diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 861466d..bf6119a 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -16,7 +16,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.9', '3.10', '3.11', '3.12']
 
     name: Python ${{ matrix.python-version}}
     steps:
diff --git a/HISTORY.rst b/HISTORY.rst
index 1cb3e48..b8826a7 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -1,6 +1,14 @@
 History
 =======
 
+5.1.0 (in development)
+----------------------
+
+**Backwards incompatible changes**
+
+* Dropped support for Python 3.8 (#160)
+
+
 5.0.0 (June 24th, 2024)
 -----------------------
 
@@ -35,7 +43,7 @@ History
 * Add ``RegisteredMetricsFilter`` metrics filter making it easier to enforce
   metrics can only be emitted if documented. (#15)
 
-**Backwards incompatibel changes**
+**Backwards incompatible changes**
 
 * Dropped support for Python 3.7 (#121)
 
diff --git a/Makefile b/Makefile
index e83b3b0..dcea49c 100644
--- a/Makefile
+++ b/Makefile
@@ -15,11 +15,11 @@ clean:  ## Clean build artifacts
 
 .PHONY: format
 format:  ## Format files
-	tox exec -e py38-lint -- ruff format
+	tox exec -e py39-lint -- ruff format
 
 .PHONY: lint
 lint:  ## Lint files
-	tox -e py38-lint
+	tox -e py39-lint
 
 .PHONY: test
 test:  ## Run tox to test across supported Python versions
diff --git a/pyproject.toml b/pyproject.toml
index d8ebe91..87a59fd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,7 +6,7 @@ readme = "README.rst"
 keywords = ["metrics", "datadog", "statsd"]
 authors = [{name = "Will Kahn-Greene"}]
 license = {text = "MPLv2"}
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 dependencies = []
 classifiers = [
     "Development Status :: 5 - Production/Stable",
@@ -14,7 +14,6 @@ classifiers = [
     "License :: OSI Approved :: Mozilla Public License 2.0 (MPL 2.0)",
     "Natural Language :: English",
     "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
@@ -36,8 +35,7 @@ dev = [
     "check-manifest",
     "pytest",
     "ruff",
-    "Sphinx==6.2.1; python_version <= '3.8'",
-    "Sphinx; python_version > '3.8'",
+    "Sphinx",
     "sphinx_rtd_theme",
     "time-machine",
     "tomli>=1.1.0; python_version < '3.11'",
@@ -55,7 +53,7 @@ build-backend = "setuptools.build_meta"
 
 [tool.ruff]
 line-length = 88
-target-version = "py38"
+target-version = "py39"
 src = ["src"]
 
 [tool.ruff.lint]
@@ -79,16 +77,14 @@ filterwarnings = [
 legacy_tox_ini = """
 [tox]
 envlist =
-    py38
-    py38-lint
     py39
+    py39-lint
     py310
     py311
     py312
 
 [gh-actions]
 python =
-    3.8: py38
     3.9: py39
     3.10: py310
     3.11: py311
@@ -100,8 +96,9 @@ commands =
     pytest {posargs} tests/
     pytest --doctest-modules --pyargs markus
 
-[testenv:py38-lint]
-basepython = python3.8
+[testenv:py39-lint]
+allowlist_externals = ruff
+basepython = python3.9
 changedir = {toxinidir}
 commands = 
     ruff format --check src tests