diff --git a/.rubocop.yml b/.rubocop.yml
new file mode 100644
index 0000000..7f5eb68
--- /dev/null
+++ b/.rubocop.yml
@@ -0,0 +1,653 @@
+AllCops:
+  Exclude:
+    - db/schema.rb
+
+Metrics/LineLength:
+  Description: 'Limit lines to 80 characters.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#80-character-limits'
+  Max: 80
+  Exclude:
+    - ./*.gemspec
+
+
+Naming/AccessorMethodName:
+  Description: Check the naming of accessor methods for get_/set_.
+  Enabled: false
+
+Style/Alias:
+  Description: 'Use alias_method instead of alias.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#alias-method'
+  Enabled: false
+
+Style/ArrayJoin:
+  Description: 'Use Array#join instead of Array#*.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#array-join'
+  Enabled: false
+
+Style/AsciiComments:
+  Description: 'Use only ascii symbols in comments.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#english-comments'
+  Enabled: false
+
+Naming/AsciiIdentifiers:
+  Description: 'Use only ascii symbols in identifiers.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#english-identifiers'
+  Enabled: false
+
+Style/Attr:
+  Description: 'Checks for uses of Module#attr.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#attr'
+  Enabled: false
+
+Metrics/BlockNesting:
+  Description: 'Avoid excessive block nesting'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#three-is-the-number-thou-shalt-count'
+  Enabled: false
+
+Style/CaseEquality:
+  Description: 'Avoid explicit use of the case equality operator(===).'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#no-case-equality'
+  Enabled: false
+
+Style/CharacterLiteral:
+  Description: 'Checks for uses of character literals.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#no-character-literals'
+  Enabled: false
+
+Style/ClassAndModuleChildren:
+  Description: 'Checks style of children classes and modules.'
+  Enabled: true
+  EnforcedStyle: nested
+
+Metrics/ClassLength:
+  Description: 'Avoid classes longer than 100 lines of code.'
+  Enabled: false
+
+Metrics/ModuleLength:
+  Description: 'Avoid modules longer than 100 lines of code.'
+  Enabled: false
+
+Style/ClassVars:
+  Description: 'Avoid the use of class variables.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#no-class-vars'
+  Enabled: false
+
+Style/CollectionMethods:
+  Enabled: true
+  PreferredMethods:
+    find: detect
+    inject: reduce
+    collect: map
+    find_all: select
+
+Style/ColonMethodCall:
+  Description: 'Do not use :: for method call.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#double-colons'
+  Enabled: false
+
+Style/CommentAnnotation:
+  Description: >-
+                 Checks formatting of special comments
+                 (TODO, FIXME, OPTIMIZE, HACK, REVIEW).
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#annotate-keywords'
+  Enabled: false
+
+Metrics/AbcSize:
+  Description: >-
+                 A calculated magnitude based on number of assignments,
+                 branches, and conditions.
+  Enabled: false
+
+Metrics/BlockLength:
+  CountComments: true  # count full line comments?
+  Max: 25
+  ExcludedMethods: []
+  Exclude:
+    - "spec/**/*"
+
+Metrics/CyclomaticComplexity:
+  Description: >-
+                 A complexity metric that is strongly correlated to the number
+                 of test cases needed to validate a method.
+  Enabled: false
+
+Rails/Delegate:
+  Description: 'Prefer delegate method for delegations.'
+  Enabled: false
+
+Style/PreferredHashMethods:
+  Description: 'Checks use of `has_key?` and `has_value?` Hash methods.'
+  StyleGuide: '#hash-key'
+  Enabled: false
+
+Style/Documentation:
+  Description: 'Document classes and non-namespace modules.'
+  Enabled: false
+
+Style/DoubleNegation:
+  Description: 'Checks for uses of double negation (!!).'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#no-bang-bang'
+  Enabled: false
+
+Style/EachWithObject:
+  Description: 'Prefer `each_with_object` over `inject` or `reduce`.'
+  Enabled: false
+
+Style/EmptyLiteral:
+  Description: 'Prefer literals to Array.new/Hash.new/String.new.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#literal-array-hash'
+  Enabled: false
+
+# Checks whether the source file has a utf-8 encoding comment or not
+# AutoCorrectEncodingComment must match the regex
+# /#.*coding\s?[:=]\s?(?:UTF|utf)-8/
+Style/Encoding:
+  Enabled: false
+
+Style/EvenOdd:
+  Description: 'Favor the use of Fixnum#even? && Fixnum#odd?'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#predicate-methods'
+  Enabled: false
+
+Naming/FileName:
+  Description: 'Use snake_case for source file names.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#snake-case-files'
+  Enabled: false
+
+Style/FrozenStringLiteralComment:
+  Description: >-
+    Add the frozen_string_literal comment to the top of files
+    to help transition from Ruby 2.3.0 to Ruby 3.0.
+  Enabled: false
+
+Style/FlipFlop:
+  Description: 'Checks for flip flops'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#no-flip-flops'
+  Enabled: false
+
+Style/FormatString:
+  Description: 'Enforce the use of Kernel#sprintf, Kernel#format or String#%.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#sprintf'
+  Enabled: false
+
+Style/GlobalVars:
+  Description: 'Do not introduce global variables.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#instance-vars'
