diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..9d099b9
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module github.com/emmansun/gmsm
+
+go 1.14
diff --git a/sm2/sm2.go b/sm2/sm2.go
index 0581578..2bfbdbd 100644
--- a/sm2/sm2.go
+++ b/sm2/sm2.go
@@ -6,9 +6,10 @@ import (
 	"encoding/binary"
 	"errors"
 	"fmt"
-	"gmsm/sm3"
 	"io"
 	"math/big"
+
+	"github.com/emmansun/gmsm/sm3"
 )
 
 const (