diff --git a/go.mod b/go.mod
index 9d21cb0..85e32cd 100644
--- a/go.mod
+++ b/go.mod
@@ -3,6 +3,7 @@
 go 1.12
 
 require (
+	github.com/EagleChen/mapmutex v0.0.0-20180418073615-e1a5ae258d8d
 	github.com/cenkalti/backoff/v3 v3.1.1
 	github.com/gogo/protobuf v1.3.1
 	github.com/golang/protobuf v1.3.2