diff --git a/docs/drivers/rackspace.md b/docs/drivers/rackspace.md
index a02958dc37..3e802d5186 100644
--- a/docs/drivers/rackspace.md
+++ b/docs/drivers/rackspace.md
@@ -18,13 +18,13 @@ Options:
 -   `--rackspace-api-key`: **required** Rackspace API key.
 -   `--rackspace-region`: **required** Rackspace region name.
 -   `--rackspace-endpoint-type`: Rackspace endpoint type (`adminURL`, `internalURL` or the default `publicURL`).
--   `--rackspace-image-id`: Rackspace image ID. Default: Ubuntu 14.10 (Utopic Unicorn) (PVHVM).
+-   `--rackspace-image-id`: Rackspace image ID. Default: Ubuntu 15.10 (Wily Werewolf) (PVHVM).
 -   `--rackspace-flavor-id`: Rackspace flavor ID. Default: General Purpose 1GB.
 -   `--rackspace-ssh-user`: SSH user for the newly booted machine.
 -   `--rackspace-ssh-port`: SSH port for the newly booted machine.
 -   `--rackspace-docker-install`: Set if Docker has to be installed on the machine.
 
-The Rackspace driver will use `598a4282-f14b-4e50-af4c-b3e52749d9f9` (Ubuntu 14.04 LTS) by default.
+The Rackspace driver will use `59a3fadd-93e7-4674-886a-64883e17115f` (Ubuntu 15.10) by default.
 
 Environment variables and default values:
 
@@ -34,7 +34,7 @@ Environment variables and default values:
 | **`--rackspace-api-key`**    | `OS_API_KEY`         | -                                      |
 | **`--rackspace-region`**     | `OS_REGION_NAME`     | -                                      |
 | `--rackspace-endpoint-type`  | `OS_ENDPOINT_TYPE`   | `publicURL`                            |
-| `--rackspace-image-id`       | -                    | `598a4282-f14b-4e50-af4c-b3e52749d9f9` |
+| `--rackspace-image-id`       | -                    | `59a3fadd-93e7-4674-886a-64883e17115f` |
 | `--rackspace-flavor-id`      | `OS_FLAVOR_ID`       | `general1-1`                           |
 | `--rackspace-ssh-user`       | -                    | `root`                                 |
 | `--rackspace-ssh-port`       | -                    | `22`                                   |
diff --git a/drivers/rackspace/rackspace.go b/drivers/rackspace/rackspace.go
index f1c0dd6102..0fc75f6862 100644
--- a/drivers/rackspace/rackspace.go
+++ b/drivers/rackspace/rackspace.go
@@ -136,10 +136,10 @@ func (d *Driver) SetConfigFromFlags(flags drivers.DriverOptions) error {
 	}
 
 	if d.ImageId == "" {
-		// Default to the Ubuntu 14.04 image.
+		// Default to the Ubuntu 15.10 image.
 		// This is done here, rather than in the option registration, to keep the default value
 		// from making "machine create --help" ugly.
-		d.ImageId = "598a4282-f14b-4e50-af4c-b3e52749d9f9"
+		d.ImageId = "59a3fadd-93e7-4674-886a-64883e17115f"
 	}
 
 	if d.EndpointType != "publicURL" && d.EndpointType != "adminURL" && d.EndpointType != "internalURL" {