diff --git a/Gemfile.lock b/Gemfile.lock
index 82f27b9..63141fb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -43,6 +43,8 @@ GEM
     ffi (1.15.5-java)
     google-cloud-env (1.6.0)
       faraday (>= 0.17.3, < 3.0)
+    json (2.6.3)
+    json (2.6.3-java)
     method_source (1.0.0)
     mock_redis (0.32.0)
       ruby2_keywords
@@ -89,7 +91,7 @@ GEM
     opentelemetry-semantic_conventions (1.8.0)
       opentelemetry-api (~> 1.0)
     parallel (1.22.1)
-    parser (3.1.2.0)
+    parser (3.1.3.0)
       ast (~> 2.4.1)
     pickup (0.0.11)
     prometheus-client (2.1.0)
@@ -112,7 +114,7 @@ GEM
     rainbow (3.1.1)
     rake (13.0.6)
     redis (4.7.1)
-    regexp_parser (2.5.0)
+    regexp_parser (2.6.1)
     rexml (3.2.5)
     rspec (3.11.0)
       rspec-core (~> 3.11.0)
@@ -127,16 +129,17 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.11.0)
     rspec-support (3.11.0)
-    rubocop (1.28.2)
+    rubocop (1.40.0)
+      json (~> 2.3)
       parallel (~> 1.10)
-      parser (>= 3.1.0.0)
+      parser (>= 3.1.2.1)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 1.8, < 3.0)
-      rexml
-      rubocop-ast (>= 1.17.0, < 2.0)
+      rexml (>= 3.2.5, < 4.0)
+      rubocop-ast (>= 1.23.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 3.0)
-    rubocop-ast (1.19.1)
+    rubocop-ast (1.24.0)
       parser (>= 3.1.1.0)
     ruby-progressbar (1.11.0)
     ruby2_keywords (0.0.5)
@@ -159,7 +162,7 @@ GEM
     thor (1.2.1)
     thrift (0.16.0)
     tilt (2.0.11)
-    unicode-display_width (2.2.0)
+    unicode-display_width (2.3.0)
     yarjuf (2.0.0)
       builder
       rspec (~> 3)
@@ -175,7 +178,7 @@ DEPENDENCIES
   pry
   rack-test (>= 0.6)
   rspec (>= 3.2)
-  rubocop (~> 1.28.2)
+  rubocop (~> 1.40.0)
   simplecov (>= 0.11.2)
   thor (~> 1.0, >= 1.0.1)
   vmpooler!
diff --git a/vmpooler.gemspec b/vmpooler.gemspec
index 9e3fb3a..fbee33d 100644
--- a/vmpooler.gemspec
+++ b/vmpooler.gemspec
@@ -43,7 +43,7 @@ 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', '~> 1.28.2'
+  s.add_development_dependency 'rubocop', '~> 1.40.0'
   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'