diff --git a/artifacts/flagger/crd.yaml b/artifacts/flagger/crd.yaml
index 4e1d7f91d..dbcce56d4 100644
--- a/artifacts/flagger/crd.yaml
+++ b/artifacts/flagger/crd.yaml
@@ -855,9 +855,6 @@ spec:
                                 - MUTUAL
                                 - ISTIO_MUTUAL
                               type: string
-                            warmupDurationSecs:
-                              description: Grace time to receive complete request
-                              type: string
                             privateKey:
                               description: REQUIRED if mode is `MUTUAL`.
                               format: string