Security
Demo Update
Greetings, security officers. We’ve reviewed reports from recent shifts and made several adjustments to checkpoint procedures. Thank you for helping us identify inconsistencies in the facility’s operations. Please, make…
Steam
Security 51
Also known as Security 51, s5, security 51
You're a security officer deep within Area 51. Scan the staff, verify clearances, and decide who can enter the elevator and who absolutely mustn't leave. The deeper you go, the less certain you are that anyone standing before you is still human.
Last update
22 Jun 2026
Original sources
1
Latest update
Latest updates
Update history
Browse past updates and patch notes for this game.
- June 2026
- If you haven’t tried the Security 51 demo yet, now is the perfect time to start your shift. We’ve added lots of new content since the playtest, including reworked shifts, infection tracking, new events, and much more. G…Security
- Dear agents, A few weeks ago, thousands of you joined the Security 51 playtest and stepped into your first shifts deep beneath Area 51. Since then, we’ve been carefully reviewing your reports, discussions and feedback.…Security
- Our first Security 51 playtest is over. Guarding the top-secret military object is no joke - and we thank you all for your hard work! Playtest stats: 7,000 unique players have joined the playtest. No blind spots in our…Security
- May 2026
- We have released a playtest update that includes balance changes and fixes for critical bugs. Important: with this update, old saves may become corrupted, which will significantly affect gameplay. We recommend starting…Security
- Dear agents, Security 51 is a simulator of an Area 51 security officer. Guard the elevator decending from the surface into the endless depths of the underground laboratories. Only you decide who goes in and who gets to…Security
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