diff --git a/model_data/simulation_system/core/DataLoader.py b/model_data/simulation_system/core/DataLoader.py
index 9cf1c2f2..428e1d7f 100644
--- a/model_data/simulation_system/core/DataLoader.py
+++ b/model_data/simulation_system/core/DataLoader.py
@@ -110,7 +110,7 @@ def dataloader_factory(runtime_environment: str | None = None) -> DataLoader:
     dataloader_types = {
         "local": LocalDataLoader(),
         "local-mock": S3MockDataLoader(),
-        "dev": S3MockDataLoader(),
+        "dev": S3DataLoader(),
         "staging": S3DataLoader(),
         "prod": S3DataLoader(),
     }