diff --git a/.pullapprove.yml b/.pullapprove.yml
index d9572bde..49cb34b5 100644
--- a/.pullapprove.yml
+++ b/.pullapprove.yml
@@ -3,6 +3,8 @@ approve_regex: ^LGTM
 reject_regex: ^Rejected
 reset_on_push: true
 author_approval: ignored
+signed_off_by:
+  required: true
 reviewers:
   teams:
   - runtime-spec-maintainers