diff --git a/lib/prepare_release.js b/lib/prepare_release.js
index 8a6ef09e..1e5d0a2f 100644
--- a/lib/prepare_release.js
+++ b/lib/prepare_release.js
@@ -457,7 +457,8 @@ class ReleasePreparation {
         `${upstream}/${releaseBranch}`,
         proposalBranch,
         `--require-label=${notableLabels.join(',')}`,
-        `--format=${opts.format || 'markdown'}`
+        `--format=${opts.format || 'markdown'}`,
+        '--group'
       ];
     } else {
       const excludeLabels = [