diff --git a/jupyter_scheduler/handlers.py b/jupyter_scheduler/handlers.py
index 7ae3a1ce..8e773b75 100644
--- a/jupyter_scheduler/handlers.py
+++ b/jupyter_scheduler/handlers.py
@@ -355,6 +355,7 @@ async def get(self):
 
 
 class RuntimeEnvironmentsHandler(ExtensionHandlerMixin, JobHandlersMixin, APIHandler):
+    @authenticated
     async def get(self):
         """Returns names of available runtime environments and output formats mappings"""
         try: