diff --git a/pyproject.toml b/pyproject.toml
index 4617145c..16399ce7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -73,7 +73,7 @@ optional-dependencies.dev = [
     "sphinx-lint==1.0.0",
     "sphinx-substitution-extensions==2025.2.19",
     "sphinxcontrib-spelling==8.0.1",
-    "sybil==9.0.0",
+    "sybil==9.1.0",
     "types-requests==2.32.0.20241016",
     "vulture==2.14",
     "vws-python-mock==2024.8.30",