Well, the answer is definitely a yes. By increasing your credit limit you can increase your credit score. By its nature, credit card providers to request raise on the credit limits for your cards would reduce your credit utilization ratio, on condition that you do not increase spending lifestyles as well.
This is one of the great credit score optimization strategy to employ, in the meantime it will profit you regardless of your existing credit score. Even those with outstanding credit will see a minor upsurge in their credit score by increasing their credit limits.