diff --git a/.rubocop.yml b/.rubocop.yml
index 802a6e6..2e32511 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,5 +1,8 @@
 inherit_from: ./config/default.yml
 
+require:
+  - rubocop-performance
+
 Naming/FileName:
   Enabled: true
   Exclude:
diff --git a/.travis.yml b/.travis.yml
index 9497859..b224c41 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,7 +6,7 @@ git:
   depth: 10
 
 rvm:
-  - 2.3.8
   - 2.4.6
   - 2.5.5
   - 2.6.3
+  - 2.7.1
diff --git a/Gemfile b/Gemfile
index bb94df8..8093046 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,3 +2,5 @@
 
 source "https://rubygems.org"
 gemspec
+
+gem "rubocop-performance", require: false
diff --git a/config/_default_shared.yml b/config/_default_shared.yml
index 5f6b42a..d20e7b6 100644
--- a/config/_default_shared.yml
+++ b/config/_default_shared.yml
@@ -26,9 +26,15 @@ Layout/EndAlignment:
 Layout/EndOfLine:
   Enabled: true
 
+Layout/IndentationStyle:
+  Enabled: true
+
 Layout/InitialIndentation:
   Enabled: true
 
+Layout/LineLength:
+  Enabled: false
+
 Layout/SpaceAfterColon:
   Enabled: true
 
@@ -72,9 +78,6 @@ Layout/SpaceInsideRangeLiteral:
 Layout/SpaceInsideReferenceBrackets:
   Enabled: true
 
-Layout/Tab:
-  Enabled: true
-
 Layout/TrailingEmptyLines:
   Enabled: true
 
@@ -108,9 +111,6 @@ Lint/EmptyEnsure:
 Lint/EmptyInterpolation:
   Enabled: true
 
-Lint/EndInMethod:
-  Enabled: true
-
 Lint/EnsureReturn:
   Enabled: true
 
@@ -183,9 +183,6 @@ Metrics/ClassLength:
 Metrics/CyclomaticComplexity:
   Enabled: false
 
-Metrics/LineLength:
-  Enabled: false
-
 Metrics/MethodLength:
   Enabled: false