diff --git a/pyproject.toml b/pyproject.toml
index 95a3bce84..8bd4ef0d0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -80,7 +80,7 @@ dev = [
 docs = [
     "sphinx >=7.0.0,<8.0.0",
     "sphinx-autodoc-typehints >=2.0.0,<3.0.0",
-    "sphinx-rtd-theme >=2.0.0,<3.0.0",
+    "sphinx-rtd-theme >=2.0.0,<4.0.0",
     "numpydoc >=1.5.0,<2.0.0",
     "sphinx_tabs >=3.4.1,<4.0.0",
     "sphinx-togglebutton >=0.3.2,<1.0.0",