Spring boot feign client is not decrypting cipher value

I have a Spring Boot Application where in application.yml file I have below property

password: '{cipher}hdjfhjksdkfhsdfhfsdjfhshfh'

I am using this property in feign client as. -

@FeignClient(name = "employee-client", url = "${employee.url}"    ,
    configuration = EmployeeFeignConfiguration.class)
 public interface EmployeeClient {

@GetMapping(value = "/employee", headers = {"password=${employee.password}",
        "accept=application/json"}, produces=APPLICATION_JSON_VALUE)
List<EmployeeResponse> employees(@RequestParam("emplIds") List<String> emplIds);
}

I have also configured ENCRYPT_KEY in bootstrap.yml file.

But in feign client header, password is always cipher value and not decrypted one, see below log

[EmployeeClient#employees] password: hdjfhjksdkfhsdfhfsdjfhshfh

I am not sure what I am doing wrong here.