diff --git a/Dockerfile b/Dockerfile
index 39cebf9..b4de55d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.4.1-stretch
+FROM ruby:2.6.0-stretch
 
 # throw errors if Gemfile has been modified since Gemfile.lock
 RUN bundle config --global frozen 1
diff --git a/Gemfile.lock b/Gemfile.lock
index b3ff794..3575970 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -307,7 +307,7 @@ DEPENDENCIES
   webmock (~> 3.0)
 
 RUBY VERSION
-   ruby 2.5.3p105
+   ruby 2.6.0p0
 
 BUNDLED WITH
    1.17.3