diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..4adb9c6
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,5 @@
+module github.com/mattn/go-xmpp
+
+go 1.20
+
+require golang.org/x/crypto v0.15.0
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..fcac726
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,2 @@
+golang.org/x/crypto v0.15.0 h1:frVn1TEaCEaZcn3Tmd7Y2b5KKPaZ+I32Q2OA3kYp5TA=
+golang.org/x/crypto v0.15.0/go.mod h1:4ChreQoLWfG3xLDer1WdlH5NdlQ3+mwnQq1YTKY+72g=