diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 1ce9b16..10e4ac7 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -9,7 +9,10 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        python-version: [3.9, '3.10']
+        python-version:
+          - 3.11
+          - 3.12
+          - 3.13
     timeout-minutes: 5
 
     steps:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 907ee8d..8566462 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,8 +5,12 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Changed
+- Add support for Python 3.11, 3.12 and 3.13.
+
 ### Removed
 - Drop support for GeoIP and `guess_timezone_by_ip()`.
+- Drop support for Python 3.9 and 3.10.
 
 ## [2.2.0] - 2023-03-06
 ### Added
diff --git a/poetry.lock b/poetry.lock
index cfe539a..b8462eb 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -22,20 +22,6 @@ files = [
     {file = "distlib-0.3.9.tar.gz", hash = "sha256:a60f20dea646b8a33f3e7772f74dc0b2d0772d2837ee1342a00645c81edf9403"},
 ]
 
-[[package]]
-name = "exceptiongroup"
-version = "1.2.2"
-description = "Backport of PEP 654 (exception groups)"
-optional = false
-python-versions = ">=3.7"
-files = [
-    {file = "exceptiongroup-1.2.2-py3-none-any.whl", hash = "sha256:3111b9d131c238bec2f8f516e123e14ba243563fb135d3fe885990585aa7795b"},
-    {file = "exceptiongroup-1.2.2.tar.gz", hash = "sha256:47c2edf7c6738fafb49fd34290706d1a1a2f4d1c6df275526b62cbb4aa5393cc"},
-]
-
-[package.extras]
-test = ["pytest (>=6)"]
-
 [[package]]
 name = "filelock"
 version = "3.16.1"
@@ -63,9 +49,6 @@ files = [
     {file = "importlib_resources-6.4.5.tar.gz", hash = "sha256:980862a1d16c9e147a59603677fa2aa5fd82b87f223b6cb870695bcfce830065"},
 ]
 
-[package.dependencies]
-zipp = {version = ">=3.1.0", markers = "python_version < \"3.10\""}
-
 [package.extras]
 check = ["pytest-checkdocs (>=2.4)", "pytest-ruff (>=0.2.1)"]
 cover = ["pytest-cov"]
@@ -119,7 +102,6 @@ files = [
 
 [package.dependencies]
 mypy-extensions = ">=0.4.3"
-tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
 typing-extensions = ">=3.10"
 
 [package.extras]
@@ -204,11 +186,9 @@ files = [
 
 [package.dependencies]
 colorama = {version = "*", markers = "sys_platform == \"win32\""}
-exceptiongroup = {version = ">=1.0.0rc8", markers = "python_version < \"3.11\""}
 iniconfig = "*"
 packaging = "*"
 pluggy = ">=0.12,<2.0"
-tomli = {version = ">=1.0.0", markers = "python_version < \"3.11\""}
 
 [package.extras]
 testing = ["argcomplete", "attrs (>=19.2.0)", "hypothesis (>=3.56)", "mock", "nose", "pygments (>=2.7.2)", "requests", "setuptools", "xmlschema"]
@@ -250,17 +230,6 @@ files = [
     {file = "six-1.16.0.tar.gz", hash = "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926"},
 ]
 
-[[package]]
-name = "tomli"
-version = "2.1.0"
-description = "A lil' TOML parser"
-optional = false
-python-versions = ">=3.8"
-files = [
-    {file = "tomli-2.1.0-py3-none-any.whl", hash = "sha256:a5c57c3d1c56f5ccdf89f6523458f60ef716e210fc47c4cfb188c5ba473e0391"},
-    {file = "tomli-2.1.0.tar.gz", hash = "sha256:3f646cae2aec94e17d04973e4249548320197cfabdf130015d023de4b74d8ab8"},
-]
-
 [[package]]
 name = "tox"
 version = "3.28.0"
@@ -279,7 +248,6 @@ packaging = ">=14"
 pluggy = ">=0.12.0"
 py = ">=1.4.17"
 six = ">=1.14.0"
-tomli = {version = ">=2.0.1", markers = "python_version >= \"3.7\" and python_version < \"3.11\""}
 virtualenv = ">=16.0.0,<20.0.0 || >20.0.0,<20.0.1 || >20.0.1,<20.0.2 || >20.0.2,<20.0.3 || >20.0.3,<20.0.4 || >20.0.4,<20.0.5 || >20.0.5,<20.0.6 || >20.0.6,<20.0.7 || >20.0.7"
 
