diff --git a/pyproject.toml b/pyproject.toml
index ccc6349..557f27a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -42,7 +42,7 @@ dependencies = [
     "ruff==0.15.0",
     "aiohttp==3.13.3",
     "prometheus-client==0.24.1",
-    "mashumaro==3.19",
+    "mashumaro==3.20",
     "mkdocs-material==9.7.1",
     "mkdocstrings[python]==1.0.3",
 ]