diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b53e8bc..f52feae 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -57,6 +57,14 @@ jobs:
           - os: ubuntu-latest
             python: "3.14"
             tox-env: py314-sphinx8-needs8
+          # Sphinx 9 with lowest compatible sphinx-needs
+          - os: ubuntu-latest
+            python: "3.12"
+            tox-env: py312-sphinx9-needs7
+          # Sphinx 9 with highest sphinx-needs
+          - os: ubuntu-latest
+            python: "3.14"
+            tox-env: py314-sphinx9-needs8
           # minimal version on Windows
           - os: windows-latest
             python: "3.14"
diff --git a/pyproject.toml b/pyproject.toml
index c854d7f..93cb917 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,7 +16,7 @@ dependencies = [
   "typer>=0.16.0",
   "click < 8.2",                # click 8.2.* produces empty errors if no args are given
   "jsonschema",
-  "sphinx>=7.4,<9",
+  "sphinx>=7.4,<10",
   "sphinx-needs>=5,<9",
   "jinja2",
   "pygments",