How to Deploy Share point 2010 visual Web parts on Share point 2013 ?

Hi All,

I have created custom web parts in Visual studio 2010(.Net framework 3.5) using Share point 2010 templates (Visual Web part) and deployed solution on Share point 2010 server. Web parts are working well on Share point 2010.

I want to deploy the same web parts on Share point  2013. Configuration details (Windows Server 2008 R2, Share point 2013 and .Net framework 4.0)

I followed below steps to deploy.

1. Copy web parts solution on new production Server

2. Right click on the project and change the URL to new share point server

3. Click on Build.

4. Build failed

Error details:

"The primary reference "Microsoft.SharePoint" could not be resolved because it has an indirect 
dependency on the .NET Framework assembly "mscorlib, Version=4.0.0.0, Culture=neutral,PublicKeyToken=b77a5c561934e089" which has a higher version "4.0.0.0" than the version "2.0.0.0" in the currenttarget framework"

Please suggest options to Deploy the 2010 Visual web parts on Share point 2013.

Thank you very much in advance.

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Ram MSBI Developer