diff --git a/pyproject.toml b/pyproject.toml
index d7b3a09..803a71f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,7 +41,7 @@ dev = [
     "flake8==6.1.0",
     "flit==3.9.0",
     "mypy==1.9.0",
-    "sphinx==5.1.1",
+    "sphinx==7.3.6",
     "ufmt==2.5.1",
     "usort==1.0.7",
 ]