This is a special update, sponsored by several people, so it mainly contains only their suggestions:

• added new functionality to the generator tablet and terminal
• added 2 new doors
• weapons from SCP: SL are back
• started to fix server-side compatibility issues

• added many new decorations
• improved 3D models and textures for some blocks
• added Emergency Release Button from SCP: Secret Laboratory game
• added Panic Button
• buttons now can be configured also by Programming Device
• now you can view some button data using Chaos Insurgency Hacking Device
• turned off lamps can now be controlled by redstone signal
• Particle Disruptor is back
• text formatting mechanics added
• added some structures
• fixed some bugs

Congratulations! The mod has been ported to the 1.21.1 version of Minecraft!

• the build may contain some bugs that may be fixed later
• the build has some small additional changes

• added many new decorations
• improved 3D models and textures for some blocks
• added Emergency Release Button from SCP: Secret Laboratory game
• added Panic Button
• buttons now can be configured also by Programming Device
• now you can view some button data using Chaos Insurgency Hacking Device
• turned off lamps can now be controlled by redstone signal
• fixed some bugs

Full changelog:

• it has become possible to create custom access tags for keycards, buttons and some blocks
• functional rework of doors
• added 2 variations of the door with the same model and texture, but with different animations - Class D Cell Door and Elevator Door
• added reinforced door from SCP: Secret Laboratory game
• added 4 new doors from SCP: Containment Breach game
• added Blast Doors (7x3) from SCP: Containment Breach game
• all doors now have smoother animations
• new decorations added
• improved textures of some blocks
• Metal Walls D now also have horizontal rotation
• functional rework of the generator
• visual rework of the generator and electrobox
• Metal Workbench rework
• added some building blocks
• added many new crafts
• added some structures
• updated icons for SCP ability items
• reorganized creative inventory
• additions and changes in the admin panel
• creative inventory has been cleared of many non-standard blocks
• fixed some bugs

Changes after snapshots:

• it has become possible to create custom access tags for some blocks
• added 2 variations of the door with the same model and texture, but with different animations - Class D Cell Door and Elevator Door
• added reinforced door from SCP: Secret Laboratory game
• added 4 new doors from SCP: Containment Breach game
• some decorations added
• added some structures
• Metal Workbench rework is completed
• added new SCP-096 ability
• some changes in the admin panel
• added switching by tools to some blocks
• fixed some bugs