diff --git a/.gitignore b/.gitignore
index 7f84399..f903160 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,4 +12,6 @@
 *.out
 
 go-yq*
-test.yaml
\ No newline at end of file
+test.yaml
+
+vendor
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
index c1f33fd..ad80837 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,8 @@
 language: go
 script:
-  - go test
+  - curl https://raw.githubusercontent.com/golang/dep/master/install.sh | sh
+  - dep ensure -update
+  - go test ./... -cover
   - wget https://gist.githubusercontent.com/030/da7c28869ae69fc4c02634e253ab615b/raw/43df4fbbff30d6e065e0de1270e5ee9ad0803bb7/go-releases.sh
   - chmod +x ./go-releases.sh
   - ./go-releases.sh yq
diff --git a/Gopkg.lock b/Gopkg.lock
new file mode 100644
index 0000000..f87cfa9
--- /dev/null
+++ b/Gopkg.lock
@@ -0,0 +1,137 @@
+# This file is autogenerated, do not edit; changes may be undone by the next 'dep ensure'.
+
+
+[[projects]]
+  digest = "1:abeb38ade3f32a92943e5be54f55ed6d6e3b6602761d74b4aab4c9dd45c18abd"
+  name = "github.com/fsnotify/fsnotify"
+  packages = ["."]
+  pruneopts = "UT"
+  revision = "c2828203cd70a50dcccfb2761f8b1f8ceef9a8e9"
+  version = "v1.4.7"
+
+[[projects]]
+  digest = "1:c0d19ab64b32ce9fe5cf4ddceba78d5bc9807f0016db6b1183599da3dcc24d10"
+  name = "github.com/hashicorp/hcl"
+  packages = [
+    ".",
+    "hcl/ast",
+    "hcl/parser",
+    "hcl/printer",
+    "hcl/scanner",
+    "hcl/strconv",
+    "hcl/token",
+    "json/parser",
+    "json/scanner",
+    "json/token",
+  ]
+  pruneopts = "UT"
+  revision = "8cb6e5b959231cc1119e43259c4a608f9c51a241"
+  version = "v1.0.0"
+
+[[projects]]
+  digest = "1:c568d7727aa262c32bdf8a3f7db83614f7af0ed661474b24588de635c20024c7"
+  name = "github.com/magiconair/properties"
+  packages = ["."]
+  pruneopts = "UT"
+  revision = "c2353362d570a7bfa228149c62842019201cfb71"
+  version = "v1.8.0"
+
+[[projects]]
+  digest = "1:53bc4cd4914cd7cd52139990d5170d6dc99067ae31c56530621b18b35fc30318"
+  name = "github.com/mitchellh/mapstructure"
+  packages = ["."]
+  pruneopts = "UT"
+  revision = "3536a929edddb9a5b34bd6861dc4a9647cb459fe"
+  version = "v1.1.2"
+
+[[projects]]
+  digest = "1:95741de3af260a92cc5c7f3f3061e85273f5a81b5db20d4bd68da74bd521675e"
+  name = "github.com/pelletier/go-toml"
+  packages = ["."]
+  pruneopts = "UT"
+  revision = "c01d1270ff3e442a8a57cddc1c92dc1138598194"
+  version = "v1.2.0"
+
+[[projects]]
+  digest = "1:6a4a11ba764a56d2758899ec6f3848d24698d48442ebce85ee7a3f63284526cd"
+  name = "github.com/spf13/afero"
+  packages = [
+    ".",
+    "mem",
+  ]
+  pruneopts = "UT"
+  revision = "d40851caa0d747393da1ffb28f7f9d8b4eeffebd"
+  version = "v1.1.2"
+
+[[projects]]
+  digest = "1:08d65904057412fc0270fc4812a1c90c594186819243160dc779a402d4b6d0bc"
+  name = "github.com/spf13/cast"
+  packages = ["."]
+  pruneopts = "UT"
+  revision = "8c9545af88b134710ab1cd196795e7f2388358d7"
+  version = "v1.3.0"
+
+[[projects]]
+  digest = "1:68ea4e23713989dc20b1bded5d9da2c5f9be14ff9885beef481848edd18c26cb"
+  name = "github.com/spf13/jwalterweatherman"
+  packages = ["."]
+  pruneopts = "UT"
+  revision = "4a4406e478ca629068e7768fc33f3f044173c0a6"
+  version = "v1.0.0"
+
+[[projects]]
+  digest = "1:c1b1102241e7f645bc8e0c22ae352e8f0dc6484b6cb4d132fa9f24174e0119e2"
+  name = "github.com/spf13/pflag"
