dependencies
         run: |
@@ -65,7 +65,7 @@ jobs:
       - uses: actions/setup-python@v4
         name: Install Python
         with:
-          python-version: "3.10"
+          python-version: "3.11"
       - uses: actions/download-artifact@v3
         with:
           name: releases
diff --git a/.github/workflows/upstream-dev-ci.yaml b/.github/workflows/upstream-dev-ci.yaml
index 7d87be16a..80ad81ac6 100644
--- a/.github/workflows/upstream-dev-ci.yaml
+++ b/.github/workflows/upstream-dev-ci.yaml
@@ -26,7 +26,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.10"]
+        python-version: ["3.11"]
     steps:
       - uses: actions/checkout@v4
         with:
diff --git a/flox/core.py b/flox/core.py
index f8f700f99..98c37bc6f 100644
--- a/flox/core.py
+++ b/flox/core.py
@@ -7,16 +7,14 @@
 import sys
 import warnings
 from collections import namedtuple
+from collections.abc import Mapping, Sequence
 from functools import partial, reduce
 from numbers import Integral
 from typing import (
     TYPE_CHECKING,
     Any,
     Callable,
-    Dict,
     Literal,
-    Mapping,
-    Sequence,
     Union,
     overload,
 )
@@ -74,8 +72,8 @@
     T_IsBins = Union[bool | Sequence[bool]]
 
 
-IntermediateDict = Dict[Union[str, Callable], Any]
-FinalResultsDict = Dict[str, Union["DaskArray", np.ndarray]]
+IntermediateDict = dict[Union[str, Callable], Any]
+FinalResultsDict = dict[str, Union["DaskArray", np.ndarray]]
 FactorProps = namedtuple("FactorProps", "offset_group nan_sentinel nanmask")
 
 # This dummy axis is inserted using np.expand_dims
diff --git a/flox/xarray.py b/flox/xarray.py
index 487850ca0..c85ad7113 100644
--- a/flox/xarray.py
+++ b/flox/xarray.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING, Any, Hashable, Iterable, Sequence, Union
+from collections.abc import Hashable, Iterable, Sequence
+from typing import TYPE_CHECKING, Any, Union
 
 import numpy as np
 import pandas as pd
diff --git a/flox/xrutils.py b/flox/xrutils.py
index 958bd3976..4f80ec8c8 100644
--- a/flox/xrutils.py
+++ b/flox/xrutils.py
@@ -2,7 +2,8 @@
 # defined in xarray
 
 import datetime
-from typing import Any, Iterable
+from collections.abc import Iterable
+from typing import Any
 
 import numpy as np
 import pandas as pd
diff --git a/pyproject.toml b/pyproject.toml
index fb27ee761..e41fb17eb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -3,7 +3,7 @@ name = "flox"
 description = "GroupBy operations for dask.array"
 license = {file = "LICENSE"}
 readme = "README.md"
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 keywords = ["xarray", "dask", "groupby"]
 classifiers = [
     "Development Status :: 4 - Beta",
@@ -11,7 +11,6 @@ classifiers = [
     "Natural Language :: English",
     "Operating System :: OS Independent",
     "Programming Language :: Python",
-    "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
@@ -60,10 +59,10 @@ write_to_template= '__version__ = "{version}"'
 
 [tool.black]
 line-length = 100
-target-version = ["py38"]
+target-version = ["py39"]
 
 [tool.ruff]
-target-version = "py38"
+target-version = "py39"
 builtins = ["ellipsis"]
 exclude = [
     ".eggs",