 [package.extras]
@@ -335,26 +303,7 @@ platformdirs = ">=3.9.1,<5"
 docs = ["furo (>=2023.7.26)", "proselint (>=0.13)", "sphinx (>=7.1.2,!=7.3)", "sphinx-argparse (>=0.4)", "sphinxcontrib-towncrier (>=0.2.1a0)", "towncrier (>=23.6)"]
 test = ["covdefaults (>=2.3)", "coverage (>=7.2.7)", "coverage-enable-subprocess (>=1)", "flaky (>=3.7)", "packaging (>=23.1)", "pytest (>=7.4)", "pytest-env (>=0.8.2)", "pytest-freezer (>=0.4.8)", "pytest-mock (>=3.11.1)", "pytest-randomly (>=3.12)", "pytest-timeout (>=2.1)", "setuptools (>=68)", "time-machine (>=2.10)"]
 
-[[package]]
-name = "zipp"
-version = "3.21.0"
-description = "Backport of pathlib-compatible object wrapper for zip files"
-optional = false
-python-versions = ">=3.9"
-files = [
-    {file = "zipp-3.21.0-py3-none-any.whl", hash = "sha256:ac1bbe05fd2991f160ebce24ffbac5f6d11d83dc90891255885223d42b3cd931"},
-    {file = "zipp-3.21.0.tar.gz", hash = "sha256:2c9958f6430a2040341a52eb608ed6dd93ef4392e02ffe219417c1b28b5dd1f4"},
-]
-
-[package.extras]
-check = ["pytest-checkdocs (>=2.4)", "pytest-ruff (>=0.2.1)"]
-cover = ["pytest-cov"]
-doc = ["furo", "jaraco.packaging (>=9.3)", "jaraco.tidelift (>=1.4)", "rst.linker (>=1.9)", "sphinx (>=3.5)", "sphinx-lint"]
-enabler = ["pytest-enabler (>=2.2)"]
-test = ["big-O", "importlib-resources", "jaraco.functools", "jaraco.itertools", "jaraco.test", "more-itertools", "pytest (>=6,!=8.1.*)", "pytest-ignore-flaky"]
-type = ["pytest-mypy"]
-
 [metadata]
 lock-version = "2.0"
-python-versions = "^3.9"
-content-hash = "8306695c515f6a7c5f898dc5283948707b1519510b938ab2d96d09c52620f039"
+python-versions = "^3.11"
+content-hash = "d6b8b5a7f0161c5613a3600f82e4be51e4a5860d521c1396fd329be649a2eaf1"
diff --git a/pyproject.toml b/pyproject.toml
index f24ee8b..5bc789f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,8 +11,9 @@ classifiers = [
     "Operating System :: OS Independent",
     "Programming Language :: Python",
     "Programming Language :: Python :: 3",
-    "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",
     "Topic :: Software Development :: Libraries :: Python Modules",
 ]
 homepage = "https://doist.com"
@@ -20,7 +21,7 @@ authors = ["Doist Developers <dev@doist.com>"]
 readme = "README.md"
 
 [tool.poetry.dependencies]
-python = "^3.9"
+python = "^3.11"
 
 [tool.poetry.dev-dependencies]
 pytest = "^7.1.2"
diff --git a/tox.ini b/tox.ini
index 3095dac..da782b7 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,11 +1,12 @@
 [tox]
-envlist = mypy, py39, py310
+envlist = mypy, py311, py312, py313
 isolated_build = True
 
 [gh-actions]
 python =
-    3.9: py39, mypy
-    3.10: py310
+    3.11: py311, mypy
+    3.12: py312
+    3.13: py313
 
 [testenv]
 deps =