diff --git a/Preprocessor/Preprocessor/main.swift b/Preprocessor/Preprocessor/main.swift
index b8134a87..ece027dd 100644
--- a/Preprocessor/Preprocessor/main.swift
+++ b/Preprocessor/Preprocessor/main.swift
@@ -16,7 +16,7 @@ if Process.argc != 3 {
 let sourceFilesRoot = Process.arguments[1]
 let derivedData = Process.arguments[2]
 
-let fileManager = NSFileManager()
+let fileManager = FileManager()
 
 func escape(value: String) -> String {
     let escapedString = value.replacingOccurrences(of: "\n", with: "\\n")
@@ -27,10 +27,11 @@ func escape(value: String) -> String {
 }
 
 func processFile(path: String, outputPath: String) -> String {
-    let rawContent = NSData(contentsOfFile: path)!
-    let content = NSString(data: rawContent, encoding: NSUTF8StringEncoding)! as String
+    let url = URL(fileURLWithPath: path)
+    let rawContent = try! Data(contentsOf: url)
+    let content = String(data: rawContent, encoding: String.Encoding.utf8)
     
-    let components = content.components(separatedBy: "<%")
+    guard let components = content?.components(separatedBy: "<%") else { return "" }
     
     var functionContentComponents: [String] = []
     functionContentComponents.append("var components: [String] = [\"// This file is autogenerated. Take a look at `Preprocessor` target in RxSwift project \\n\"]\n")
@@ -46,7 +47,7 @@ func processFile(path: String, outputPath: String) -> String {
         let suffix = codePlusSuffixSeparated[1]
         
         if code.hasPrefix("=") {
-            functionContentComponents.append("components.append(String(\(code.substring(from: code.startIndex.successor()))))\n")
+            functionContentComponents.append("components.append(String(\(code.substring(from: code.index(after: code.startIndex)))))\n")
         }
         else {
             functionContentComponents.append("\(code)\n")
@@ -55,15 +56,15 @@ func processFile(path: String, outputPath: String) -> String {
         functionContentComponents.append("components.append(\(escape(value: suffix)));\n")
     }
     
-    functionContentComponents.append("try! components.joinWithSeparator(\"\").writeToFile(\"\(outputPath)\", atomically: false, encoding: NSUTF8StringEncoding)")
+    functionContentComponents.append("try! components.join(withSeparator:\"\").write(toFile:\"\(outputPath)\", atomically: false, encoding: NSUTF8StringEncoding)")
     
     return functionContentComponents.joined(separator: "")
 }
 
 func runCommand(path: String) {
-    _ = NSProcessInfo().processIdentifier
+    _ = ProcessInfo().processIdentifier
     
-    let task = NSTask()
+    let task = Task()
     task.launchPath = "/bin/bash"
     task.arguments = ["-c", "xcrun swift \"\(path)\""]
     
@@ -71,7 +72,7 @@ func runCommand(path: String) {
     
     task.waitUntilExit()
     
-    if task.terminationReason != NSTaskTerminationReason.exit {
+    if task.terminationReason != Task.TerminationReason.exit {
         exit(-1)
     }
 }
@@ -88,8 +89,8 @@ for file in files {
     print(file)
     
     let path = (sourceFilesRoot as NSString).appendingPathComponent(file as String)
-    
-    let outputPath = path.substring(to: path.endIndex.predecessor().predecessor().predecessor()) + ".swift"
+    let endIndex = path.index(before: path.index(before: path.index(before: path.endIndex)))
+    let outputPath = path.substring(to: endIndex) + ".swift"
     
     generateAllFiles.append("_ = { () -> Void in\n\(processFile(path: path, outputPath: outputPath))\n}()\n")
 }
@@ -98,7 +99,7 @@ let script = generateAllFiles.joined(separator: "")
 let scriptPath = (derivedData as NSString).appendingPathComponent("_preprocessor.sh")
 
 do {
-    try script.write(toFile: scriptPath, atomically: true, encoding: NSUTF8StringEncoding)
+    try script.write(toFile: scriptPath, atomically: true, encoding: String.Encoding.utf8)
 } catch _ {
 }
-runCommand(path: scriptPath)
\ No newline at end of file
+runCommand(path: scriptPath)
diff --git a/Tests/PerformanceTests/PerformanceTools.swift b/Tests/PerformanceTests/PerformanceTools.swift
index ef5b3f05..7ea09a70 100644
--- a/Tests/PerformanceTests/PerformanceTools.swift
+++ b/Tests/PerformanceTests/PerformanceTools.swift
@@ -132,7 +132,7 @@ func approxValuePerIteration(_ total: UInt64) -> UInt64 {
     return UInt64(round(Double(total) / Double(NumberOfIterations)))
 }
 
-func measureTime(@noescape _ work: () -> ()) -> UInt64 {
+func measureTime( _ work: @noescape() -> ()) -> UInt64 {
     var timebaseInfo: mach_timebase_info = mach_timebase_info()
     let res = mach_timebase_info(&timebaseInfo)
 
@@ -147,7 +147,7 @@ func measureTime(@noescape _ work: () -> ()) -> UInt64 {
     return approxValuePerIteration(timeInNano) / 1000
 }
 
-func measureMemoryUsage(@noescape _ work: () -> ()) -> (bytesAllocated: UInt64, allocations: UInt64) {
+func measureMemoryUsage( _ work: @noescape() -> ()) -> (bytesAllocated: UInt64, allocations: UInt64) {
     let (bytes, allocations) = getMemoryInfo()
     for _ in 0 ..< NumberOfIterations {
         work()
@@ -159,7 +159,7 @@ func measureMemoryUsage(@noescape _ work: () -> ()) -> (bytesAllocated: UInt64,
 
 var fragmentedMemory = false
 
-func compareTwoImplementations(_ benchmarkTime: Bool, benchmarkMemory: Bool, @noescape first: () -> (), @noescape second: () -> ()) {
+func compareTwoImplementations(_ benchmarkTime: Bool, benchmarkMemory: Bool, first: @noescape() -> (), second: @noescape() -> ()) {
     if !fragmentedMemory {
         print("Fragmenting memory ...")
         fragmentMemory()
diff --git a/Tests/PerformanceTests/main.swift b/Tests/PerformanceTests/main.swift
index b13f873a..aa732093 100644
--- a/Tests/PerformanceTests/main.swift
+++ b/Tests/PerformanceTests/main.swift
@@ -19,7 +19,7 @@ func allocation() {
 }
 
 repeat {
-compareTwoImplementations(benchmarkTime: true, benchmarkMemory: false, first: {
+compareTwoImplementations(true, benchmarkMemory: false, first: {
     let publishSubject = PublishSubject<Int>()
 
     //let a = Observable.just(1)
@@ -55,10 +55,10 @@ compareTwoImplementations(benchmarkTime: true, benchmarkMemory: false, first: {
 
 
     for i in 0..<100 {
-        publishSubject.on(.Next(i))
+        publishSubject.on(.next(i))
     }
 
 }, second: {
     
 })
-} while true
\ No newline at end of file
+} while true