diff --git a/moto/ec2/responses/instances.py b/moto/ec2/responses/instances.py
index 9f6c188ec..84948b326 100644
--- a/moto/ec2/responses/instances.py
+++ b/moto/ec2/responses/instances.py
@@ -304,7 +304,7 @@ EC2_RUN_INSTANCES = """<RunInstancesResponse xmlns="http://ec2.amazonaws.com/doc
   </instancesSet>
   </RunInstancesResponse>"""
 
-EC2_DESCRIBE_INSTANCES = """<DescribeInstancesResponse xmlns='http://ec2.amazonaws.com/doc/2012-12-01/'>
+EC2_DESCRIBE_INSTANCES = """<DescribeInstancesResponse xmlns="http://ec2.amazonaws.com/doc/2013-10-15/">
   <requestId>fdcdcab1-ae5c-489e-9c33-4637c5dda355</requestId>
       <reservationSet>
         {% for reservation in reservations %}