diff --git a/pyproject.toml b/pyproject.toml
index d623d796..79bf6ee6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -72,7 +72,7 @@ optional-dependencies.dev = [
     "sphinx-copybutton==0.5.2",
     "sphinx-lint==1.0.0",
     "sphinx-pyproject==0.3.0",
-    "sphinx-substitution-extensions==2025.2.19",
+    "sphinx-substitution-extensions==2025.3.3",
     "sphinxcontrib-spelling==8.0.1",
     "sybil==9.1.0",
     "types-requests==2.32.0.20250301",