diff --git a/circle.yml b/circle.yml
index e37a53d..c360bb9 100644
--- a/circle.yml
+++ b/circle.yml
@@ -1,3 +1,5 @@
+version: 2
+
 machine:
   environment:
     PATH: "/home/ubuntu/cmake-3.11.0-Linux-x86_64/bin:$PATH"