diff --git a/.travis.yml b/.travis.yml
index 85a6d49..e9f1f0c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,5 @@
 language: go
 go:
-- 1.8.3
 - 1.9
 install:
 - go get -u github.com/coreos/etcd/clientv3
diff --git a/README.md b/README.md
index 2a943a8..6d057fd 100644
--- a/README.md
+++ b/README.md
@@ -59,7 +59,7 @@ The goal of this project is to make it much easier to manage jobs on lots of mac
 
 Install from binary [releases](https://github.com/shunfei/cronsun/releases), download and unzip.
 
-Or build from source, require `go >= 1.7+`
+Or build from source, require `go >= 1.9+`
 
 ```
 go get -u github.com/shunfei/cronsun
diff --git a/README_ZH.md b/README_ZH.md
index 2ac9bbb..5170264 100644
--- a/README_ZH.md
+++ b/README_ZH.md
@@ -53,7 +53,7 @@
 
 直接下载执行文件 [releases](https://github.com/shunfei/cronsun/releases)，解压后即可运行。
 
-如果你熟悉 `Go`，也可以从源码编译, 要求 `go >= 1.7+`
+如果你熟悉 `Go`，也可以从源码编译, 要求 `go >= 1.9+`
 
 ```
 go get -u github.com/shunfei/cronsun