diff --git a/go.mod b/go.mod
index e180d70..5e108d3 100644
--- a/go.mod
+++ b/go.mod
@@ -3,8 +3,12 @@
 require (
 	github.com/cockroachdb/apd v1.1.0
 	github.com/ghodss/yaml v1.0.0
+	github.com/google/go-cmp v0.2.0
+	github.com/mitchellh/go-homedir v1.0.0
 	github.com/pkg/errors v0.8.0 // indirect
+	github.com/spf13/cobra v0.0.3
+	github.com/spf13/viper v1.3.1
 	golang.org/x/exp/errors v0.0.0-20181210123644-7d6377eee41f
+	golang.org/x/sync v0.0.0-20181108010431-42b317875d0f
 	golang.org/x/tools v0.0.0-20181210225255-6a3e9aa2ab77
-	gopkg.in/yaml.v2 v2.2.2 // indirect
 )