diff --git a/.github/workflows/deploy-preview.yml b/.github/workflows/deploy-preview.yml
index 1711bfc..06521c5 100644
--- a/.github/workflows/deploy-preview.yml
+++ b/.github/workflows/deploy-preview.yml
@@ -14,6 +14,10 @@ on:
       # context-resolution bug reached every repository.
       - '.github/workflows/deploy-preview.yml'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
+
 permissions: {}
 
 jobs:
diff --git a/.github/workflows/repository-hygiene.yml b/.github/workflows/repository-hygiene.yml
index 537c669..89aa861 100644
--- a/.github/workflows/repository-hygiene.yml
+++ b/.github/workflows/repository-hygiene.yml
@@ -3,6 +3,10 @@ name: 'Repository Hygiene'
 'on':
   pull_request:
 
+'concurrency':
+  'group': '${{ github.workflow }}-${{ github.ref }}'
+  'cancel-in-progress': '${{ github.ref != ''refs/heads/main'' }}'
+
 permissions:
   contents: 'read'
   pull-requests: 'read'