diff --git a/.rubocop.yml b/.rubocop.yml
index 440bede..81ad424 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -2,22 +2,35 @@ AllCops:
   Exclude:
     - 'vendor/**/*'
     - '.git/**/*'
+    - 'node_modules/**/*'
+    - 'bin/bundle'
+    - 'bin/cap*'
+    - 'bin/rails'
+    - 'bin/rake'
+    - 'bin/rspec'
     - 'bin/rubocop'
-    - 'slackbuilds/**/*'
+    - 'bin/setup'
+    - 'bin/spring'
+    - 'bin/update'
+    - 'bin/webpack*'
+    - '**/db/*schema.rb'
+    - 'pkg/**/*'
+
+  TargetRubyVersion: '2.7'
 
 Style/Documentation:
   Enabled: false
 
-Style/TrailingCommaInHashLiteral:
-  EnforcedStyleForMultiline: consistent_comma
-
-Style/FrozenStringLiteralComment:
-  Exclude:
-    - '**/db/migrate/*'
+# False-Positive: non-string-variable + 'some string'
+Style/StringConcatenation:
+  Enabled: false
 
 Layout/MultilineMethodCallIndentation:
   EnforcedStyle: indented
 
+Layout/MultilineOperationIndentation:
+  EnforcedStyle: indented
+
 Layout/ArgumentAlignment:
   EnforcedStyle: with_fixed_indentation
 
@@ -25,6 +38,6 @@ Layout/EndAlignment:
   EnforcedStyleAlignWith: variable
 
 Metrics/BlockLength:
-  ExcludedMethods:
-    - describe
-    - refine
+  IgnoredMethods:
+  - describe
+  - refine
diff --git a/Gemfile b/Gemfile
index a5bdde9..22e48ad 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,6 +4,8 @@
 
 # frozen_string_literal: true
 
-source 'https://rubygems.caraus.de'
+source "https://rubygems.org"
 
-gem 'infra', '~> 2.0.0'
+git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
+
+gem 'rubocop', '~> 1.7', require: false
diff --git a/Gemfile.lock b/Gemfile.lock
index dffcdc9..9d1e531 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,36 +1,32 @@
 GEM
-  remote: https://rubygems.caraus.de/
+  remote: https://rubygems.org/
   specs:
     ast (2.4.1)
-    infra (2.0.0)
-      rake (~> 13.0)
-      rubocop (~> 0.89)
     parallel (1.20.1)
-    parser (2.7.2.0)
+    parser (3.0.0.0)
       ast (~> 2.4.1)
     rainbow (3.0.0)
-    rake (13.0.1)
-    regexp_parser (2.0.0)
+    regexp_parser (2.0.3)
     rexml (3.2.4)
-    rubocop (0.93.1)
+    rubocop (1.7.0)
       parallel (~> 1.10)
       parser (>= 2.7.1.5)
       rainbow (>= 2.2.2, < 4.0)
-      regexp_parser (>= 1.8)
+      regexp_parser (>= 1.8, < 3.0)
       rexml
-      rubocop-ast (>= 0.6.0)
+      rubocop-ast (>= 1.2.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 2.0)
-    rubocop-ast (1.2.0)
+    rubocop-ast (1.4.0)
       parser (>= 2.7.1.5)
-    ruby-progressbar (1.10.1)
+    ruby-progressbar (1.11.0)
     unicode-display_width (1.7.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  infra (~> 2.0.0)
+  rubocop (~> 1.7)
 
 BUNDLED WITH
    2.1.4