diff --git a/.rock.yml b/.rock.yml
new file mode 100644
index 0000000000000000000000000000000000000000..25e15c638b8360c79e9b862d86b375ef0d7b8dc1
--- /dev/null
+++ b/.rock.yml
@@ -0,0 +1 @@
+runtime: ruby21
\ No newline at end of file