java + postegre connection problem in heroku

Trying to connect java to the heroku database (postgre), I have checked the url several times and have no errors. I am not using hibernate. By pgadmin I can insert into the bank normally. How to fix this error? Should I make any changes to pom.xml?

private static Connection getConnection() {
    try {
        String dbUrl = "jdbc:postgresql://ec2-54-83-27-147.compute-1.amazonaws.com:5432/d1o8bcicho5jj?user=usuario&password=senha&sslmode=require";
        return DriverManager.getConnection(dbUrl);
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return null;
}

Error:

  

java.sql.SQLException: No suitable driver found for   jdbc: postgresql: // ec2 ...

pom.xml:

<dependency>
    <groupId>postgresql</groupId>
    <artifactId>postgresql</artifactId>
    <version>9.0-801.jdbc4</version>
</dependency>