diff --git a/.rubocop.yml b/.rubocop.yml
index 2d50ca0..0fe1eff 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -66,6 +66,7 @@ Style/Next:
   Enabled: false
 Metrics/ParameterLists:
   Max: 10
+  MaxOptionalParameters: 10
 Style/GuardClause:
   Enabled: false
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 335c0ba..f138766 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -112,7 +112,7 @@ GEM
     opentelemetry-semantic_conventions (1.8.0)
       opentelemetry-api (~> 1.0)
     parallel (1.22.1)
-    parser (3.1.1.0)
+    parser (3.1.2.0)
       ast (~> 2.4.1)
     pickup (0.0.11)
     prometheus-client (2.1.0)
@@ -137,7 +137,7 @@ GEM
     rainbow (3.1.1)
     rake (13.0.6)
     redis (4.6.0)
-    regexp_parser (2.2.1)
+    regexp_parser (2.3.1)
     rexml (3.2.5)
     rspec (3.11.0)
       rspec-core (~> 3.11.0)
@@ -152,16 +152,16 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.11.0)
     rspec-support (3.11.0)
-    rubocop (1.1.0)
+    rubocop (1.28.2)
       parallel (~> 1.10)
-      parser (>= 2.7.1.5)
+      parser (>= 3.1.0.0)
       rainbow (>= 2.2.2, < 4.0)
-      regexp_parser (>= 1.8)
+      regexp_parser (>= 1.8, < 3.0)
       rexml
-      rubocop-ast (>= 1.0.1)
+      rubocop-ast (>= 1.17.0, < 2.0)
       ruby-progressbar (~> 1.7)
-      unicode-display_width (>= 1.4.0, < 2.0)
-    rubocop-ast (1.16.0)
+      unicode-display_width (>= 1.4.0, < 3.0)
+    rubocop-ast (1.17.0)
       parser (>= 3.1.1.0)
     ruby-progressbar (1.11.0)
     ruby2_keywords (0.0.5)
@@ -184,7 +184,7 @@ GEM
     thor (1.2.1)
     thrift (0.16.0)
     tilt (2.0.10)
-    unicode-display_width (1.8.0)
+    unicode-display_width (2.1.0)
     yarjuf (2.0.0)
       builder
       rspec (~> 3)
@@ -199,7 +199,7 @@ DEPENDENCIES
   pry
   rack-test (>= 0.6)
   rspec (>= 3.2)
-  rubocop (~> 1.1.0)
+  rubocop (~> 1.28.2)
   simplecov (>= 0.11.2)
   thor (~> 1.0, >= 1.0.1)
   vmpooler!
diff --git a/lib/vmpooler/api/helpers.rb b/lib/vmpooler/api/helpers.rb
index cb983cb..136b5f1 100644
--- a/lib/vmpooler/api/helpers.rb
+++ b/lib/vmpooler/api/helpers.rb
@@ -181,7 +181,7 @@ module Vmpooler
         /^\d{4}-\d{2}-\d{2}$/ === date_str
       end
 
-      # note: domain is not needed here, so we should update the callers of this method
+      # NOTE: domain is not needed here, so we should update the callers of this method
       def hostname_shorten(hostname, domain=nil)
         hostname[/[^.]+/]
       end
diff --git a/lib/vmpooler/pool_manager.rb b/lib/vmpooler/pool_manager.rb
index 9ed2982..95922d5 100644
--- a/lib/vmpooler/pool_manager.rb
+++ b/lib/vmpooler/pool_manager.rb
@@ -1596,19 +1596,19 @@ module Vmpooler
       $config[:pools].each do |pool|
         provider_name = pool['provider']
         # The provider_class parameter can be defined in the provider's data eg
-        #:providers:
-        # :vsphere:
-        #  provider_class: 'vsphere'
-        # :another-vsphere:
-        #  provider_class: 'vsphere'
+        # :providers:
+        #   :vsphere:
+        #     provider_class: 'vsphere'
+        #   :another-vsphere:
+        #     provider_class: 'vsphere'
         # the above would create two providers/vsphere.rb class objects named 'vsphere' and 'another-vsphere'
         # each pools would then define which provider definition to use: vsphere or another-vsphere
         #
         # if provider_class is not defined it will try to use the provider_name as the class, this is to be
         # backwards compatible for example when there is only one provider listed
         # :providers:
-        #  :dummy:
-        #   filename: 'db.txs'
+        #   :dummy:
+        #     filename: 'db.txs'
         # the above example would create an object based on the class providers/dummy.rb
         if $config[:providers].nil? || $config[:providers][provider_name.to_sym].nil? || $config[:providers][provider_name.to_sym]['provider_class'].nil?
           provider_class = provider_name
diff --git a/vmpooler.gemspec b/vmpooler.gemspec
index 49e2375..cee2a74 100644
--- a/vmpooler.gemspec
+++ b/vmpooler.gemspec
@@ -45,7 +45,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'pry'
   s.add_development_dependency 'rack-test', '>= 0.6'
   s.add_development_dependency 'rspec', '>= 3.2'
-  s.add_development_dependency 'rubocop', '~> 1.1.0'
+  s.add_development_dependency 'rubocop', '~> 1.28.2'
   s.add_development_dependency 'simplecov', '>= 0.11.2'
   s.add_development_dependency 'thor', '~> 1.0', '>= 1.0.1'
   s.add_development_dependency 'yarjuf', '>= 2.0'