diff --git a/pyproject.toml b/pyproject.toml
index 3330ef6..af21801 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -50,7 +50,7 @@ tests = [
   "coverage==7.6.10",
   "werkzeug==3.1.3",
   "flask==3.1.0",
-  "marshmallow==3.23.2",
+  "marshmallow==3.23.3",
   "webargs==8.6.0",
   "apispec==6.8.0",
   "PyYAML==6.0.2",