diff --git a/Sources/Ananda/AnandaValueExtractor.swift b/Sources/Ananda/AnandaValueExtractor.swift
index 4c2876a..ef3b5ef 100644
--- a/Sources/Ananda/AnandaValueExtractor.swift
+++ b/Sources/Ananda/AnandaValueExtractor.swift
@@ -11,12 +11,12 @@ public struct AnandaValueExtractor: Sendable {
     /// Standard shared instance
     public static let standard = Self()
 
-    let bool: @Sendable (AnandaJSON) -> Bool?
-    let int: @Sendable (AnandaJSON) -> Int?
-    let double: @Sendable (AnandaJSON) -> Double?
-    let string: @Sendable (AnandaJSON) -> String?
-    let date: @Sendable (AnandaJSON) -> Date?
-    let url: @Sendable (AnandaJSON) -> URL?
+    var bool: @Sendable (AnandaJSON) -> Bool?
+    var int: @Sendable (AnandaJSON) -> Int?
+    var double: @Sendable (AnandaJSON) -> Double?
+    var string: @Sendable (AnandaJSON) -> String?
+    var date: @Sendable (AnandaJSON) -> Date?
+    var url: @Sendable (AnandaJSON) -> URL?
 
     /// Initializer
     /// - Parameters:
@@ -119,6 +119,50 @@ public struct AnandaValueExtractor: Sendable {
     }
 }
 
+extension AnandaValueExtractor {
+    /// Returns updated `Self` with new `bool` extractor.
+    public func updatingBool(_ bool: @Sendable @escaping (AnandaJSON) -> Bool?) -> Self {
+        var result = self
+        result.bool = bool
+        return result
+    }
+
+    /// Returns updated `Self` with new `int` extractor.
+    public func updatingInt(_ int: @Sendable @escaping (AnandaJSON) -> Int?) -> Self {
+        var result = self
+        result.int = int
+        return result
+    }
+
+    /// Returns updated `Self` with new `double` extractor.
+    public func updatingDouble(_ double: @Sendable @escaping (AnandaJSON) -> Double?) -> Self {
+        var result = self
+        result.double = double
+        return result
+    }
+
+    /// Returns updated `Self` with new `string` extractor.
+    public func updatingString(_ string: @Sendable @escaping (AnandaJSON) -> String?) -> Self {
+        var result = self
+        result.string = string
+        return result
+    }
+
+    /// Returns updated `Self` with new `date` extractor.
+    public func updatingDate(_ date: @Sendable @escaping (AnandaJSON) -> Date?) -> Self {
+        var result = self
+        result.date = date
+        return result
+    }
+
+    /// Returns updated `Self` with new `url` extractor.
+    public func updatingURL(_ url: @Sendable @escaping (AnandaJSON) -> URL?) -> Self {
+        var result = self
+        result.url = url
+        return result
+    }
+}
+
 #if os(Linux)
 #if $RetroactiveAttribute
 extension ISO8601DateFormatter: @retroactive @unchecked Sendable {
diff --git a/Tests/AnandaTests/AnandaTests.swift b/Tests/AnandaTests/AnandaTests.swift
index 9846b91..2c855c4 100644
--- a/Tests/AnandaTests/AnandaTests.swift
+++ b/Tests/AnandaTests/AnandaTests.swift
@@ -387,29 +387,25 @@ final class AnandaTests {
                 }
 
                 struct Toot: AnandaModel {
-                    static var valueExtractor: AnandaValueExtractor {
-                        .init(
-                            bool: {
-                                if let bool = $0.originalBool {
-                                    return bool
-                                } else {
-                                    if let int = $0.originalInt {
-                                        return int != 0
-                                    }
-
-                                    if let string = $0.originalString {
-                                        switch string.lowercased() {
-                                        case "true":
-                                            return true
-                                        default:
-                                            break
-                                        }
-                                    }
-
-                                    return nil
+                    static let valueExtractor: AnandaValueExtractor = .standard.updatingBool {
+                        if let bool = $0.originalBool {
+                            return bool
+                        } else {
+                            if let int = $0.originalInt {
+                                return int != 0
+                            }
+
+                            if let string = $0.originalString {
+                                switch string.lowercased() {
+                                case "true":
+                                    return true
+                                default:
+                                    break
                                 }
                             }
-                        )
+
+                            return nil
+                        }
                     }
 
                     let id: Int