diff --git a/capsulflask/db_model.py b/capsulflask/db_model.py
index 46101da..ac3eaee 100644
--- a/capsulflask/db_model.py
+++ b/capsulflask/db_model.py
@@ -13,7 +13,7 @@ class DBModel:
   def __init__(self, connection, cursor):
     self.connection = connection
     self.cursor = cursor
-    self.cursor.execute("SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;")
+    #self.cursor.execute("SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;")
 
 
   #     ------    LOGIN     ---------     
@@ -362,7 +362,7 @@ class DBModel:
     # have to make a new cursor to set isolation level
     # cursor = self.connection.cursor()
     self.cursor.execute("""
-      BEGIN TRANSACTION;
+      BEGIN TRANSACTION ISOLATION LEVEL SERIALIZABLE;
       UPDATE host_operation SET assignment_status = 'assigned' 
         WHERE host = %s AND operation = %s AND operation != (
           SELECT COALESCE(