diff --git a/2020/day01/go.mod b/2020/day01/go.mod
new file mode 100644
index 0000000..87e4b5b
--- /dev/null
+++ b/2020/day01/go.mod
@@ -0,0 +1,3 @@
+module 2020/day01
+
+go 1.25.4