diff --git a/pyproject.toml b/pyproject.toml
index 3d810fff7..80657f662 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -53,7 +53,7 @@ docs = [
   "pybtex",
   "pydata-sphinx-theme>=0.12",
   "setuptools>=61.0.0",
-  "sphinx>=5.3.0",
+  "sphinx>=5.3.0,<7.4",
   "sphinx-copybutton>=0.4.0",
   "sphinx-favicon>=1.0.1",
   "sphinx_design>=0.3.0",