diff --git a/.circleci/config.yml b/.circleci/config.yml
index f75e47c78..c3eb382b8 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -2,7 +2,7 @@ version: 2
 defaults: &defaults
   macos:
     xcode: '9.3.0'
-  parallelism: 4
+  parallelism: 1
   shell: /bin/bash --login    
   environment:
     CIRCLE_ARTIFACTS: /tmp/circleci-artifacts
@@ -102,4 +102,4 @@ workflows:
   pr_build:
     jobs:
       - build
-      - carthage_without_swiftlint_integration
\ No newline at end of file
+      - carthage_without_swiftlint_integration