diff --git a/.travis.yml b/.travis.yml
index a085821..cc7ad5b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,6 @@
 language: go
 go:
-- 1.12.5
+- 1.13.x
 env:
   global:
   - GO111MODULE=on
diff --git a/README.md b/README.md
index 282a117..36590aa 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 go-iap
 ======
 
-![](https://img.shields.io/badge/golang-1.12-blue.svg?style=flat)
+![](https://img.shields.io/badge/golang-1.13-blue.svg?style=flat)
 [![Build Status](https://travis-ci.org/awa/go-iap.svg?branch=master)](https://travis-ci.org/awa/go-iap)
 [![codecov.io](https://codecov.io/github/awa/go-iap/coverage.svg?branch=master)](https://codecov.io/github/awa/go-iap?branch=master)