Upgrading your scripts to Unity 6
Every change from Unity 6.0 to 6.6 that makes C# code warn, fail to compile or behave differently, grouped by the release that made it. Each one links to a page with the fix and Unity's own documentation.
Unity 6.0 LTS support ends on 16 Oct 2026, in 3 days. Unity 6.3 LTS is supported until 4 Dec 2027.
Check a script for Unity 6.6Which Unity 6 version to use
Shipping a game
Unity 6.3 LTS. It is the long-term support release, with fixes until 4 Dec 2027. Move off 6.0 LTS before its support ends.
Starting something new
Unity 6.6, the newest release. Update releases are supported only until the next one ships, so plan to keep upgrading or to settle on 6.7 LTS.
Planning ahead
6.7 is planned as the next LTS and the last release on Mono. 6.8 is planned to bring the CoreCLR Editor and C# 14. Code that avoids obsolete APIs now has less to change then.
Every change, release by release
- Unity 6.0 LTS Released 17 Oct 2024 · support until 16 Oct 2026
First Unity 6 release. Render graph becomes the URP default; Rigidbody velocity and drag renamed; FindObjectOfType obsolete.
- Rigidbody.velocity is obsolete in Unity 6: use linearVelocity Physics
- Rigidbody.drag is obsolete in Unity 6: use linearDamping Physics
- FindObjectOfType is obsolete: use FindFirstObjectByType or FindAnyObjectByType Scripting
- FindObjectsOfType is obsolete: use FindObjectsByType Scripting
- PhysicMaterial is now PhysicsMaterial in Unity 6 Physics
- URP ScriptableRenderPass.Execute does not run in Unity 6: write RecordRenderGraph Rendering
- UI Toolkit ExecuteDefaultAction is obsolete: use HandleEventBubbleUp UI Toolkit
- LightingSettings.filteringGaussRadius is obsolete in Unity 6 Lighting
- InvalidOperationException: You are trying to read Input using the UnityEngine.Input class Input
- Unity 6.1 Support ended Released 23 Apr 2025 · support ended 12 Aug 2025
Update release.
- Unity 6.2 Support ended Released 12 Aug 2025 · support ended 4 Dec 2025
URP SetupRenderPasses deprecated; AfterRendering now runs after the final blit; VisualElement.transform deprecated.
- Unity 6.3 LTS Released 4 Dec 2025 · support until 4 Dec 2027
Current LTS. The safe target for shipping projects.
- Unity 6.4 Support ended Released 18 Mar 2026 · support ended 17 Jun 2026
ECS and Project Auditor built into the Editor.
- Unity 6.5 Support ended Released 15 Jun 2026 · support ended 31 Aug 2026
Built-in Render Pipeline deprecated; FindObjectsSortMode overloads deprecated; old ModelImporter APIs removed.
- Unity 6.6 Supported Released 31 Aug 2026
Dynamic batching obsolete; UxmlFactory and UxmlTraits removed; UNITY_64 and DEVELOPMENT_BUILD defines deprecated; Cinemachine 3 by default.
- Unity 6.7 Planned
Planned LTS and the last release built on Mono. The Input System is planned to become built in. Built-in Render Pipeline supported through its LTS lifecycle.
- Unity 6.8 Planned
Planned: CoreCLR Editor, a non-experimental CoreCLR player, and C# 14.
Sources
Release dates and support windows come from endoflife.date and Unity's announcements; the changes come from Unity's upgrade guides for each release and its planned breaking changes post. Each change page links the exact documentation it is based on. Last checked 2026-10-05.