diff --git a/Gopkg.lock b/Gopkg.lock
new file mode 100644
index 0000000..0228094
--- /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/mattn/go-colorable"
+  packages = ["."]
+  revision = "167de6bfdfba052fa6b2d3664c8f5272e23c9072"
+  version = "v0.0.9"
+
+[[projects]]
+  name = "github.com/mattn/go-isatty"
+  packages = ["."]
+  revision = "0360b2af4f38e8d38c7fce2a9f4e702702d73a39"
+  version = "v0.0.3"
+
+[[projects]]
+  branch = "master"
+  name = "github.com/mattn/go-tty"
+  packages = ["."]
+  revision = "c1750293025292316a611ae8f632d9791515e51c"
+
+[[projects]]
+  branch = "master"
+  name = "github.com/pkg/term"
+  packages = ["termios"]
+  revision = "b1f72af2d63057363398bec5873d16a98b453312"
+
+[[projects]]
+  branch = "master"
+  name = "golang.org/x/sys"
+  packages = ["unix"]
+  revision = "37707fdb30a5b38865cfb95e5aab41707daec7fd"
+
+[solve-meta]
+  analyzer-name = "dep"
+  analyzer-version = 1
+  inputs-digest = "6c442f55617e93df75aa1ee2fd2b36cfab23003fded4723be56c6b6fd0545c56"
+  solver-name = "gps-cdcl"
+  solver-version = 1
diff --git a/Gopkg.toml b/Gopkg.toml
new file mode 100644
index 0000000..fe31c57
--- /dev/null
+++ b/Gopkg.toml
@@ -0,0 +1,34 @@
+
+# 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"
+
+
+[[constraint]]
+  name = "github.com/mattn/go-colorable"
+  version = "0.0.9"
+
+[[constraint]]
+  branch = "master"
+  name = "github.com/mattn/go-tty"
+
+[[constraint]]
+  branch = "master"
+  name = "github.com/pkg/term"
diff --git a/Makefile b/Makefile
index ce8c6bf..caf263c 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,8 @@ setup:  ## Setup for required tools.
 	go get github.com/golang/lint/golint
 	go get golang.org/x/tools/cmd/goimports
 	go get golang.org/x/tools/cmd/stringer
-	go get github.com/pkg/term
+	go get -u github.com/golang/dep/cmd/dep
+	dep ensure
 
 .PHONY: fmt
 fmt: ## Formatting source codes.