diff --git a/.circleci/config.yml b/.circleci/config.yml
index 3fa5a2d12..b96a5cc49 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -3,7 +3,7 @@ jobs:
   build:
     parallelism: 3
     docker:
-      - image: ruby:2.3.1
+      - image: ruby:2.3.5
       - image: postgres:9.4.1
         environment:
           POSTGRES_USER: tps_test