diff --git a/.circleci/config.yml b/.circleci/config.yml
index b1a90c37c..36a53c1c1 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -112,7 +112,7 @@ jobs:
         - *save
 
 workflows:
-  version: 2
+  version: "2.1"
   build:
     jobs:
       - cabal-ghc-8_6_3