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---
type: reference, concepts
---
# Instance-level merge request approval rules **(PREMIUM ONLY)**
> Introduced in [GitLab Premium](https://gitlab.com/gitlab-org/gitlab/issues/39060) 12.8.
Merge request approvals rules prevent users overriding certain settings on a project
level. When configured, only administrators can change these settings on a project level
if they are enabled at an instance level.
To enable merge request approval rules for an instance:
1. Navigate to **{admin}** **Admin Area >** **{push-rules}** **Push Rules** and expand **Merge
requests approvals**.
1. Set the required rule.
1. Click **Save changes**.
GitLab administrators can later override these settings in a project’s settings.
## Available rules
Merge request approval rules that can be set at an instance level are:
- **Prevent approval of merge requests by merge request author**. Prevents project
maintainers from allowing request authors to merge their own merge requests.
- **Prevent approval of merge requests by merge request committers**. Prevents project
maintainers from allowing users to approve merge requests if they have submitted
any commits to the source branch.
- **Prevent users from modifying merge request approvers list**. Prevents project
maintainers from allowing users to modify the approvers list in project settings
or in individual merge requests.
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