diff --git a/BartyCrouch.podspec b/BartyCrouch.podspec
index 924cea2..d6b8a16 100644
--- a/BartyCrouch.podspec
+++ b/BartyCrouch.podspec
@@ -1,7 +1,7 @@
 Pod::Spec.new do |s|
 
   s.name         = "BartyCrouch"
-  s.version      = "4.14.2"
+  s.version      = "4.15.0"
   s.summary      = "Localization/I18n: Incrementally update/translate your Strings files from .swift, .h, .m(m), .storyboard or .xib files."
 
   s.description  = <<-DESC
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8222b43..15a1284 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -31,6 +31,13 @@ If needed, pluralize to `Tasks`, `PRs` or `Authors` and list multiple entries se
 ### Security
 - None.
 
+## [4.15.0] - 2023-05-22
+### Changed
+- Improved implementation of DeepL API client for more reliable escaping than the previous manual escaping logic.  
+  PR: [#277](https://github.com/FlineDev/BartyCrouch/issues/277) | Author: [Nico](https://github.com/NickAtGit)
+- Upgraded Swift-Syntax dependency to work with Swift 5.8 to fix build issues.
+  PR: [#279](https://github.com/FlineDev/BartyCrouch/issues/279) | Author: [Alex Deem](https://github.com/alexdeem)
+
 ## [4.14.0] - 2022-12-14
 ### Added
 - Support for Swift 5.7 and Xcode 14, dropping support for older versions and fixing the 'could not parse syntax tree' issue.
diff --git a/Package.swift b/Package.swift
index 1b92697..7846816 100644
--- a/Package.swift
+++ b/Package.swift
@@ -17,7 +17,7 @@ let package = Package(
     .package(name: "Rainbow", url: "https://github.com/onevcat/Rainbow.git", from: "3.1.5"),
     .package(name: "SwiftCLI", url: "https://github.com/jakeheis/SwiftCLI.git", from: "6.0.3"),
     .package(name: "Toml", url: "https://github.com/jdfergason/swift-toml.git", .branch("master")),
-    .package(url: "https://github.com/apple/swift-syntax.git", .branch("0.50700.1")),
+    .package(url: "https://github.com/apple/swift-syntax.git", from: "508.0.0"),
 
     // A collection of tools for debugging, diffing, and testing your application's data structures.
     .package(url: "https://github.com/pointfreeco/swift-custom-dump.git", from: "0.3.0"),
diff --git a/Sources/BartyCrouch/main.swift b/Sources/BartyCrouch/main.swift
index b680607..08df412 100644
--- a/Sources/BartyCrouch/main.swift
+++ b/Sources/BartyCrouch/main.swift
@@ -5,7 +5,7 @@ import SwiftCLI
 // MARK: - CLI
 let cli = CLI(
   name: "bartycrouch",
-  version: "4.14.2",
+  version: "4.15.0",
   description: "Incrementally update & translate your Strings files from code or interface files."
 )
 
diff --git a/Sources/BartyCrouchKit/FileHandling/SupportedLanguagesReader.swift b/Sources/BartyCrouchKit/FileHandling/SupportedLanguagesReader.swift
index 539bff3..2c08d89 100644
--- a/Sources/BartyCrouchKit/FileHandling/SupportedLanguagesReader.swift
+++ b/Sources/BartyCrouchKit/FileHandling/SupportedLanguagesReader.swift
@@ -10,6 +10,7 @@ class SupportedLanguagesReader: SyntaxVisitor {
     typeName: String
   ) {
     self.typeName = typeName
+    super.init(viewMode: .sourceAccurate)
   }
 
   override func visit(_ enumDeclaration: EnumDeclSyntax) -> SyntaxVisitorContinueKind {
diff --git a/Sources/BartyCrouchTranslator/DeeplApi/DeepLApi.swift b/Sources/BartyCrouchTranslator/DeeplApi/DeepLApi.swift
index eb8e607..b6a98c4 100644
--- a/Sources/BartyCrouchTranslator/DeeplApi/DeepLApi.swift
+++ b/Sources/BartyCrouchTranslator/DeeplApi/DeepLApi.swift
@@ -57,13 +57,24 @@ extension DeepLApi: Endpoint {
   var method: HttpMethod {
     switch self {
     case .translate(let texts, let sourceLanguage, let targetLanguage, let authKey):
-      let textEntries = texts.map { "text=\($0.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)!)" }
-        .joined(separator: "&")
-      let authKeyEntry = "auth_key=\(authKey)"
-      let sourceLanguageEntry = "source_lang=\(sourceLanguage.deepLParameterValue)"
-      let targetLanguageEntry = "target_lang=\(targetLanguage.deepLParameterValue)"
-      let bodyString = [authKeyEntry, sourceLanguageEntry, targetLanguageEntry, textEntries].joined(separator: "&")
-      return .post(body: bodyString.data(using: .utf8)!)
+      
+      let authKeyItem = URLQueryItem(name: "auth_key", value: authKey)
+      let textItems = texts.map { URLQueryItem(name: "text", value: $0) }
+      let targetLangItem = URLQueryItem(name: "target_lang", value: targetLanguage.deepLParameterValue)
+      let sourceLangItem = URLQueryItem(name: "source_lang", value: sourceLanguage.deepLParameterValue)
+      
+      var components = URLComponents()
+      components.queryItems = ([authKeyItem, targetLangItem, sourceLangItem] + textItems).compactMap { $0 }
+      
+      guard var queryItemsString = components.string else {
+          fatalError("Invalid arguments.")
+      }
+      // queryItemsString starts with a ? but post API expects the query string without leading ?
+      if queryItemsString.hasPrefix("?") {
+        queryItemsString.removeFirst()
+      }
+                
+      return .post(body: queryItemsString.data(using: .utf8)!)
     }
   }
 
diff --git a/Sources/SupportingFiles/Info.plist b/Sources/SupportingFiles/Info.plist
index 74175bc..a4e2747 100644
--- a/Sources/SupportingFiles/Info.plist
+++ b/Sources/SupportingFiles/Info.plist
@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>4.14.2</string>
+	<string>4.15.0</string>
 	<key>CFBundleVersion</key>
 	<string>$(CURRENT_PROJECT_VERSION)</string>
 	<key>NSHumanReadableCopyright</key>
diff --git a/Tests/BartyCrouchTranslatorTests/DeepLTranslatorApiTests.swift b/Tests/BartyCrouchTranslatorTests/DeepLTranslatorApiTests.swift
index 4f8c4f8..e5fcb27 100644
--- a/Tests/BartyCrouchTranslatorTests/DeepLTranslatorApiTests.swift
+++ b/Tests/BartyCrouchTranslatorTests/DeepLTranslatorApiTests.swift
@@ -20,6 +20,7 @@ class DeepLTranslatorApiTests: XCTestCase {
     switch apiProvider.performRequestAndWait(on: endpoint, decodeBodyTo: DeepLTranslateResponse.self) {
     case let .success(translateResponses):
       XCTAssertEqual(translateResponses.translations[0].text, "Wie alt sind Sie?")
+      XCTAssertEqual(translateResponses.translations[1].text, "Liebe")
 
     case let .failure(failure):
       XCTFail(failure.localizedDescription)