diff --git a/pyproject.toml b/pyproject.toml
index 015b50a..9359a5c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,7 +26,7 @@ dependencies = [
     "dtoolcore>=3.18.0",
     "flask-jwt-extended[asymmetric_crypto]>=4.6.0",
     "pyyaml",
-    "marshmallow<4.0.0"
+    "marshmallow<5.0.0"
 ]
 
 [project.optional-dependencies]