+  Reference: 'http://www.zenspider.com/Languages/Ruby/QuickRef.html'
+  Enabled: false
+
+Style/GuardClause:
+  Description: 'Check for conditionals that can be replaced with guard clauses'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#no-nested-conditionals'
+  Enabled: false
+
+Style/IfUnlessModifier:
+  Description: >-
+                 Favor modifier if/unless usage when you have a
+                 single-line body.
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#if-as-a-modifier'
+  Enabled: false
+
+Style/IfWithSemicolon:
+  Description: 'Do not use if x; .... Use the ternary operator instead.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#no-semicolon-ifs'
+  Enabled: false
+
+Style/InlineComment:
+  Description: 'Avoid inline comments.'
+  Enabled: false
+
+Style/Lambda:
+  Description: 'Use the new lambda literal syntax for single-line blocks.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#lambda-multi-line'
+  Enabled: false
+
+Style/LambdaCall:
+  Description: 'Use lambda.call(...) instead of lambda.(...).'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#proc-call'
+  Enabled: false
+
+Style/LineEndConcatenation:
+  Description: >-
+                 Use \ instead of + or << to concatenate two string literals at
+                 line end.
+  Enabled: false
+
+Metrics/MethodLength:
+  Description: 'Avoid methods longer than 10 lines of code.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#short-methods'
+  Enabled: false
+
+Style/ModuleFunction:
+  Description: 'Checks for usage of `extend self` in modules.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#module-function'
+  Enabled: false
+
+Style/MultilineBlockChain:
+  Description: 'Avoid multi-line chains of blocks.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#single-line-blocks'
+  Enabled: false
+
+Style/NegatedIf:
+  Description: >-
+                 Favor unless over if for negative conditions
+                 (or control flow or).
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#unless-for-negatives'
+  Enabled: false
+
+Style/NegatedWhile:
+  Description: 'Favor until over while for negative conditions.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#until-for-negatives'
+  Enabled: false
+
+Style/Next:
+  Description: 'Use `next` to skip iteration instead of a condition at the end.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#no-nested-conditionals'
+  Enabled: false
+
+Style/NilComparison:
+  Description: 'Prefer x.nil? to x == nil.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#predicate-methods'
+  Enabled: false
+
+Style/Not:
+  Description: 'Use ! instead of not.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#bang-not-not'
+  Enabled: false
+
+Style/NumericLiterals:
+  Description: >-
+                 Add underscores to large numeric literals to improve their
+                 readability.
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#underscores-in-numerics'
+  Enabled: false
+
+Style/OneLineConditional:
+  Description: >-
+                 Favor the ternary operator(?:) over
+                 if/then/else/end constructs.
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#ternary-operator'
+  Enabled: false
+
+Naming/BinaryOperatorParameterName:
+  Description: 'When defining binary operators, name the argument other.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#other-arg'
+  Enabled: false
+
+Metrics/ParameterLists:
+  Description: 'Avoid parameter lists longer than three or four parameters.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#too-many-params'
+  Enabled: false
+
+Style/PercentLiteralDelimiters:
+  Description: 'Use `%`-literal delimiters consistently'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#percent-literal-braces'
+  Enabled: false
+
+Style/PerlBackrefs:
+  Description: 'Avoid Perl-style regex back references.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#no-perl-regexp-last-matchers'
+  Enabled: false
+
+Naming/PredicateName:
+  Description: 'Check the names of predicate methods.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#bool-methods-qmark'
+  NamePrefixBlacklist:
+    - is_
+  Exclude:
+    - spec/**/*
+
+Style/Proc:
+  Description: 'Use proc instead of Proc.new.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#proc'
+  Enabled: false
+
+Style/RaiseArgs:
+  Description: 'Checks the arguments passed to raise/fail.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#exception-class-messages'
+  Enabled: false
+
+Style/RegexpLiteral:
+  Description: 'Use / or %r around regular expressions.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#percent-r'
+  Enabled: false
+
+Style/SelfAssignment:
+  Description: >-
+                 Checks for places where self-assignment shorthand should have
+                 been used.
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#self-assignment'
+  Enabled: false
+
+Style/SingleLineBlockParams:
+  Description: 'Enforces the names of some block params.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#reduce-blocks'
+  Enabled: false
+
+Style/SingleLineMethods:
+  Description: 'Avoid single-line methods.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#no-single-line-methods'
+  Enabled: false
+
+Style/SignalException:
