diff --git a/pyproject.toml b/pyproject.toml
index 68ae0060cd..12750e0a6b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -89,7 +89,7 @@ doc = [
     "recommonmark",
     "rtds-action",
     "sphinx >=4",
-    "sphinx-rtd-theme",
+    "sphinx-rtd-theme >=1",
 ]
 
 [project.scripts]