You need to write something like:
<configuration>
<runtime>
<assemblybinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentassembly>
<assemblyidentity name="myAssembly">
publicKeyToken="32ab4ba45e0a69a1"
culture="neutral" />
<bindingredirect oldversion="1.0.0.0">
newVersion="2.0.0.0"/>
<codebase version="2.0.0.0">
href="http://www.litwareinc.com/myAssembly.dll"/>
</codebase></bindingredirect></assemblyidentity></dependentassembly>
</assemblybinding>
</runtime>
</configuration>
For more information visit:
http://msdn.microsoft.com/en-us/library/twy1dw1e.aspx