+  Description: 'Checks for proper usage of fail and raise.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#fail-method'
+  Enabled: false
+
+Style/SpecialGlobalVars:
+  Description: 'Avoid Perl-style global variables.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#no-cryptic-perlisms'
+  Enabled: false
+
+Style/StringLiterals:
+  Description: 'Checks if uses of quotes match the configured preference.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#consistent-string-literals'
+  EnforcedStyle: double_quotes
+  Enabled: true
+
+Style/TrailingCommaInArguments:
+  Description: 'Checks for trailing comma in argument lists.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#no-trailing-array-commas'
+  EnforcedStyleForMultiline: comma
+  SupportedStylesForMultiline:
+    - comma
+    - consistent_comma
+    - no_comma
+  Enabled: true
+
+Style/TrailingCommaInArrayLiteral:
+  Description: 'Checks for trailing comma in array literals.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#no-trailing-array-commas'
+  EnforcedStyleForMultiline: comma
+  SupportedStylesForMultiline:
+    - comma
+    - consistent_comma
+    - no_comma
+  Enabled: true
+
+Style/TrailingCommaInHashLiteral:
+  Description: 'Checks for trailing comma in hash literals.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#no-trailing-array-commas'
+  EnforcedStyleForMultiline: comma
+  SupportedStylesForMultiline:
+    - comma
+    - consistent_comma
+    - no_comma
+  Enabled: true
+
+Style/TrivialAccessors:
+  Description: 'Prefer attr_* methods to trivial readers/writers.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#attr_family'
+  Enabled: false
+
+Style/VariableInterpolation:
+  Description: >-
+                 Don't interpolate global, instance and class variables
+                 directly in strings.
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#curlies-interpolate'
+  Enabled: false
+
+Style/WhenThen:
+  Description: 'Use when x then ... for one-line cases.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#one-line-cases'
+  Enabled: false
+
+Style/WhileUntilModifier:
+  Description: >-
+                 Favor modifier while/until usage when you have a
+                 single-line body.
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#while-as-a-modifier'
+  Enabled: false
+
+Style/WordArray:
+  Description: 'Use %w or %W for arrays of words.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#percent-w'
+  Enabled: false
+
+# Layout
+
+Layout/AlignParameters:
+  Description: 'Here we check if the parameters on a multi-line method call or definition are aligned.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#no-double-indent'
+  Enabled: false
+
+Layout/ConditionPosition:
+  Description: >-
+                 Checks for condition placed in a confusing position relative to
+                 the keyword.
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#same-line-condition'
+  Enabled: false
+
+Layout/DotPosition:
+  Description: 'Checks the position of the dot in multi-line method calls.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#consistent-multi-line-chains'
+  EnforcedStyle: trailing
+
+Layout/ExtraSpacing:
+  Description: 'Do not use unnecessary spacing.'
+  Enabled: true
+
+Layout/MultilineOperationIndentation:
+  Description: >-
+                 Checks indentation of binary operations that span more than
+                 one line.
+  Enabled: true
+  EnforcedStyle: indented
+
+Layout/MultilineMethodCallIndentation:
+  Description: >-
+                 Checks indentation of method calls with the dot operator
+                 that span more than one line.
+  Enabled: true
+  EnforcedStyle: indented
+
+Layout/InitialIndentation:
+  Description: >-
+    Checks the indentation of the first non-blank non-comment line in a file.
+  Enabled: false
+
+# Lint
+
+Lint/AmbiguousOperator:
+  Description: >-
+                 Checks for ambiguous operators in the first argument of a
+                 method invocation without parentheses.
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#parens-as-args'
+  Enabled: false
+
+Lint/AmbiguousRegexpLiteral:
+  Description: >-
+                 Checks for ambiguous regexp literals in the first argument of
+                 a method invocation without parenthesis.
+  Enabled: false
+
+Lint/AssignmentInCondition:
+  Description: "Don't use assignment in conditions."
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#safe-assignment-in-condition'
+  Enabled: false
+
+Lint/CircularArgumentReference:
+  Description: "Don't refer to the keyword argument in the default value."
+  Enabled: false
+
+Lint/DeprecatedClassMethods:
+  Description: 'Check for deprecated class method calls.'
+  Enabled: false
+
+Lint/DuplicatedKey:
+  Description: 'Check for duplicate keys in hash literals.'
+  Enabled: false
+
+Lint/EachWithObjectArgument:
+  Description: 'Check for immutable argument given to each_with_object.'
+  Enabled: false
+
+Lint/ElseLayout:
+  Description: 'Check for odd code arrangement in an else block.'
+  Enabled: false
+
+Lint/FormatParameterMismatch:
+  Description: 'The number of parameters to format/sprint must match the fields.'
+  Enabled: false
+
+Lint/HandleExceptions:
+  Description: "Don't suppress exception."
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#dont-hide-exceptions'
+  Enabled: false
+
