Updates to users endpoint using HTTP PUT do not work

Updates to a user account do not occur. An example is shown below:

[ryan@awesomeo assembly]$ curl -u admin:admin http://localhost:8181/auth/v1/users
{"users":[

{"userid":1,"name":"admin","description":"admin user","enabled":true,"email":"","password":"**********"}

,

{"userid":2,"name":"user","description":"user user","enabled":true,"email":"","password":"**********"}

]}
[ryan@awesomeo assembly]$ cat user.json
{
"name":"admin",
"description":"admin user account",
"enabled":"true",
"email:admin@admin.com",
"password":"foobar"
}
[ryan@awesomeo assembly]$ curl -X PUT -H "Content-Type: application/json" --data-binary @./user.json http://localhost:8181/auth/v1/users/1
[ryan@awesomeo assembly]$ curl -u admin:admin http://localhost:8181/auth/v1/users
{"users":[

{"userid":1,"name":"admin","description":"admin user","enabled":true,"email":"","password":"**********"}

,

{"userid":2,"name":"user","description":"user user","enabled":true,"email":"","password":"**********"}

]}