diff --git a/docs/appendices/0.30.0-migration-guide.md b/docs/appendices/0.30.0-migration-guide.md
index a41b46037..060c1e651 100644
--- a/docs/appendices/0.30.0-migration-guide.md
+++ b/docs/appendices/0.30.0-migration-guide.md
@@ -4,3 +4,4 @@
 
 - Support for [SPDY](https://en.wikipedia.org/wiki/SPDY) has been removed. No major browser supports it as of 2021. Custom `nginx.conf.sigil` templates referencing spdy-related variables will continue to build until the 1.0.0 release.
 - Support for the `DOKKU_SCALE` file - deprecated in 0.25.0 - has been removed in favor of the `formations` key in the `app.json` file. Please see the [process management documentation](/docs/processes/process-management.md#manually-managing-process-scaling) for more information on how to use the `formation` key of the `app.json` file.
+- The deprecated `--detach` global flag for `dokku run` was removed. Please see the [one-off tasks documentation](/docs/processes/one-off-tasks.md#running-a-detached-container) for more information on running detached containers.
diff --git a/docs/configuration/environment-variables.md b/docs/configuration/environment-variables.md
index 002cc3120..c4498062f 100644
--- a/docs/configuration/environment-variables.md
+++ b/docs/configuration/environment-variables.md
@@ -92,7 +92,6 @@ The following config variables have special meanings and can be set in a variety
 | `DOKKU_APP_NAME`               | none                            | `--app APP` flag                                                                                                                                 | Name of application to work on. Respected by core plugins. |
 | `DOKKU_APPS_FORCE_DELETE`      | none                            | `--force` flag                                                                                                                                   | Whether to force delete an application. Also used by other plugins for destructive actions. |
 | `DOKKU_CHECKS_URL`             | `https://dokku.com/docs/deployment/zero-downtime-deploys/` | `/etc/environment` <br /> `~dokku/.dokkurc` <br /> `~dokku/.dokkurc/*`                                                | Url displayed during deployment when no CHECKS file exists. |
-| `DOKKU_DETACH_CONTAINER`       | none                            | `--detach` flag                                                                                                                                  | Deprecated: Whether to detach a container started via `dokku run`. |
 | `DOKKU_QUIET_OUTPUT`           | none                            | `--quiet` flag                                                                                                                                   | Silences certain header output for `dokku` commands. |
 | `DOKKU_RM_CONTAINER`           | none                            | `dokku config:set` <br />                                                                                                                        | Deprecated: Whether to keep `dokku run` containers around or not. |
 | `DOKKU_TRACE`                  | none                            | `dokku trace:on`   <br /> `dokku trace:off` <br /> `--trace` flag                                                                                | Turn on very verbose debugging. |
diff --git a/plugins/common/functions b/plugins/common/functions
index fb1232b86..749f968e7 100755
--- a/plugins/common/functions
+++ b/plugins/common/functions
@@ -427,10 +427,6 @@ parse_args() {
       --quiet)
         export DOKKU_QUIET_OUTPUT=1
         ;;
-      --detach)
-        dokku_log_warn_quiet "Deprecated: use run:detached instead of using the --detach flag"
-        export DOKKU_DETACH_CONTAINER=1
-        ;;
       --trace)
         export DOKKU_TRACE=1
         ;;