MATLAB: Yosemite and matlab 2013a

MATLABmatlab2013ayosemite

Hello ,
Yesterday I downloaded Yosemite on my MacBook Pro , I tried to open matlab 2013a and it worked good on my mac but today i open it and it gave me * | You can’t use this version of the application “MATLAB_R2013a” with this version of OS X. | *
so, what should i do to make it work again ??
regards
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