Session token is not changing even after logout.

[kamal13597]

Here is how i implemented in a sinatra application:

redis_options = {
host: hostname,
port: port,
password: password,
db: 1,
ssl: true
}

use Rack::Session::Redis, redis_server: redis_options, expire_after: 86400

But the token, it's generation is same even after the logout for a user. This seems to me a security threat. Can please help me if missing on any configuration part.