diff --git a/.travis.yml b/.travis.yml
index d654c44..22a9880 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,6 @@
 language: go
 go:
-  - tip
-  - 1.5
+- 1.8
 
 script:
   # test
diff --git a/Makefile b/Makefile
index bf704c1..985ffca 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,6 @@
 get-dev:
 	go get -u golang.org/x/tools/cmd/benchcmp
 	go get -u golang.org/x/tools/cmd/stringer
-	go get -u github.com/golang/lint/golint
 	go get -u github.com/ajstarks/svgo/benchviz
 	go get -t github.com/c9s/c6/...
 
@@ -23,9 +22,6 @@ gofmt:
 	#TODO: This should fail if any file is changed.
 	go fmt github.com/c9s/c6/...
 
-lint:
-	golint github.com/c9s/c6/...
-
 cover:
 	go test -cover -coverprofile c6.cov -coverpkg github.com/c9s/c6/ast,github.com/c9s/c6/runtime,github.com/c9s/c6/parser,github.com/c9s/c6/compiler github.com/c9s/c6/compiler