diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..f7fd214
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,5 @@
+module tildegit.org/nervuri/client-hello-mirror
+
+go 1.19
+
+require golang.org/x/crypto v0.5.0
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..825f885
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,2 @@
+golang.org/x/crypto v0.5.0 h1:U/0M97KRkSFvyD/3FSmdP5W5swImpNgle/EHFhOsQPE=
+golang.org/x/crypto v0.5.0/go.mod h1:NK/OQwhpMQP3MwtdjgLlYHnH9ebylxKWv3e0fK+mkQU=