diff --git a/install/v3/install.md b/install/v3/install.md
index d948c5c..3e54382 100644
--- a/install/v3/install.md
+++ b/install/v3/install.md
@@ -23,6 +23,7 @@ Kuboard v3.x 支持 Kubernetes 多集群管理。如果您从 Kuboard v1.0.x 或
 
 | Kubernetes 版本 | Kuboard 版本   | 兼容性 | 说明                                                         |
 | --------------- | -------------- | ------ | ------------------------------------------------------------ |
+| v1.21           | v3.x | <span style="font-size: 24px;">😄</span>      | 已验证                            |
 | v1.20           | v3.x | <span style="font-size: 24px;">😄</span>      | 已验证                            |
 | v1.19           | v3.x | <span style="font-size: 24px;">😄</span>      | 已验证                            |
 | v1.18           | v3.x | <span style="font-size: 24px;">😄</span>      | 已验证                            |