+  packages = ["."]
+  pruneopts = "UT"
+  revision = "298182f68c66c05229eb03ac171abe6e309ee79a"
+  version = "v1.0.3"
+
+[[projects]]
+  digest = "1:de37e343c64582d7026bf8ab6ac5b22a72eac54f3a57020db31524affed9f423"
+  name = "github.com/spf13/viper"
+  packages = ["."]
+  pruneopts = "UT"
+  revision = "6d33b5a963d922d182c91e8a1c88d81fd150cfd4"
+  version = "v1.3.1"
+
+[[projects]]
+  branch = "master"
+  digest = "1:418531991b3ea024fd1947c8fdd18019b3ce285025955fddc6b8e4cc4f9213fc"
+  name = "golang.org/x/sys"
+  packages = ["unix"]
+  pruneopts = "UT"
+  revision = "7da8ea5c81829e397bdf930c5d8ba4b703616f33"
+
+[[projects]]
+  digest = "1:8029e9743749d4be5bc9f7d42ea1659471767860f0cdc34d37c3111bd308a295"
+  name = "golang.org/x/text"
+  packages = [
+    "internal/gen",
+    "internal/triegen",
+    "internal/ucd",
+    "transform",
+    "unicode/cldr",
+    "unicode/norm",
+  ]
+  pruneopts = "UT"
+  revision = "f21a4dfb5e38f5895301dc265a8def02365cc3d0"
+  version = "v0.3.0"
+
+[[projects]]
+  digest = "1:4d2e5a73dc1500038e504a8d78b986630e3626dc027bc030ba5c75da257cdb96"
+  name = "gopkg.in/yaml.v2"
+  packages = ["."]
+  pruneopts = "UT"
+  revision = "51d6538a90f86fe93ac480b35f37b2be17fef232"
+  version = "v2.2.2"
+
+[solve-meta]
+  analyzer-name = "dep"
+  analyzer-version = 1
+  input-imports = [
+    "github.com/spf13/viper",
+    "gopkg.in/yaml.v2",
+  ]
+  solver-name = "gps-cdcl"
+  solver-version = 1
diff --git a/Gopkg.toml b/Gopkg.toml
new file mode 100644
index 0000000..d7c5c9b
--- /dev/null
+++ b/Gopkg.toml
@@ -0,0 +1,38 @@
+# Gopkg.toml example
+#
+# Refer to https://golang.github.io/dep/docs/Gopkg.toml.html
+# 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"
+#
+# [prune]
+#   non-go = false
+#   go-tests = true
+#   unused-packages = true
+
+
+[[constraint]]
+  name = "github.com/spf13/viper"
+  version = "1.3.1"
+
+[[constraint]]
+  name = "gopkg.in/yaml.v2"
+  version = "2.2.2"
+
+[prune]
+  go-tests = true
+  unused-packages = true
diff --git a/main.go b/main.go
index a2d40e1..2dedfa1 100644
--- a/main.go
+++ b/main.go
@@ -30,7 +30,7 @@ func (i input) value() string {
 	if err != nil {
 		panic(fmt.Errorf("fatal error config file: %s", err))
 	}
-	value := fmt.Sprintf("%s", viper.Get(keyWithoutFirstDot))
+	value := fmt.Sprintf("%v", viper.Get(keyWithoutFirstDot))
 
 	if value == "%!s(<nil>)" {
 		log.Fatal("File: ", i.file, " does not contain key: ", i.key)
diff --git a/main_test.go b/main_test.go
index 8f96221..84e526b 100644
--- a/main_test.go
+++ b/main_test.go
@@ -34,6 +34,10 @@ firefox_checksum: sha512:49d776
 hello:
   world: hallo wereld
 world: [hola, hallo]
+firefox_version4: 64
+firefox_version3: 64.1
+firefox_version2: "64.0"
+firefox_version: 64.0.0
   `
 
 type T struct {
@@ -78,8 +82,12 @@ func TestYamlValue(t *testing.T) {
 		".foo.bar":                                     "boo",
 		".services.db.image":                           "someimage",
 		".services.db.environment.MYSQL_ROOT_PASSWORD": "somewordpress",
-		".world":       "[hola hallo]",
-		".hello.world": "hallo wereld",
+		".world":            "[hola hallo]",
+		".hello.world":      "hallo wereld",
+		".firefox_version4": "64",
+		".firefox_version3": "64.1",
+		".firefox_version2": "64.0",
+		".firefox_version":  "64.0.0",
 	}
 
 	for key, value := range keyValue {