diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index 2180af5..190e10b 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -7,7 +7,7 @@ jobs:
     - uses: actions/checkout@master
     - uses: actions/setup-ruby@v1
       with:
-        ruby-version: '2.x'
+        ruby-version: '2.6.5'
     - run: |
         gem install bundler
         bundle install --jobs 4 --retry 3
diff --git a/.rubocop.yml b/.rubocop.yml
index 14fb6ee..60da610 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,4 +1,7 @@
 inherit_from: .rubocop_todo.yml
 
+AllCops:
+  TargetRubyVersion: 2.6
+
 Style/Documentation:
   Enabled: false
diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 5cfd420..456ee5d 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -1,6 +1,6 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2018-01-13 11:27:47 -0500 using RuboCop version 0.52.1.
+# on 2019-12-31 10:11:37 -0500 using RuboCop version 0.78.0.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
diff --git a/Gemfile b/Gemfile
index e5307fc..8f3e883 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,8 @@
+# frozen_string_literal: true
+
 source 'https://rubygems.org'
 
-ruby '2.4.1' if ENV.key?('DYNO')
+ruby '2.6.5' if ENV.key?('DYNO')
 
 gem 'aws-sdk', '~> 2'
 gem 'pry', group: %i[development test]
diff --git a/Gemfile.lock b/Gemfile.lock
index 647fd14..fd9bc0c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,37 +1,39 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    ast (2.3.0)
-    aws-sdk (2.10.117)
-      aws-sdk-resources (= 2.10.117)
-    aws-sdk-core (2.10.117)
+    ast (2.4.0)
+    aws-eventstream (1.0.3)
+    aws-sdk (2.11.421)
+      aws-sdk-resources (= 2.11.421)
+    aws-sdk-core (2.11.421)
       aws-sigv4 (~> 1.0)
       jmespath (~> 1.0)
-    aws-sdk-resources (2.10.117)
-      aws-sdk-core (= 2.10.117)
-    aws-sigv4 (1.0.2)
+    aws-sdk-resources (2.11.421)
+      aws-sdk-core (= 2.11.421)
+    aws-sigv4 (1.1.0)
+      aws-eventstream (~> 1.0, >= 1.0.2)
     coderay (1.1.2)
-    jmespath (1.3.1)
-    method_source (0.9.0)
-    parallel (1.12.1)
-    parser (2.4.0.2)
-      ast (~> 2.3)
-    powerpack (0.1.1)
-    pry (0.11.3)
+    jaro_winkler (1.5.4)
+    jmespath (1.4.0)
+    method_source (0.9.2)
+    parallel (1.19.1)
+    parser (2.7.0.1)
+      ast (~> 2.4.0)
+    pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
-    rack (2.0.3)
+    rack (2.0.8)
     rainbow (3.0.0)
-    rake (12.3.0)
-    rubocop (0.52.1)
+    rake (13.0.1)
+    rubocop (0.78.0)
+      jaro_winkler (~> 1.5.1)
       parallel (~> 1.10)
-      parser (>= 2.4.0.2, < 3.0)
-      powerpack (~> 0.1)
+      parser (>= 2.6)
       rainbow (>= 2.2.2, < 4.0)
       ruby-progressbar (~> 1.7)
-      unicode-display_width (~> 1.0, >= 1.0.1)
-    ruby-progressbar (1.9.0)
-    unicode-display_width (1.3.0)
+      unicode-display_width (>= 1.4.0, < 1.7)
+    ruby-progressbar (1.10.1)
+    unicode-display_width (1.6.0)
 
 PLATFORMS
   ruby
@@ -44,4 +46,4 @@ DEPENDENCIES
   rubocop
 
 BUNDLED WITH
-   1.16.1
+   2.1.2
diff --git a/Rakefile b/Rakefile
index be86fd9..3745221 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 begin
   require 'rubocop/rake_task'
 rescue LoadError => e
diff --git a/config.ru b/config.ru
index 62bc808..5486f53 100644
--- a/config.ru
+++ b/config.ru
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 run ->(*) { [301, { 'Location' => ENV['CPI_FEED_URL'] }, []] }
diff --git a/mini_s3put.rb b/mini_s3put.rb
index 9bb0545..27f4698 100644
--- a/mini_s3put.rb
+++ b/mini_s3put.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'aws-sdk'
 
 class MiniS3put