diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 149247e..70b17a2 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,4 +1,4 @@
-image: ruby:2.3
+image: ruby:2.5.3
 
 variables:
   JEKYLL_ENV: production
diff --git a/.ruby-version b/.ruby-version
new file mode 100644
index 0000000..a4db534
--- /dev/null
+++ b/.ruby-version
@@ -0,0 +1 @@
+2.5.3
\ No newline at end of file