+Lint/LiteralAsCondition:
+  Description: 'Checks of literals used in conditions.'
+  Enabled: false
+
+Lint/LiteralInInterpolation:
+  Description: 'Checks for literals used in interpolation.'
+  Enabled: false
+
+Lint/Loop:
+  Description: >-
+                 Use Kernel#loop with break rather than begin/end/until or
+                 begin/end/while for post-loop tests.
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#loop-with-break'
+  Enabled: false
+
+Lint/NestedMethodDefinition:
+  Description: 'Do not use nested method definitions.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#no-nested-methods'
+  Enabled: false
+
+Lint/NonLocalExitFromIterator:
+  Description: 'Do not use return in iterator to cause non-local exit.'
+  Enabled: false
+
+Lint/ParenthesesAsGroupedExpression:
+  Description: >-
+                 Checks for method calls with a space before the opening
+                 parenthesis.
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#parens-no-spaces'
+  Enabled: false
+
+Lint/RequireParentheses:
+  Description: >-
+                 Use parentheses in the method call to avoid confusion
+                 about precedence.
+  Enabled: false
+
+Lint/UnderscorePrefixedVariableName:
+  Description: 'Do not use prefix `_` for a variable that is used.'
+  Enabled: false
+
+Lint/UnneededCopDisableDirective:
+  Description: >-
+                 Checks for rubocop:disable comments that can be removed.
+                 Note: this cop is not disabled when disabling all cops.
+                 It must be explicitly disabled.
+  Enabled: false
+
+Lint/Void:
+  Description: 'Possible use of operator/literal/variable in void context.'
+  Enabled: false
+
+# Performance
+
+Performance/CaseWhenSplat:
+  Description: >-
+                  Place `when` conditions that use splat at the end
+                  of the list of `when` branches.
+  Enabled: false
+
+Performance/Count:
+  Description: >-
+                  Use `count` instead of `select...size`, `reject...size`,
+                  `select...count`, `reject...count`, `select...length`,
+                  and `reject...length`.
+  Enabled: false
+
+Performance/Detect:
+  Description: >-
+                  Use `detect` instead of `select.first`, `find_all.first`,
+                  `select.last`, and `find_all.last`.
+  Reference: 'https://github.com/JuanitoFatas/fast-ruby#enumerabledetect-vs-enumerableselectfirst-code'
+  Enabled: false
+
+Performance/FlatMap:
+  Description: >-
+                  Use `Enumerable#flat_map`
+                  instead of `Enumerable#map...Array#flatten(1)`
+                  or `Enumberable#collect..Array#flatten(1)`
+  Reference: 'https://github.com/JuanitoFatas/fast-ruby#enumerablemaparrayflatten-vs-enumerableflat_map-code'
+  Enabled: false
+
+Performance/ReverseEach:
+  Description: 'Use `reverse_each` instead of `reverse.each`.'
+  Reference: 'https://github.com/JuanitoFatas/fast-ruby#enumerablereverseeach-vs-enumerablereverse_each-code'
+  Enabled: false
+
+Performance/Sample:
+  Description: >-
+                  Use `sample` instead of `shuffle.first`,
+                  `shuffle.last`, and `shuffle[Fixnum]`.
+  Reference: 'https://github.com/JuanitoFatas/fast-ruby#arrayshufflefirst-vs-arraysample-code'
+  Enabled: false
+
+Performance/Size:
+  Description: >-
+                  Use `size` instead of `count` for counting
+                  the number of elements in `Array` and `Hash`.
+  Reference: 'https://github.com/JuanitoFatas/fast-ruby#arraycount-vs-arraysize-code'
+  Enabled: false
+
+Performance/StringReplacement:
+  Description: >-
+                  Use `tr` instead of `gsub` when you are replacing the same
+                  number of characters. Use `delete` instead of `gsub` when
+                  you are deleting characters.
+  Reference: 'https://github.com/JuanitoFatas/fast-ruby#stringgsub-vs-stringtr-code'
+  Enabled: false
+
+# Rails
+
+Rails/ActionFilter:
+  Description: 'Enforces consistent use of action filter methods.'
+  Enabled: false
+
+Rails/Date:
+  Description: >-
+                  Checks the correct usage of date aware methods,
+                  such as Date.today, Date.current etc.
+  Enabled: false
+
+Rails/FindBy:
+  Description: 'Prefer find_by over where.first.'
+  Enabled: false
+
+Rails/FindEach:
+  Description: 'Prefer all.find_each over all.find.'
+  Enabled: false
+
+Rails/HasAndBelongsToMany:
+  Description: 'Prefer has_many :through to has_and_belongs_to_many.'
+  Enabled: false
+
+Rails/Output:
+  Description: 'Checks for calls to puts, print, etc.'
+  Enabled: false
+
+Rails/ReadWriteAttribute:
+  Description: >-
+                 Checks for read_attribute(:attr) and
+                 write_attribute(:attr, val).
+  Enabled: false
+
+Rails/ScopeArgs:
+  Description: 'Checks the arguments of ActiveRecord scopes.'
+  Enabled: false
+
+Rails/TimeZone:
+  Description: 'Checks the correct usage of time zone aware methods.'
+  StyleGuide: 'https://github.com/bbatsov/rails-style-guide#time'
+  Reference: 'http://danilenko.org/2012/7/6/rails_timezones'
+  Enabled: false
+
+Rails/Validation:
+  Description: 'Use validates :attribute, hash of validations.'
+  Enabled: false
diff --git a/Gemfile b/Gemfile
index 7525581..6db9e9a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,8 +1,7 @@
 source "https://rubygems.org"
 
