diff --git a/build.sh b/build.sh
index 03b95ef..7785227 100755
--- a/build.sh
+++ b/build.sh
@@ -8,8 +8,8 @@ MAKESELF_INSTALL_DIR=$(mktemp -d makeself.XXXXXX)
 
 check_version(){
     if [ -z "${VERSION}" ]; then
-        warn "kubernetes version not specified, use default version 1.20.2."
-        VERSION="1.21.0"
+        warn "kubernetes version not specified, use default version 1.21.1."
+        VERSION="1.21.1"
     fi
     IMAGE_LIST=$(kubeadm config images list --kubernetes-version v${VERSION})
 }