diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 49d1a9241..e4ea4c5a3 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -411,7 +411,8 @@ jobs:
       - uses: actions/setup-python@v5
         id: setup-python
         with:
-          python-version: "3.12"
+          # Set this to the oldest Python version supported by BinderHub
+          python-version: "3.10"
 
       - name: Cache pip
         uses: actions/cache@v4
diff --git a/pyproject.toml b/pyproject.toml
index dd14d04e3..79fd2470c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,7 +11,7 @@ build-backend = "setuptools.build_meta"
 [tool.black]
 # target-version should be all supported versions, see
 # https://github.com/psf/black/issues/751#issuecomment-473066811
-target-version = ["py38", "py39", "py310", "py311"]
+target-version = ["py310", "py311", "py312"]
 
 
 # The default isort output conflicts with black autoformatting.
diff --git a/setup.py b/setup.py
index c2e614450..65aeb2027 100644
--- a/setup.py
+++ b/setup.py
@@ -42,7 +42,7 @@
     name="binderhub",
     version=versioneer.get_version(),
     cmdclass=versioneer.get_cmdclass(cmdclass),
-    python_requires=">=3.8",
+    python_requires=">=3.10",
     author="Project Jupyter Contributors",
     author_email="jupyter@googlegroups.com",
     license="BSD",