diff --git a/CHANGELOG.md b/CHANGELOG.md
index a356e0c..3f84784 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 ### Unreleased
 
+### 0.13.2
++ Fix swift 4 warnings about String.characters
+
 ## 0.13.1
 + Swift 4
 
diff --git a/Example/Tests/StringGherkinExtensionTests.swift b/Example/Tests/StringGherkinExtensionTests.swift
index 99c0732..7eecd07 100644
--- a/Example/Tests/StringGherkinExtensionTests.swift
+++ b/Example/Tests/StringGherkinExtensionTests.swift
@@ -61,5 +61,4 @@ class StringGherkinExtensionTests: XCTestCase {
         let simpleString = ""
         XCTAssertEqual("", simpleString.camelCaseify)
     }
-    
 }
diff --git a/Pod/Core/StringGherkinExtension.swift b/Pod/Core/StringGherkinExtension.swift
index be4bd8b..ee63fc9 100644
--- a/Pod/Core/StringGherkinExtension.swift
+++ b/Pod/Core/StringGherkinExtension.swift
@@ -18,7 +18,7 @@ public extension String {
     */
     var camelCaseify: String {
         get {
-            guard case let characters = (self.characters.split { $0 == " " || $0 == "-" }), characters.count > 1 else {
+            guard case let characters = (self.split { $0 == " " || $0 == "-" }), characters.count > 1 else {
                 return self.uppercaseFirstLetterString
             }
             return characters.map { String($0).lowercased().uppercaseFirstLetterString }.joined(separator: "")
@@ -33,8 +33,8 @@ public extension String {
     */
     var uppercaseFirstLetterString: String {
         get {
-            guard case let characters = self.characters, let firstCharacter = characters.first else { return self }
-            return String(firstCharacter).uppercased() + String(characters.dropFirst())
+            guard let firstCharacter = self.first else { return self }
+            return String(firstCharacter).uppercased() + String(self.dropFirst())
         }
     }
     
@@ -45,8 +45,8 @@ public extension String {
      */
     var humanReadableString: String {
         get {
-            guard case let characters = self.characters, characters.count > 1, let firstCharacter = characters.first else { return self }
-            return String(firstCharacter) + characters.dropFirst().reduce("") { (word, character) in
+            guard self.count > 1, let firstCharacter = self.first else { return self }
+            return String(firstCharacter) + self.dropFirst().reduce("") { (word, character) in
                 let letter = String(character)
                 if letter == letter.uppercased() {
                     return word + " " + letter
diff --git a/Pod/Core/XCTestCase+Gherkin.swift b/Pod/Core/XCTestCase+Gherkin.swift
index 527e586..4ced6f0 100644
--- a/Pod/Core/XCTestCase+Gherkin.swift
+++ b/Pod/Core/XCTestCase+Gherkin.swift
@@ -41,15 +41,14 @@ class GherkinState {
     fileprivate var missingStepsImplementations = [String]()
     
     func gherkinStepsAndMatchesMatchingExpression(_ expression: String) -> [(step: Step, match: NSTextCheckingResult)] {
-        let range = NSMakeRange(0, expression.characters.count)
-        let matches = self.steps.map { (step: Step) -> (step: Step, match: NSTextCheckingResult)? in
+        let range = NSMakeRange(0, expression.count)
+        return self.steps.flatMap { (step: Step) -> (step: Step, match: NSTextCheckingResult)? in
             if let match = step.regex.firstMatch(in: expression, options: [], range: range) {
                 return (step:step, match:match)
             } else {
                 return nil
             }
-        }.flatMap { $0 }
-        return matches
+        }
     }
     
     func gherkinStepsMatchingExpression(_ expression: String) -> [Step] {
diff --git a/Pod/Native/NativeFeature.swift b/Pod/Native/NativeFeature.swift
index 20c9746..0c0340b 100644
--- a/Pod/Native/NativeFeature.swift
+++ b/Pod/Native/NativeFeature.swift
@@ -56,7 +56,7 @@ extension NativeFeature {
         var lines = contentsFixedWindowsNewLineCharacters.components(separatedBy: "\n").map { $0.trimmingCharacters(in: whitespace) }
 
         // Filter comments (#) and tags (@), also filter white lines
-        lines = lines.filter { $0.characters.first != "#" &&  $0.characters.first != "@" && $0.characters.count > 0}
+        lines = lines.filter { $0.first != "#" &&  $0.first != "@" && $0.count > 0}
 
         guard lines.count > 0 else { return nil }
         
diff --git a/XCTest-Gherkin.podspec b/XCTest-Gherkin.podspec
index f0a0da6..0e9bacd 100644
--- a/XCTest-Gherkin.podspec
+++ b/XCTest-Gherkin.podspec
@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
   s.name             = "XCTest-Gherkin"
-  s.version          = "0.13.1"
+  s.version          = "0.13.2"
   s.summary          = "Gherkin style tests"
   s.description      = <<-DESC
 Adds Gherkin syntax to XCTestCase