diff --git a/ml_services_validation_19-05/src/api/requirements.txt b/ml_services_validation_19-05/src/api/requirements.txt
index a08c994..45a2566 100644
--- a/ml_services_validation_19-05/src/api/requirements.txt
+++ b/ml_services_validation_19-05/src/api/requirements.txt
@@ -5,4 +5,4 @@ h5py
 tensorflow
 flama[full]
 uvicorn
-marshmallow==3.0.0rc5
+marshmallow==3.26.2