diff --git a/pyproject.toml b/pyproject.toml
index 019ff81..5cc16c9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -54,7 +54,7 @@ docs = [
     "sphinxcontrib-napoleon",
     "sphinxcontrib-jquery",
     "sphinx-argparse",
-    "sphinx_rtd_theme",
+    "sphinx_rtd_theme>=1.0.0",
     "numpydoc",
     "sphinx-copybutton",
 ]