How to update working branch from latest merge in master

[abhinandan]

I have master branch I have created one branch from master and made some changes and commited it and created pull request (but it is not yet merged to master branch) meanwhile I have created another branch from master and made some changes into that and meanwhile last pull request got merged to master branch now I want to update my current working branch with master before commiting  without loosing my changes in current branch.

How I can achieve this ?

Thanks in Advance