diff --git a/Package.swift b/Package.swift
index 2c689cf..c96e65f 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version:5.9
+// swift-tools-version: 6.0
 import PackageDescription
 
 let package = Package(
diff --git a/Sources/HandySwift/Globals.swift b/Sources/HandySwift/Globals.swift
index 6d90289..2746324 100644
--- a/Sources/HandySwift/Globals.swift
+++ b/Sources/HandySwift/Globals.swift
@@ -6,7 +6,7 @@ import Foundation
 ///   - timeInterval: The duration of the delay. E.g., `.seconds(1)` or `.milliseconds(200)`.
 ///   - qosClass: The global QoS class to be used or `nil` to use the main thread. Defaults to `nil`.
 ///   - closure: The code to run with a delay.
-public func delay(by timeInterval: TimeInterval, qosClass: DispatchQoS.QoSClass? = nil, _ closure: @escaping () -> Void) {
+public func delay(by timeInterval: TimeInterval, qosClass: DispatchQoS.QoSClass? = nil, _ closure: @Sendable @escaping () -> Void) {
    let dispatchQueue = qosClass != nil ? DispatchQueue.global(qos: qosClass!) : DispatchQueue.main
    dispatchQueue.asyncAfter(deadline: DispatchTime.now() + timeInterval, execute: closure)
 }
@@ -19,7 +19,7 @@ public func delay(by timeInterval: TimeInterval, qosClass: DispatchQoS.QoSClass?
 ///   - closure: The code to run with a delay.
 @_disfavoredOverload
 @available(iOS 16, macOS 13, tvOS 16, visionOS 1, watchOS 9, *)
-public func delay(by duration: Duration, qosClass: DispatchQoS.QoSClass? = nil, _ closure: @escaping () -> Void) {
+public func delay(by duration: Duration, qosClass: DispatchQoS.QoSClass? = nil, _ closure: @Sendable @escaping () -> Void) {
    let dispatchQueue = qosClass != nil ? DispatchQueue.global(qos: qosClass!) : DispatchQueue.main
    dispatchQueue.asyncAfter(deadline: DispatchTime.now() + duration.timeInterval, execute: closure)
 }
diff --git a/Sources/HandySwift/Types/Debouncer.swift b/Sources/HandySwift/Types/Debouncer.swift
index c9184d9..db0383a 100644
--- a/Sources/HandySwift/Types/Debouncer.swift
+++ b/Sources/HandySwift/Types/Debouncer.swift
@@ -52,7 +52,7 @@ public final class Debouncer {
    /// }
    /// ```
    @available(iOS 16, macOS 13, tvOS 16, visionOS 1, watchOS 9, *)
-   public func delay(for duration: Duration, id: String = "default", operation: @escaping () -> Void) {
+   public func delay(for duration: Duration, id: String = "default", operation: @Sendable @escaping () -> Void) {
       self.cancel(id: id)
       self.timerByID[id] = Timer.scheduledTimer(withTimeInterval: duration.timeInterval, repeats: false) { _ in
          operation()
@@ -76,7 +76,7 @@ public final class Debouncer {
    ///     performOperation()
    /// }
    /// ```
-   public func delay(for interval: TimeInterval, id: String = "default", operation: @escaping () -> Void) {
+   public func delay(for interval: TimeInterval, id: String = "default", operation: @Sendable @escaping () -> Void) {
       self.cancel(id: id)
       self.timerByID[id] = Timer.scheduledTimer(withTimeInterval: interval, repeats: false) { _ in
          operation()
diff --git a/Sources/HandySwift/Types/HandyRegex.swift b/Sources/HandySwift/Types/HandyRegex.swift
index ca31a7a..28ae3ab 100644
--- a/Sources/HandySwift/Types/HandyRegex.swift
+++ b/Sources/HandySwift/Types/HandyRegex.swift
@@ -206,7 +206,7 @@ extension HandyRegex: Hashable {
 
 extension HandyRegex {
    /// `Options` defines alternate behaviours of regular expressions when matching.
-   public struct Options: OptionSet {
+   public struct Options: OptionSet, Sendable {
       /// Ignores the case of letters when matching.
       public static let ignoreCase = Options(rawValue: 1)