diff --git a/pyproject.toml b/pyproject.toml
index d04420af5..f0b5ab203 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -76,7 +76,7 @@ docs = [
   "jupytext",
   "jupyter-book>=0.15.1,<1.1",
   "plotly",
-  "Sphinx==7.3.7"
+  "Sphinx==8.0.2"
 ]
 full = [
   "gplugins[devsim,femwell,gmsh,meow,sax,schematic,tidy3d,vlsir]"