diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 5639182..2ca8b63 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     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: py ${{ matrix.python-version }}
     steps:
       - uses: actions/checkout@v4
diff --git a/pyproject.toml b/pyproject.toml
index 06ad96c..e345be0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,7 +27,7 @@ keywords = [
     "altair",
     "sphinxext"
 ]
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 dynamic = ["version"]
 license-files = { paths = ["LICENSE"] }
 classifiers= [
@@ -36,7 +36,6 @@ classifiers= [
     "License :: OSI Approved :: BSD License",
     "Natural Language :: English",
     "Framework :: Sphinx :: Extension",
-    "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
@@ -78,7 +77,7 @@ default-args = ["--numprocesses=logical","--doctest-modules", "tests"]
 parallel = true
 
 [[tool.hatch.envs.hatch-test.matrix]]
-python = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+python = ["3.9", "3.10", "3.11", "3.12"]
 
 [tool.hatch.envs.hatch-test.scripts]
 run = [
@@ -100,7 +99,7 @@ build-html = ["sphinx-build -b html tests/roots/test-altairplot tests/roots/test
 serve = ["(cd tests/roots/test-altairplot/_build/html && python -m http.server)"]
 
 [tool.ruff]
-target-version = "py38"
+target-version = "py39"
 line-length = 88
 indent-width = 4
 exclude = []
diff --git a/tests/conftest.py b/tests/conftest.py
index 601f9d3..8fd3b0a 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,4 +1,4 @@
-import sys
+from pathlib import Path
 
 import pytest
 
@@ -8,15 +8,7 @@
 # Exclude 'roots' dirs for pytest test collector
 collect_ignore = ["roots"]
 
-if sys.version_info >= (3, 9):
-    from pathlib import Path
 
-    @pytest.fixture(scope="session")
-    def rootdir():
-        return Path(__file__).parent / "roots"
-else:
-    from sphinx.testing.path import path
-
-    @pytest.fixture(scope="session")
-    def rootdir():
-        return path(__file__).parent.abspath() / "roots"
+@pytest.fixture(scope="session")
+def rootdir():
+    return Path(__file__).parent / "roots"