diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000000000000000000000000000000000000..b98b1cd48f76bc17ca17b46f8e4776b9be866d54
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module metrosim
+
+go 1.21.1