diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 082145a..7e55b85 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,4 +1,4 @@
-image: ruby:2.5.8
+image: ruby:2.6.6
 
 stages:
 - test
diff --git a/.ruby-version b/.ruby-version
index ecd7ee5..338a5b5 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.5.8
+2.6.6
diff --git a/docker-compose.yml b/docker-compose.yml
index e37ada8..0abec5c 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -11,7 +11,7 @@ services:
       - "4000:80"
 
   jekyll:
-    image: ruby:2.5.8
+    image: ruby:2.6.6
     working_dir: /src
     environment:
       BUNDLE_PATH: /vendor