cast const Class using dynamic_cast

I want to cast this:

class Base 
{
public:
    virtual ~Base(){};
};
class Der : public Base {};

int main()
{
    const Base* base = new Der;
    Der* der = dynamic_cast<Der*>(base); // Error

    return 0;
}

What should I do? I tried to put: const Der* der = dynamic_cast<Der*>(base); to mantain the const but this doesn't work.