diff --git a/.gitignore b/.gitignore
index daf913b..f70f99c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -22,3 +22,6 @@ _testmain.go
 *.exe
 *.test
 *.prof
+
+# vendor
+/vendor
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
index d4de194..dc6d93f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,9 +5,11 @@ branches:
     - master
 
 go:
-  - 1.5.4
-  - 1.6.3
-  - 1.7.3
+  - 1.5.x
+  - 1.6.x
+  - 1.7.x
+  - 1.8.x
+  - 1.9.x
   - tip
 
 env:
diff --git a/Gopkg.lock b/Gopkg.lock
new file mode 100644
index 0000000..582ab62
--- /dev/null
+++ b/Gopkg.lock
@@ -0,0 +1,39 @@
+# This file is autogenerated, do not edit; changes may be undone by the next 'dep ensure'.
+
+
+[[projects]]
+  name = "github.com/davecgh/go-spew"
+  packages = ["spew"]
+  revision = "346938d642f2ec3594ed81d874461961cd0faa76"
+  version = "v1.1.0"
+
+[[projects]]
+  name = "github.com/pkg/errors"
+  packages = ["."]
+  revision = "645ef00459ed84a119197bfb8d8205042c6df63d"
+  version = "v0.8.0"
+
+[[projects]]
+  name = "github.com/pmezard/go-difflib"
+  packages = ["difflib"]
+  revision = "792786c7400a136282c1664665ae0a8db921c6c2"
+  version = "v1.0.0"
+
+[[projects]]
+  name = "github.com/stretchr/testify"
+  packages = ["assert"]
+  revision = "69483b4bd14f5845b5a1e55bca19e954e827f1d0"
+  version = "v1.1.4"
+
+[[projects]]
+  branch = "master"
+  name = "github.com/xtgo/set"
+  packages = ["."]
+  revision = "4431f6b51265b1e0b76af4dafc09d6f12c2bdcd0"
+
+[solve-meta]
+  analyzer-name = "dep"
+  analyzer-version = 1
+  inputs-digest = "e010eb1269d6f582c0c9b306d2506a5bcfd99464e64a0f21c9be12478b262b37"
+  solver-name = "gps-cdcl"
+  solver-version = 1
diff --git a/Gopkg.toml b/Gopkg.toml
new file mode 100644
index 0000000..93f7a5a
--- /dev/null
+++ b/Gopkg.toml
@@ -0,0 +1,35 @@
+
+# Gopkg.toml example
+#
+# Refer to https://github.com/golang/dep/blob/master/docs/Gopkg.toml.md
+# for detailed Gopkg.toml documentation.
+#
+# required = ["github.com/user/thing/cmd/thing"]
+# ignored = ["github.com/user/project/pkgX", "bitbucket.org/user/project/pkgA/pkgY"]
+#
+# [[constraint]]
+#   name = "github.com/user/project"
+#   version = "1.0.0"
+#
+# [[constraint]]
+#   name = "github.com/user/project2"
+#   branch = "dev"
+#   source = "github.com/myfork/project2"
+#
+# [[override]]
+#  name = "github.com/x/y"
+#  version = "2.4.0"
+
+ignored = ["github.com/alecthomas/assert"]
+
+[[constraint]]
+  name = "github.com/pkg/errors"
+  version = "0.8.0"
+
+[[constraint]]
+  name = "github.com/stretchr/testify"
+  version = "1.1.4"
+
+[[constraint]]
+  branch = "master"
+  name = "github.com/xtgo/set"
diff --git a/README.md b/README.md
index 3ce26e2..4576b81 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ Package hm is a simple Hindley-Milner type inference system in Go. It provides t
 
 This package is go-gettable: `go get -u github.com/chewxy/hm`
 
-There are very few dependencies that this package uses. Therefore there isn't a need for vendoring tools.
+There are very few dependencies that this package uses. Therefore there isn't a need for vendoring tools. However, package hm DOES provide a `Gopkg.toml` and `Gopkg.lock` for any potential users of the [dep](https://github.com/golang/dep) tool.
 
 Here is a listing of the dependencies of `hm`: