diff --git a/SimpleKeychain/SimpleKeychainError.swift b/SimpleKeychain/SimpleKeychainError.swift
index fce2d05..438ed24 100644
--- a/SimpleKeychain/SimpleKeychainError.swift
+++ b/SimpleKeychain/SimpleKeychainError.swift
@@ -12,6 +12,7 @@ public struct SimpleKeychainError: LocalizedError, CustomDebugStringConvertible
         case itemNotFound
         case interactionNotAllowed
         case decodeFailed
+        case missingEntitlement
         case other(status: OSStatus)
         case unknown(message: String)
 
@@ -26,6 +27,7 @@ public struct SimpleKeychainError: LocalizedError, CustomDebugStringConvertible
             case errSecItemNotFound: self = .itemNotFound
             case errSecInteractionNotAllowed: self = .interactionNotAllowed
             case errSecDecode: self = .decodeFailed
+            case errSecMissingEntitlement: self = .missingEntitlement
             default: self = .other(status: rawValue)
             }
         }
@@ -41,6 +43,7 @@ public struct SimpleKeychainError: LocalizedError, CustomDebugStringConvertible
             case .itemNotFound: return errSecItemNotFound
             case .interactionNotAllowed: return errSecInteractionNotAllowed
             case .decodeFailed: return errSecDecode
+            case .missingEntitlement: return errSecMissingEntitlement
             case let .other(status): return status
             case .unknown: return errSecSuccess // This is not a Keychain error
             }
@@ -91,6 +94,8 @@ public struct SimpleKeychainError: LocalizedError, CustomDebugStringConvertible
             return "errSecInteractionNotAllowed: Interaction with the Security Server is not allowed."
         case .decodeFailed:
             return "errSecDecode: Unable to decode the provided data."
+        case .missingEntitlement:
+            return "errSecMissingEntitlement: A required entitlement is missing."
         case .other:
             return "Unspecified Keychain error: \(self.status)."
         case let .unknown(message):
@@ -136,6 +141,10 @@ public struct SimpleKeychainError: LocalizedError, CustomDebugStringConvertible
     /// See [errSecDecode](https://developer.apple.com/documentation/security/errsecdecode).
     public static let decodeFailed: SimpleKeychainError = .init(code: .decodeFailed)
 
+    /// A required entitlement is missing.
+    /// See [errSecMissingEntitlement](https://developer.apple.com/documentation/security/errsecmissingentitlement).
+    public static let missingEntitlement: SimpleKeychainError = .init(code: .missingEntitlement)
+
     /// Other Keychain error.
     /// The `OSStatus` of the Keychain operation can be accessed via the ``status`` property.
     public static let other: SimpleKeychainError = .init(code: .other(status: 0))
diff --git a/SimpleKeychainTests/SimpleKeychainErrorSpec.swift b/SimpleKeychainTests/SimpleKeychainErrorSpec.swift
index c9ecf67..2b37a2c 100644
--- a/SimpleKeychainTests/SimpleKeychainErrorSpec.swift
+++ b/SimpleKeychainTests/SimpleKeychainErrorSpec.swift
@@ -108,7 +108,13 @@ class SimpleKeychainErrorSpec: XCTestCase {
         let sut = SimpleKeychainError(code: .decodeFailed)
         XCTAssertEqual(sut.localizedDescription, message)
     }
-    
+
+  func testErrorMessage_shouldReturnMessageForMissingEntitlement() {
+      let message = "errSecMissingEntitlement: A required entitlement is missing."
+      let sut = SimpleKeychainError(code: .missingEntitlement)
+      XCTAssertEqual(sut.localizedDescription, message)
+  }
+
     func testErrorMessage_shouldReturnMessageForOtherError() {
         let status: OSStatus = 123
         let message = "Unspecified Keychain error: \(status)."
@@ -167,7 +173,12 @@ class SimpleKeychainErrorSpec: XCTestCase {
         let sut = SimpleKeychainError.Code(rawValue: errSecDecode)
         XCTAssertEqual(sut, SimpleKeychainError.decodeFailed.code)
     }
-    
+
+    func testMapErrSecMissingEntitlement() {
+        let sut = SimpleKeychainError.Code(rawValue: errSecMissingEntitlement)
+        XCTAssertEqual(sut, SimpleKeychainError.missingEntitlement.code)
+    }
+
     func testMapOtherStatusValue() {
         let status: OSStatus = 1234
         let sut = SimpleKeychainError.Code(rawValue: status)
@@ -205,7 +216,11 @@ class SimpleKeychainErrorSpec: XCTestCase {
     func testMapDecodeFailed() {
         XCTAssertEqual(SimpleKeychainError.decodeFailed.code.rawValue, errSecDecode)
     }
-    
+
+    func testMapMissingEntitlement() {
+        XCTAssertEqual(SimpleKeychainError.missingEntitlement.code.rawValue, errSecMissingEntitlement)
+    }
+
     func testMapOther() {
         let status: OSStatus = 1234
         XCTAssertEqual(SimpleKeychainError(code: .other(status: status)).status, status)