GitHub's Security Bug Bounty program marked its fourth anniversary with significant growth in 2017, evidenced by an increase in both the number of resolved reports and total payouts, which rose to $166,495 from $95,300 in the previous year. The program, which expanded to include GitHub Enterprise in its scope, saw a boost in valid report rates from 6% to nearly 15%, attributed partly to re-evaluated payout structures and initiatives like private bug bounties and researcher grants. These initiatives aimed to engage researchers more effectively, particularly in areas of critical enterprise authentication. Operational efficiencies improved with the integration of chat-based workflows and APIs, reducing average response times to 10 hours and expediting the process of rewarding bounties. Looking forward to 2018, GitHub plans to further enhance the program by expanding private bounties and research grants, and exploring ways to secure its services while maintaining researcher engagement.