diff --git a/Library/.rubocop.yml b/Library/.rubocop.yml
index 039f51d835..a3e2800eba 100644
--- a/Library/.rubocop.yml
+++ b/Library/.rubocop.yml
@@ -10,6 +10,14 @@ Style/StringLiterals:
 Style/StringLiteralsInInterpolation:
     EnforcedStyle: double_quotes
 
+# percent-x is allowed for multiline
+Style/CommandLiteral:
+    EnforcedStyle: mixed
+
+# paths abound, easy escape
+Style/RegexpLiteral:
+    EnforcedStyle: slashes
+
 # no metrics for formulas
 Metrics/AbcSize:
     Enabled: false
@@ -48,10 +56,6 @@ Style/EmptyLineBetweenDefs:
 Style/NumericLiterals:
     Enabled: false
 
-# paths abound, easy escape
-Style/RegexpLiteral:
-    MaxSlashes: 0
-
 # consistency and readability when faced with string interpolation
 Style/PercentLiteralDelimiters:
     PreferredDelimiters:
@@ -101,12 +105,6 @@ Style/WordArray:
 Style/UnneededCapitalW:
     Enabled: false
 
-# percent-x is allowed for multiline
-# TODO: enforce when rubocop has fixed this
-# https://github.com/bbatsov/rubocop/issues/1397
-Style/UnneededPercentX:
-    Enabled: false
-
 # TODO: rubocop bug regarding __END__
 # see https://github.com/bbatsov/rubocop/issues/1541
 Style/TrailingWhitespace: