security sourcess.list

I just want top update security on my box. so in sources.list everything is

commented out except:    
    # Security updates
    deb http://security.debian.org stable/updates main contrib non-free
    #deb http://security.debian.org testing/updates main deb 
    #ftp://metalab.unc.edu$

Is there anything elae I might need that anyone can think of?
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