diff --git a/pyproject.toml b/pyproject.toml
index ea62eb8..d215d14 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,6 +37,7 @@ tests = [
 ]
 docs = [
     "pydata-sphinx-theme==0.13.3",
+    "sphinx==7.1.2",
     "sphinx_copybutton==0.5.2",
     "sphinx-notfound-page==0.8.3",
 ]