diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index c7c16ec6..a37f1645 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -17,7 +17,7 @@ jobs:
       matrix:
         os: [Ubuntu]
         python-version: ["3.10", "3.11"]
-        sphinx-version: ["sphinx<7", "sphinx<8"]
+        sphinx-version: ["sphinx<7", "sphinx<8", "sphinx<9"]
     defaults:
       run:
         shell: bash -eo pipefail {0}