diff --git a/Gemfile.lock b/Gemfile.lock
index eb102a8..4976307 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -112,15 +112,15 @@ 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)
+      unicode-display_width (>= 1.4.0, < 3.0)
     rubocop-ast (1.19.1)
       parser (>= 3.1.1.0)
     ruby-progressbar (1.11.0)
@@ -144,7 +144,7 @@ GEM
     thor (1.2.1)
     thrift (0.16.0)
     tilt (2.0.11)
-    unicode-display_width (1.8.0)
+    unicode-display_width (2.1.0)
     vmpooler (2.4.0)
       concurrent-ruby (~> 1.1)
       connection_pool (~> 2.2)
@@ -179,7 +179,7 @@ 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 (~> 2.4)
diff --git a/vmpooler-provider-vsphere.gemspec b/vmpooler-provider-vsphere.gemspec
index 4c66499..f40d43e 100644
--- a/vmpooler-provider-vsphere.gemspec
+++ b/vmpooler-provider-vsphere.gemspec
@@ -25,7 +25,7 @@ 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'