diff --git a/Package.swift b/Package.swift
index b81406c..e4bc41d 100644
--- a/Package.swift
+++ b/Package.swift
@@ -16,7 +16,7 @@ let package = Package(
         .package(name: "SwiftRegularExpression", url: "https://github.com/nerzh/swift-regular-expression.git", .upToNextMajor(from: "0.2.4")),
         .package(name: "FileUtils", url: "https://github.com/nerzh/SwiftFileUtils", .upToNextMinor(from: "1.3.0")),
         .package(name: "BigInt", url: "https://github.com/bytehubio/BigInt", .exact("5.3.0")),
-        .package(name: "SwiftExtensionsPack", url: "https://github.com/nerzh/swift-extensions-pack", .upToNextMinor(from: "1.2.0")),
+        .package(name: "SwiftExtensionsPack", url: "https://github.com/nerzh/swift-extensions-pack", .upToNextMinor(from: "1.3.1")),
     ],
     targets: [
         .systemLibrary(name: "CTonSDK", pkgConfig: "libton_client"),
diff --git a/Sources/EverscaleClientSwift/Client/ClientTypes.swift b/Sources/EverscaleClientSwift/Client/ClientTypes.swift
index b3c2cd8..54cb86f 100644
--- a/Sources/EverscaleClientSwift/Client/ClientTypes.swift
+++ b/Sources/EverscaleClientSwift/Client/ClientTypes.swift
@@ -60,7 +60,7 @@ public struct TSDKClientError: Codable, LocalizedError {
     public var failureReason: String? { self.message }
     public var recoverySuggestion: String? { self.message }
     public var helpAnchor: String? { self.message }
-    public var data: AnyValue = ([:] as! [String: Any]).toAnyValue()
+    public var data: AnyValue = [String: Any]().toAnyValue()
 
     public init(_ error: Error) {
         self.code = 0
diff --git a/Sources/EverscaleClientSwift/Extensions/String.swift b/Sources/EverscaleClientSwift/Extensions/String.swift
deleted file mode 100644
index f81caa6..0000000
--- a/Sources/EverscaleClientSwift/Extensions/String.swift
+++ /dev/null
@@ -1,48 +0,0 @@
-//
-//  Created by Oleh Hudeichuk on 18.10.2020.
-//
-
-import Foundation
-
-public extension String {
-    
-    func bytes(_ using: Encoding = .utf8) -> Int {
-        self.data(using: using)?.count ?? 0
-    }
-    
-    // TO DECODABLE STRUCT
-    func toModel<T>(_ model: T.Type) -> T? where T : Decodable {
-        guard let data = self.data(using: String.Encoding.utf8) else { return nil }
-        return try? JSONDecoder().decode(model, from: data)
-    }
-    
-    func getPointer<T>(_ handler: (_ pointer: UnsafePointer<T>, _ len: Int) throws -> Void) rethrows {
-        var string = self
-        try string.withUTF8 { (p: UnsafeBufferPointer<UInt8>) in
-            try p.baseAddress?.withMemoryRebound(to: T.self, capacity: p.count) { (p2: UnsafePointer<T>) in
-                try handler(p2, p.count)
-            }
-        }
-    }
-    
-    func base64Encoded() -> String? {
-        if let data = self.data(using: .utf8) {
-            return data.base64EncodedString()
-        }
-        return nil
-    }
-    
-    func base64Decoded() -> String? {
-        if let data = Data(base64Encoded: self, options: .ignoreUnknownCharacters) {
-            return String(data: data, encoding: .utf8)
-        }
-        return nil
-    }
-    
-    func isBase64() -> Bool {
-        if let encoded = self.base64Decoded()?.base64Encoded() {
-            return encoded.trimmingCharacters(in: .whitespacesAndNewlines) == self
-        }
-        return false
-    }
-}
diff --git a/Tests/EverscaleClientSwiftTests/BindingTests.swift b/Tests/EverscaleClientSwiftTests/BindingTests.swift
index 7d3f825..47e519f 100644
--- a/Tests/EverscaleClientSwiftTests/BindingTests.swift
+++ b/Tests/EverscaleClientSwiftTests/BindingTests.swift
@@ -11,7 +11,7 @@ import class Foundation.Bundle
 final class BindingTests: XCTestCase {
 
     func testConvertToTSDKString() throws {
-        var string: TSDKString = .init()
+        var string: tc_string_data_t!
         try TSDKBindingModule.convertToTSDKString("Hello😀") { tsdkString in
             string = tsdkString
         }