Rails Application Configuration #allow_concurrency attribute allow_concurrency Ruby on Rails 6.0.6.1 Since v3.0.20 Available in: v3.0.20 v3.1.12 v3.2.22.5 v4.0.13 v4.1.16 v4.2.11.3 v5.0.7.2 v5.1.7 v5.2.8.1 v6.0.6.1 v6.1.7.10 v7.0.10 v7.1.6 v7.2.3.2 v8.0.5.1 v8.1.3.1 edge Compare with: (choosing a version navigates to the comparison) Choose a version v3.0.20 · same v3.1.12 · same v3.2.22.5 · same v4.0.13 · same v4.1.16 · same v4.2.11.3 · same v5.0.7.2 · same v5.1.7 · same v5.2.8.1 · same v6.1.7.10 · same v7.0.10 · same v7.1.6 · same v7.2.3.2 · same v8.0.5.1 · same v8.1.3.1 · same edge · same No documentation comment. On this page Support Bug Reports can be filed for the Ruby on Rails project on GitHub. Feature requests should be discussed on the rubyonrails-core forum. License Released under the MIT license.