diff --git a/Dockerfile b/Dockerfile
index c49578febd088be1e8f2d99020624824b60b7d22..c03631c95ace7ea58f83cb654c89ad1a5c0c92d4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.6.3
+FROM ruby:2.6.4
 
 RUN apt-get -y update && apt-get -y upgrade
 
diff --git a/Gemfile b/Gemfile
index 8e641f286aa8a90a2339ebbafea82b7400e3e25c..d0f61a3649c762b272bc4910585057bb6970d470 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 source 'https://rubygems.org'
-ruby '2.6.3'
+ruby '2.6.4'
 
 gem 'activesupport'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 817311629db93dfc6c4334e45604089b7e9d8dab..18fc1714def1fabafda765753946619b3b4e803f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,23 +1,24 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (5.2.0)
+    activesupport (6.0.0)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.5.2)
-      public_suffix (>= 2.0.2, < 4.0)
+      zeitwerk (~> 2.1, >= 2.1.8)
+    addressable (2.7.0)
+      public_suffix (>= 2.0.2, < 5.0)
     ast (2.4.0)
     coderay (1.1.2)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.5)
     crack (0.4.3)
       safe_yaml (~> 1.0.0)
     diff-lcs (1.3)
-    docile (1.3.0)
+    docile (1.3.2)
     ffi (1.11.1)
     formatador (0.2.5)
-    guard (2.14.2)
+    guard (2.15.1)
       formatador (>= 0.2.4)
       listen (>= 2.7, < 4.0)
       lumberjack (>= 1.0.12, < 2.0)
@@ -26,8 +27,8 @@ GEM
       pry (>= 0.9.12)
       shellany (~> 0.0)
       thor (>= 0.18.1)
-    guard-bundler (2.1.0)
-      bundler (~> 1.0)
+    guard-bundler (2.2.1)
+      bundler (>= 1.3.0, < 3)
       guard (~> 2.2)
       guard-compat (~> 1.1)
     guard-compat (1.2.1)
@@ -38,71 +39,72 @@ GEM
     guard-rubocop (1.3.0)
       guard (~> 2.0)
       rubocop (~> 0.20)
-    hashdiff (0.3.7)
-    i18n (1.0.0)
+    hashdiff (1.0.0)
+    i18n (1.6.0)
       concurrent-ruby (~> 1.0)
-    json (2.1.0)
+    jaro_winkler (1.5.3)
+    json (2.2.0)
     listen (3.1.5)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
       ruby_dep (~> 1.2)
     lumberjack (1.0.13)
-    method_source (0.9.0)
-    minitest (5.11.3)
+    method_source (0.9.2)
+    minitest (5.12.2)
     nenv (0.3.0)
-    notiffany (0.1.1)
+    notiffany (0.1.3)
       nenv (~> 0.1)
       shellany (~> 0.0)
-    parallel (1.12.1)
-    parser (2.5.1.0)
+    parallel (1.17.0)
+    parser (2.6.4.1)
       ast (~> 2.4.0)
-    powerpack (0.1.1)
-    pry (0.11.3)
+    pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
-    public_suffix (3.0.2)
+    public_suffix (4.0.1)
     rainbow (3.0.0)
     rb-fsevent (0.10.3)
-    rb-inotify (0.9.10)
-      ffi (>= 0.5.0, < 2)
-    rspec (3.7.0)
-      rspec-core (~> 3.7.0)
-      rspec-expectations (~> 3.7.0)
-      rspec-mocks (~> 3.7.0)
-    rspec-core (3.7.1)
-      rspec-support (~> 3.7.0)
-    rspec-expectations (3.7.0)
+    rb-inotify (0.10.0)
+      ffi (~> 1.0)
+    rspec (3.8.0)
+      rspec-core (~> 3.8.0)
+      rspec-expectations (~> 3.8.0)
+      rspec-mocks (~> 3.8.0)
+    rspec-core (3.8.2)
+      rspec-support (~> 3.8.0)
+    rspec-expectations (3.8.4)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.7.0)
-    rspec-mocks (3.7.0)
+      rspec-support (~> 3.8.0)
+    rspec-mocks (3.8.1)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.7.0)
-    rspec-support (3.7.1)
-    rubocop (0.54.0)
+      rspec-support (~> 3.8.0)
+    rspec-support (3.8.2)
+    rubocop (0.75.0)
+      jaro_winkler (~> 1.5.1)
       parallel (~> 1.10)
-      parser (>= 2.5)
-      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 (>= 1.4.0, < 1.7)
+    ruby-progressbar (1.10.1)
     ruby_dep (1.5.0)
-    safe_yaml (1.0.4)
+    safe_yaml (1.0.5)
     shellany (0.0.1)
-    simplecov (0.16.1)
+    simplecov (0.17.1)
       docile (~> 1.1)
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.2)
-    thor (0.20.0)
+    thor (0.20.3)
     thread_safe (0.3.6)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
-    unicode-display_width (1.3.0)
-    webmock (3.3.0)
+    unicode-display_width (1.6.0)
+    webmock (3.7.6)
       addressable (>= 2.3.6)
       crack (>= 0.3.2)
-      hashdiff
+      hashdiff (>= 0.4.0, < 2.0.0)
+    zeitwerk (2.1.10)
 
 PLATFORMS
   ruby
@@ -117,7 +119,7 @@ DEPENDENCIES
   webmock
 
 RUBY VERSION
-   ruby 2.6.3p62
+   ruby 2.6.4p104
 
 BUNDLED WITH
-   1.17.2
+   2.0.2