Recently I’ve been working extensively with Ribbon. So what I did, I developed a ribbon and attached the ribbon to a feature. Then after modifying the ribbon in Visual Studio I deployed the ribbon again to see the changes. But interestingly the modification was not working. The ribbon was deployed successfully for the first time. But later I updated the ribbon xml in Visual studio and redeployed and the update to the ribbon was not showing in the site though the deployment was successful. Event I tried to deactivate/activate the ribbon feature but no luck. So the problem was ribbon update was not showing in effect in the site event after successful deployment.
Finally I found the solution from Sandrino Di Mattia’s post here. Basically, You need to modify the feature version every time you modify the ribbon and redeploy. First find which feature the ribbon is associated with. Then open the feature properties window and modify the feature version as shown below:
Figure 1: Change Feature Version
Another solution might be to clear your browser cache.
So changing the feature version or clearing the browser cache or private browsing might be solution for getting ribbon update in browser.