diff --git a/pyproject.toml b/pyproject.toml
index 672c537..543e66b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -56,7 +56,7 @@ documentation = [
     "numpydoc ==1.9.0",
     "sphinx >=5.1.1",
     "sphinx-gallery ==0.19.0",
-    "sphinx-rtd-theme ==2.0.0",
+    "sphinx-rtd-theme ==3.1.0",
     "pydata-sphinx-theme ==0.14.1",
 ]