Shortlisted agencies will be required to submit a strategic plan for the site including project weighting, timescales and budgets.
The project will include hosting, interface, design, information architecture, data integration, content management system, content upload and reporting.
The tourism provides information on things to see and do, places to eat and drink, and where to stay in Birmingham. It also offers information on travelling in and around the city and online bookings for hotels, restaurants and events.
It is aimed at anyone looking for information on Birmingham, including leisure and business tourists and residents looking for things to do in the city.
The brief will also include refreshing the design of the corporate , to include structure updates and construction of a content management system.
Agencies will also need to provide proposals on the application of Web 2.0 technologies to both sites.
Dave Hodgson, marketing director at Marketing Birmingham, said: "We must ensure that for anyone considering a holiday or planning a business trip, Birmingham is easy to find online and the site must be easy to navigate, with a wealth of valuable and up to date information, as well as a look that engages people and makes them want to find out more."