If you have not yet seen the news, all the non-Machine Readable Passports (non-MRP) has to be renewed by 25 November 2015.
According to the notice issued by Government of India, International Civil Aviation Organisation (ICAO) has decided to get away with handwritten passports. It says, "All handwritten passports with pasted photos earlier issued by Government of India are considered non-MRP passports. All 20-year validity passports will also fall in this category."
If you have a non-MRP passport it is better to renew it sooner. It says, lot of countries may reject visa and entry into their countries, if you have non-MRP passport.
The news article below says this -- " From November 25, 2015, foreign governments may deny visa or entry to persons travelling with non-MRP passports. The Union government started issuing machine readable passports since 2001 and all new Indian passports are ICAO-compliant MRP passports."
Government of India notice -- http://passportindia.gov.in/AppOnlineProject/pdf/Public_Notice_Machine_Readable_Passports.pdf
News from TheHindu --