diff --git a/pyproject.toml b/pyproject.toml
index cc536a7..534e9ae 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -64,7 +64,7 @@ pytest-xdist = "^3.6.1"
 
 [tool.poetry.group.docs.dependencies]
 Sphinx = "^8.0.0"
-pydata-sphinx-theme = "^0.17.0"
+pydata-sphinx-theme = "^0.21.0"
 myst-parser = "^4.0.0"
 jupyter = "^1.0.0"
 seaborn = "^0.13.0"