diff --git a/.circleci/config.yml b/.circleci/config.yml
index 02b07b45..09b01909 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -3,7 +3,7 @@ version: 2
 jobs:
   build:
     macos:
-      xcode: "9.4.0"
+      xcode: "9.3.0"
 
     steps:
       - checkout