diff --git a/pyproject.toml b/pyproject.toml
index 00473ee5b1..f15f56ee25 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -60,6 +60,7 @@ dev = [
     "pytest-rerunfailures",
     "pytest-timeout",
     "ruff",
+    "sphinx<7.4.0",              # https://github.com/bluesky/ophyd-async/issues/459
     "sphinx-autobuild",
     "autodoc-pydantic",
     "sphinxcontrib-mermaid",