diff --git a/CHANGELOG.md b/CHANGELOG.md
index db724e0..989cb7b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # go-utils
 
+<a name="v1.3.0"></a>
+## [v1.3.0] - 2020-03-06
+### New Features
+- add lower map key
+
+
 <a name="v1.2.0"></a>
 ## [v1.2.0] - 2020-02-04
 ### New Features
@@ -21,7 +27,8 @@
 - init go-utils
 
 
-[Unreleased]: https://github.com/kumparan/kumnats/compare/v1.2.0...HEAD
+[Unreleased]: https://github.com/kumparan/kumnats/compare/v1.3.0...HEAD
+[v1.3.0]: https://github.com/kumparan/kumnats/compare/v1.2.0...v1.3.0
 [v1.2.0]: https://github.com/kumparan/kumnats/compare/v1.1.1...v1.2.0
 [v1.1.1]: https://github.com/kumparan/kumnats/compare/v1.1.0...v1.1.1
 [v1.1.0]: https://github.com/kumparan/kumnats/compare/v1.0.0...v1.1.0
diff --git a/map.go b/map.go
new file mode 100644
index 0000000..1c53a14
--- /dev/null
+++ b/map.go
@@ -0,0 +1,11 @@
+package utils
+
+import "strings"
+
+func LowerMapStringKey(v map[string]interface{}) map[string]interface{} {
+	lv := make(map[string]interface{}, len(v))
+	for mk, mv := range v {
+		lv[strings.ToLower(mk)] = mv
+	}
+	return lv
+}
diff --git a/map_test.go b/map_test.go
new file mode 100644
index 0000000..20e4481
--- /dev/null
+++ b/map_test.go
@@ -0,0 +1,15 @@
+package utils
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_LowerMapStringKey(t *testing.T) {
+	value := map[string]interface{}{
+		"storyID" : "testing",
+	}
+	res := LowerMapStringKey(value)
+	assert.Equal(t, res["storyid"].(string), "testing")
+}