-git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
+git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
 
 # Specify your gem's dependencies in parameter_store_loader.gemspec
 gemspec name: "psenv"
 gemspec name: "psenv-rails"
-
diff --git a/Gemfile.lock b/Gemfile.lock
index 090688d..834aaf3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -30,6 +30,7 @@ GEM
       tzinfo (~> 1.1)
     addressable (2.5.2)
       public_suffix (>= 2.0.2, < 4.0)
+    ast (2.4.0)
     aws-partitions (1.71.0)
     aws-sdk-core (3.17.1)
       aws-partitions (~> 1.0)
@@ -58,6 +59,10 @@ GEM
     minitest (5.11.3)
     nokogiri (1.8.2)
       mini_portile2 (~> 2.3.0)
+    parallel (1.12.1)
+    parser (2.5.0.5)
+      ast (~> 2.4.0)
+    powerpack (0.1.1)
     public_suffix (3.0.2)
     rack (2.0.4)
     rack-test (0.8.3)
@@ -73,6 +78,7 @@ GEM
       method_source
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
+    rainbow (3.0.0)
     rake (10.5.0)
     rspec (3.7.0)
       rspec-core (~> 3.7.0)
@@ -87,11 +93,20 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.7.0)
     rspec-support (3.7.1)
+    rubocop (0.54.0)
+      parallel (~> 1.10)
+      parser (>= 2.5)
+      powerpack (~> 0.1)
+      rainbow (>= 2.2.2, < 4.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (~> 1.0, >= 1.0.1)
+    ruby-progressbar (1.9.0)
     safe_yaml (1.0.4)
     thor (0.20.0)
     thread_safe (0.3.6)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
+    unicode-display_width (1.3.0)
     webmock (3.3.0)
       addressable (>= 2.3.6)
       crack (>= 0.3.2)
@@ -106,6 +121,7 @@ DEPENDENCIES
   psenv-rails!
   rake (~> 10.0)
   rspec (~> 3.0)
+  rubocop (= 0.54)
   webmock (~> 3.3)
 
