diff --git a/.travis.yml b/.travis.yml
index e6260aff61866f2728e1d96d3e6529d326fcf7cc..d5f7f8ded1d008f7e73f121f08eb77cec40c7e9c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 language: go
 
 go:
-  - "1.8"
+  - "1.9"
   - "1.10.x"
 
 install:
diff --git a/Gopkg.lock b/Gopkg.lock
index 7f73dba904fdcd5e16454a8ba0278708f35d7866..e3f3fe0ce0b716549cd119cbb894dcb2448e1f4c 100644
--- a/Gopkg.lock
+++ b/Gopkg.lock
@@ -112,6 +112,6 @@
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "afa5ad0f3fc2fcf050827b85570638dc9a787498e73200b01b01432bba1b1e1c"
+  inputs-digest = "ca22621dbddb833057afb8794a9b87598a6bec5fa0db620d3368c3d235e04c3c"
   solver-name = "gps-cdcl"
   solver-version = 1
diff --git a/Gopkg.toml b/Gopkg.toml
index 3fdc280473fee5b8ab099731aaea8e57bc44dce9..e1854aa7676b219ca68fc99a1bd1e749838e6859 100644
--- a/Gopkg.toml
+++ b/Gopkg.toml
@@ -61,11 +61,6 @@
   name = "github.com/graphql-go/handler"
   version = "v0.2.1"
 
-# required for test on travis with go 1.8
-[[override]]
-  name = "github.com/spf13/viper"
-  version = "1.0.2"
-
 [prune]
   go-tests = true
   unused-packages = true