diff --git a/Gemfile b/Gemfile
index ae5b641..0c92cfc 100644
--- a/Gemfile
+++ b/Gemfile
@@ -25,9 +25,9 @@ group :development, :test do
   gem 'byebug', platform: :mri # Call 'byebug' anywhere in the code to stop execution and get a debugger console
   gem 'rb-readline'
   gem 'rspec-rails', '~> 3.5'
-  gem 'rubocop', '~> 1.19.0' # Enforce ruby code style
-  gem 'rubocop-rails', '~> 2.12'
-  gem 'rubocop-rspec', '~> 2.5'
+  gem 'rubocop', '~> 1.20.0' # Enforce ruby code style
+  gem 'rubocop-rails', '~> 2.15', '>= 2.15.0'
+  gem 'rubocop-rspec', '~> 2.11', '>= 2.11.0'
   gem 'simplecov', require: false # determine code coverage of tests
 end
 
@@ -39,5 +39,5 @@ group :development do
 end
 
 group :test do
-  gem 'webmock' # used by vcr gem
+  gem 'webmock' , '>= 3.19.0' # used by vcr gem
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index 3ed28a1..e9fabfa 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -42,14 +42,16 @@ GEM
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.8.4)
-      public_suffix (>= 2.0.2, < 6.0)
+    addressable (2.8.7)
+      public_suffix (>= 2.0.2, < 7.0)
     arel (9.0.0)
     ast (2.4.2)
+    bigdecimal (3.1.8)
     builder (3.2.4)
     byebug (11.1.3)
-    concurrent-ruby (1.2.2)
-    crack (0.4.5)
+    concurrent-ruby (1.3.3)
+    crack (1.0.0)
+      bigdecimal
       rexml
     crass (1.0.6)
     diff-lcs (1.5.0)
@@ -70,8 +72,8 @@ GEM
     ffi (1.9.25)
     globalid (1.1.0)
       activesupport (>= 5.0)
-    hashdiff (1.0.1)
-    i18n (1.14.1)
+    hashdiff (1.1.0)
+    i18n (1.14.5)
       concurrent-ruby (~> 1.0)
     io-wait (0.3.0)
     jbuilder (2.11.5)
@@ -92,7 +94,7 @@ GEM
     method_source (1.0.0)
     mini_mime (1.1.2)
     mini_portile2 (2.6.1)
-    minitest (5.15.0)
+    minitest (5.24.1)
     multipart-post (2.3.0)
     net-imap (0.2.2)
       digest
@@ -112,16 +114,16 @@ GEM
     nokogiri (1.12.5)
       mini_portile2 (~> 2.6.1)
       racc (~> 1.4)
-    parallel (1.23.0)
-    parser (3.2.2.3)
+    parallel (1.25.1)
+    parser (3.3.4.0)
       ast (~> 2.4.1)
       racc
     pg (0.21.0)
-    public_suffix (4.0.7)
+    public_suffix (5.1.1)
     puma (4.3.12)
       nio4r (~> 2.0)
-    racc (1.7.1)
-    rack (2.2.7)
+    racc (1.8.1)
+    rack (2.2.9)
     rack-test (2.1.0)
       rack (>= 1.3)
     rails (5.2.8.1)
@@ -154,10 +156,11 @@ GEM
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rb-readline (0.5.5)
-    regexp_parser (2.8.1)
+    regexp_parser (2.9.2)
     request_store (1.5.1)
       rack (>= 1.4)
-    rexml (3.2.5)
+    rexml (3.3.4)
+      strscan
     rspec-core (3.9.3)
       rspec-support (~> 3.9.3)
     rspec-expectations (3.9.4)
@@ -175,7 +178,7 @@ GEM
       rspec-mocks (~> 3.9.0)
       rspec-support (~> 3.9.0)
     rspec-support (3.9.4)
-    rubocop (1.19.1)
+    rubocop (1.20.0)
       parallel (~> 1.10)
       parser (>= 3.0.0.0)
       rainbow (>= 2.2.2, < 4.0)
@@ -184,13 +187,13 @@ GEM
       rubocop-ast (>= 1.9.1, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 3.0)
-    rubocop-ast (1.17.0)
-      parser (>= 3.1.1.0)
-    rubocop-rails (2.14.2)
+    rubocop-ast (1.31.3)
+      parser (>= 3.3.1.0)
+    rubocop-rails (2.15.2)
       activesupport (>= 4.2.0)
       rack (>= 1.1)
       rubocop (>= 1.7.0, < 2.0)
-    rubocop-rspec (2.10.0)
+    rubocop-rspec (2.11.1)
       rubocop (~> 1.19)
     ruby-progressbar (1.13.0)
     simplecov (0.22.0)
@@ -222,8 +225,8 @@ GEM
     timeout (0.3.2)
     tzinfo (1.2.11)
       thread_safe (~> 0.1)
-    unicode-display_width (2.4.2)
-    webmock (3.18.1)
+    unicode-display_width (2.5.0)
+    webmock (3.23.1)
       addressable (>= 2.8.0)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)
@@ -248,12 +251,14 @@ DEPENDENCIES
   rails (~> 5.2)
   rb-readline
   rspec-rails (~> 3.5)
-  rubocop (~> 1.19.0)
-  rubocop-rails (~> 2.12)
-  rubocop-rspec (~> 2.5)
+  rubocop (~> 1.20.0)
+  rubocop-rails (~> 2.15, >= 2.15.0)
+  rubocop-rspec (~> 2.11, >= 2.11.0)
   simplecov
   spring
   spring-watcher-listen (~> 2.0.0)
   strong_migrations (~> 0.3)
-  webmock
+  webmock (>= 3.19.0)
 
+BUNDLED WITH
+   2.1.4