diff --git a/FlagsmithClient/Classes/Feature.swift b/FlagsmithClient/Classes/Feature.swift
index 1c0ce75..446bb4f 100644
--- a/FlagsmithClient/Classes/Feature.swift
+++ b/FlagsmithClient/Classes/Feature.swift
@@ -10,7 +10,7 @@ import Foundation
 /**
  A Feature represents a flag or remote configuration value on the server.
  */
-public struct Feature: Codable {
+public struct Feature: Codable, Sendable {
   enum CodingKeys: String, CodingKey {
     case name
     case type
diff --git a/FlagsmithClient/Classes/Flag.swift b/FlagsmithClient/Classes/Flag.swift
index 1929beb..b9a9ebc 100644
--- a/FlagsmithClient/Classes/Flag.swift
+++ b/FlagsmithClient/Classes/Flag.swift
@@ -10,7 +10,7 @@ import Foundation
 /**
 A Flag represents a feature flag on the server.
 */
-public struct Flag: Codable {
+public struct Flag: Codable, Sendable {
   enum CodingKeys: String, CodingKey {
     case feature
     case value = "feature_state_value"
diff --git a/FlagsmithClient/Classes/Flagsmith+Concurrency.swift b/FlagsmithClient/Classes/Flagsmith+Concurrency.swift
index 0bd2dbf..0e0c2f1 100644
--- a/FlagsmithClient/Classes/Flagsmith+Concurrency.swift
+++ b/FlagsmithClient/Classes/Flagsmith+Concurrency.swift
@@ -7,7 +7,6 @@
 
 import Foundation
 
-#if swift(>=5.5)
 @available(macOS 10.15, iOS 13.0, tvOS 13.0, watchOS 7.0, *)
 public extension Flagsmith {
   /// Get all feature flags (flags and remote config) optionally for a specific identity
@@ -180,4 +179,3 @@ public extension Flagsmith {
     })
   }
 }
-#endif
diff --git a/FlagsmithClient/Classes/FlagsmithError.swift b/FlagsmithClient/Classes/FlagsmithError.swift
index 8f5fc43..fda9675 100644
--- a/FlagsmithClient/Classes/FlagsmithError.swift
+++ b/FlagsmithClient/Classes/FlagsmithError.swift
@@ -8,7 +8,7 @@
 import Foundation
 
 /// All errors that can be encountered while using the **FlagsmithClient**
-public enum FlagsmithError: LocalizedError {
+public enum FlagsmithError: LocalizedError, Sendable {
     /// API Key was not provided or invalid.
     case apiKey
     /// API URL was invalid.
diff --git a/FlagsmithClient/Classes/Identity.swift b/FlagsmithClient/Classes/Identity.swift
index 00441cc..1dfbce3 100644
--- a/FlagsmithClient/Classes/Identity.swift
+++ b/FlagsmithClient/Classes/Identity.swift
@@ -10,7 +10,7 @@ import Foundation
 /**
 An Identity represents a user stored on the server.
 */
-public struct Identity: Decodable {
+public struct Identity: Decodable, Sendable {
   enum CodingKeys: String, CodingKey {
     case flags
     case traits
diff --git a/FlagsmithClient/Classes/Trait.swift b/FlagsmithClient/Classes/Trait.swift
index 8468f2b..85e9ec6 100644
--- a/FlagsmithClient/Classes/Trait.swift
+++ b/FlagsmithClient/Classes/Trait.swift
@@ -10,7 +10,7 @@ import Foundation
 /**
 A Trait represents a value stored against an Identity (user) on the server.
 */
-public struct Trait: Codable {
+public struct Trait: Codable, Sendable {
   enum CodingKeys: String, CodingKey {
     case key = "trait_key"
     case value = "trait_value"
diff --git a/FlagsmithClient/Classes/Traits.swift b/FlagsmithClient/Classes/Traits.swift
index 11a1a95..a6e41cb 100644
--- a/FlagsmithClient/Classes/Traits.swift
+++ b/FlagsmithClient/Classes/Traits.swift
@@ -10,7 +10,7 @@ import Foundation
 /**
 A Traits object represent a collection of different `Trait`s stored against the same Identity (user) on the server.
 */
-public struct Traits: Codable {
+public struct Traits: Codable, Sendable {
     public let traits: [Trait]
     public let identifier: String?
 }
diff --git a/FlagsmithClient/Classes/TypedValue.swift b/FlagsmithClient/Classes/TypedValue.swift
index dd95f80..5bd5794 100644
--- a/FlagsmithClient/Classes/TypedValue.swift
+++ b/FlagsmithClient/Classes/TypedValue.swift
@@ -8,7 +8,7 @@
 import Foundation
 
 /// A value associated to a `Flag` or `Trait`
-public enum TypedValue: Equatable {
+public enum TypedValue: Equatable, Sendable {
   case bool(Bool)
   case float(Float)
   case int(Int)
diff --git a/FlagsmithClient/Classes/UnknownTypeValue.swift b/FlagsmithClient/Classes/UnknownTypeValue.swift
index 0ed1d7e..7ff2ed0 100644
--- a/FlagsmithClient/Classes/UnknownTypeValue.swift
+++ b/FlagsmithClient/Classes/UnknownTypeValue.swift
@@ -11,7 +11,7 @@ import Foundation
 An UnknownTypeValue represents a value which can have a variable type
 */
 @available(*, deprecated, renamed: "TypedValue")
-public enum UnknownTypeValue: Decodable {
+public enum UnknownTypeValue: Decodable, Sendable {
     
     case int(Int), string(String), float(Float), null
     
diff --git a/Package.swift b/Package.swift
index e37a349..84a8f31 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version:5.3
+// swift-tools-version:5.5
 
 import PackageDescription