[git] Point branch to new commit

Question

(This question is the opposite of this one)

How can I go from this

dev            C - D
             /
master A - B 

to this?

dev                D
                 /
master A - B - C 

I know I'm going to kick myself when I see the answer, but for the moment I'm a bit stuck...

Answer 1

git checkout master
git merge C

                 D (dev)
                /
master A - B - C (move master HEAD)

(with C being the SHA1 of comit C)

It should be a fast-forward merge.