diff --git a/.travis.yml b/.travis.yml
index 270b3815..cdbaf63b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,9 +4,9 @@ language: go
 
 # Versions of go that are explicitly supported by gonum.
 go:
- - 1.6.x
  - 1.7.x
  - 1.8.x
+ - 1.9.x
 
 go_import_path: gonum.org/v1/netlib
 
diff --git a/blas/netlib/dtrmvbench_test.go b/blas/netlib/dtrmvbench_test.go
index 8ef77ad6..12f99ab6 100644
--- a/blas/netlib/dtrmvbench_test.go
+++ b/blas/netlib/dtrmvbench_test.go
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build go1.7
-
 package netlib
 
 import (
diff --git a/lapack/netlib/bench_test.go b/lapack/netlib/bench_test.go
index c9ce885b..8524ac00 100644
--- a/lapack/netlib/bench_test.go
+++ b/lapack/netlib/bench_test.go
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build go1.7
-
 package netlib
 
 import (