diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 634cf7b..6a97559 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,7 +18,7 @@ jobs:
       fail-fast: false
       matrix:
         platform: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
     runs-on: ${{matrix.platform}}
     steps:
     - name: Checkout
diff --git a/pyproject.toml b/pyproject.toml
index 124fd23..3c419fc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,7 @@ name = "dask-histogram"
 description = "Histogramming with Dask."
 readme = "README.md"
 license = {text = "BSD-3-Clause"}
-requires-python = ">=3.9"
+requires-python = ">=3.8"
 authors = [
     { name = "Doug Davis", email = "ddavis@ddavis.io" },
 ]
@@ -16,6 +16,7 @@ classifiers = [
     "License :: OSI Approved :: BSD License",
     "Programming Language :: Python :: 3",
     "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",
@@ -104,6 +105,7 @@ ignore_missing_imports = true
 ignore = "D105"
 
 [tool.ruff]
+target-version = "py38"
 line-length = 88
 src = ["src", "tests"]