 BUNDLED WITH
diff --git a/Rakefile b/Rakefile
index c1e9fa1..688a290 100644
--- a/Rakefile
+++ b/Rakefile
@@ -7,9 +7,9 @@ end
 
 namespace "psenv-rails" do
   class ParameterStoreEnvRailsGemHelper < Bundler::GemHelper
-    def guard_already_tagged; end # noop
+    def guard_already_tagged; end
 
-    def tag_version; end # noop
+    def tag_version; end
   end
 
   ParameterStoreEnvRailsGemHelper.install_tasks name: "psenv-rails"
@@ -21,4 +21,4 @@ task release: ["psenv:release", "psenv-rails:release"]
 
 RSpec::Core::RakeTask.new(:spec)
 
-task :default => :spec
+task default: :spec
diff --git a/lib/psenv/version.rb b/lib/psenv/version.rb
index 5073514..3578d5e 100644
--- a/lib/psenv/version.rb
+++ b/lib/psenv/version.rb
@@ -1,3 +1,3 @@
 module Psenv
-  VERSION = "0.0.1"
+  VERSION = "0.0.1".freeze
 end
diff --git a/psenv-rails.gemspec b/psenv-rails.gemspec
index 88bd0c0..c513825 100644
--- a/psenv-rails.gemspec
+++ b/psenv-rails.gemspec
@@ -1,5 +1,5 @@
 
-lib = File.expand_path("../lib", __FILE__)
+lib = File.expand_path("lib", __dir__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require "psenv/version"
 
@@ -9,7 +9,7 @@ Gem::Specification.new do |spec|
   spec.authors       = ["Andrew Tomaka"]
   spec.email         = ["atomaka@gmail.com"]
 
-  spec.summary       = %q{Load AWS SSM Parameter Store values into your Rails environment.}
+  spec.summary       = "Load AWS SSM Parameter Store values into your Rails environment."
   spec.homepage      = "https://github.com/atomaka/psenv"
   spec.license       = "MIT"
 
diff --git a/psenv.gemspec b/psenv.gemspec
index 04455d4..c460ddc 100644
--- a/psenv.gemspec
+++ b/psenv.gemspec
@@ -1,5 +1,5 @@
 
-lib = File.expand_path("../lib", __FILE__)
+lib = File.expand_path("lib", __dir__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require "psenv/version"
 
@@ -9,7 +9,7 @@ Gem::Specification.new do |spec|
   spec.authors       = ["Andrew Tomaka"]
   spec.email         = ["atomaka@gmail.com"]
 
-  spec.summary       = %q{Load AWS SSM Parameter Store values into your environment.}
+  spec.summary       = "Load AWS SSM Parameter Store values into your environment."
   spec.homepage      = "https://github.com/atomaka/psenv"
   spec.license       = "MIT"
 
@@ -23,6 +23,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "bundler", "~> 1.16"
   spec.add_development_dependency "rake", "~> 10.0"
   spec.add_development_dependency "rspec", "~> 3.0"
+  spec.add_development_dependency "rubocop", "0.54"
   spec.add_development_dependency "webmock", "~> 3.3"
 
   spec.add_dependency "aws-sdk-ssm", "~> 1"
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 056b0a9..6d585f9 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,5 +1,5 @@
 require "bundler/setup"
-require 'webmock/rspec'
+require "webmock/rspec"
 require "psenv"
 
 WebMock.disable_net_connect!(allow_localhost: true)