diff --git a/go.mod b/go.mod
index 360045d..afd354a 100644
--- a/go.mod
+++ b/go.mod
@@ -4,7 +4,7 @@ go 1.12
 
 require (
 	github.com/blang/semver v3.5.1+incompatible
-	github.com/golang/protobuf v1.3.1
+	github.com/golang/protobuf v1.3.3
 	github.com/openacid/errors v0.8.1
 	github.com/openacid/must v0.1.3
 	github.com/stretchr/testify v1.3.0
diff --git a/go.sum b/go.sum
index d97ad6d..e2fb87f 100644
--- a/go.sum
+++ b/go.sum
@@ -4,6 +4,8 @@ github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/golang/protobuf v1.3.1 h1:YF8+flBXS5eO826T4nzqPrxfhQThhXl0YzfuUPu4SBg=
 github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/protobuf v1.3.3 h1:gyjaxf+svBWX08ZjK86iN9geUJF0H6gp2IRKX6Nf6/I=
+github.com/golang/protobuf v1.3.3/go.mod h1:vzj43D7+SQXF/4pzW/hwtAqwc6iTitCiVSaWz5lYuqw=
 github.com/openacid/errors v0.8.1 h1:Hrj9WENDoj5jP27ZfF60SY5LShbxei+sxKZa0EP+oDw=
 github.com/openacid/errors v0.8.1/go.mod h1:GUQEJJOJE3W9skHm8E8Y4phdl2LLEN8iD7c5gcGgdx0=
 github.com/openacid/must v0.1.1 h1:PG/s/1L9REdDZjbILpo+KYEDt2CAHM8sIFr2I2OesJQ=