diff --git a/go.mod b/go.mod
index 61ae965..feea5cd 100644
--- a/go.mod
+++ b/go.mod
@@ -1 +1,3 @@
-module github.com/goombaio/orderedmap
+module github.com/shiyuleixia/orderedmap
+
+go 1.15
diff --git a/orderedmap.go b/orderedmap.go
index 05736bb..c64bc6b 100644
--- a/orderedmap.go
+++ b/orderedmap.go
@@ -25,7 +25,7 @@ import (
 // OrderedMap represents an associative array or map abstract data type.
 type OrderedMap struct {
 	// mu Mutex protects data structures below.
-	mu sync.Mutex
+	mu sync.RWMutex
 
 	// keys is the Set list of keys.
 	keys []interface{}
@@ -60,8 +60,8 @@ func (m *OrderedMap) Put(key interface{}, value interface{}) {
 
 // Get returns the value of a key from the OrderedMap.
 func (m *OrderedMap) Get(key interface{}) (value interface{}, found bool) {
-	m.mu.Lock()
-	defer m.mu.Unlock()
+	m.mu.RLock()
+	defer m.mu.RUnlock()
 
 	value, found = m.store[key]
 	return value, found