diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..99ab181
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,5 @@
+module github.com/sony/sonyflake
+
+go 1.12
+
+require github.com/deckarep/golang-set v1.7.1
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..898e5f9
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,2 @@
+github.com/deckarep/golang-set v1.7.1 h1:SCQV0S6gTtp6itiFrTqI+pfmJ4LN85S1YzhDf9rTHJQ=
+github.com/deckarep/golang-set v1.7.1/go.mod h1:93vsz/8Wt4joVM7c2AVqh+YRMiUSc14yDtF28KmMOgQ=