diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 6f3a9a4..4444710 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,4 +1,4 @@
-image: ruby:2.3
+image: ruby:2.4.2
 
 pages:
   stage: build