Starting in November 2014, SHA-1 will be gradually sunset by Google. Thus, we strongly suggest that anyone using SSL certificates signed with SHA-1 reissue their certificates from respective account panel as soon as possible.
The reason is that the SHA-1 hashing algorithm is being deprecated by most Certificate Authorities.
If you are not sure whether your SSL certificate is signed by SHA-1 or SHA-2, you can use this helpful checker to find out.
