diff --git a/pyproject.toml b/pyproject.toml
index 6fdc8b4..995a4f1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,7 +14,7 @@ httpx = ">=0.23,<0.28.2"
 pydantic = ">=1.8.2,<3.0.0"
 python = "^3.9"
 semver = ">=2.13,<4.0"
-sphinx-rtd-theme = {version = ">=0.5.1,<2.1.0", optional = true}
+sphinx-rtd-theme = {version = ">=0.5.1,<3.2.0", optional = true}
 typing-extensions = ">=3.10,<5.0"
 xmltodict = ">=0.12,<1.1"