diff --git a/CHANGELOG.md b/CHANGELOG.md
index 57b8247..6e8cf84 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
-## [1.4.0] - 2026-03-18
+## [1.2.1] - 2026-06-17
+### Added
+- Added retroactive conformance to `@unchecked Sendable` for `SecCertificate`, `SecIdentity`, `SecKey`, and `SecKeychainItem`. This is safe because Apple eventually adds this same conformance beginning in Xcode 26.
+
+## [1.2.0] - 2026-03-18
 ### Added
 - Added convenience methods for accessing mock data values on the `HaversackEphemeralStrategy`
 - Added `Sendable` conformance to all public types, protocols, and enums.
@@ -21,7 +25,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Internal `CFString` dictionary keys migrated to `String` for `Sendable` compatibility.
 - Completion handlers and closure properties marked `@Sendable`.
 
-## [1.3.0] - 2024-02-11
+## [1.2.0-prerelease] - 2024-02-11
 ### Added
 - Added support for visionOS.
 
diff --git a/Sources/Haversack/Entities/PasswordBaseEntity.swift b/Sources/Haversack/Entities/PasswordBaseEntity.swift
index 64464f0..577af56 100644
--- a/Sources/Haversack/Entities/PasswordBaseEntity.swift
+++ b/Sources/Haversack/Entities/PasswordBaseEntity.swift
@@ -65,8 +65,6 @@ public protocol PasswordBaseEntity: KeychainStorable {
     /// - Note: Uses `kSecValueData`.
     var passwordData: Data? { get set }
 
-    // NOTE: This function has a cyclomatic complexity of 11 instead of the allowed 10.
-    // swiftlint:disable:next cyclomatic_complexity
     func entityQuery(includeSecureData: Bool) -> SecurityFrameworkQuery
 }
 
@@ -76,7 +74,8 @@ extension PasswordBaseEntity {
         return passwordData == nil
     }
 
-    // swiftlint:disable:next identifier_name
+    // NOTE: This function has a cyclomatic complexity of 11 instead of the allowed 10.
+    // swiftlint:disable:next identifier_name cyclomatic_complexity
     func _entityQuery(includeSecureData: Bool) -> SecurityFrameworkQuery {
         var newQuery = SecurityFrameworkQuery()
 
diff --git a/Sources/Haversack/NSLocked.swift b/Sources/Haversack/NSLocked.swift
index 235dbb6..f23acb2 100644
--- a/Sources/Haversack/NSLocked.swift
+++ b/Sources/Haversack/NSLocked.swift
@@ -7,11 +7,11 @@ import Foundation
 public struct NSLocked<T>: @unchecked Sendable {
     private let lock = NSLock()
     private var value: T
-    
+
     public init(wrappedValue: T) {
         value = wrappedValue
     }
-    
+
     public var wrappedValue: T {
         get {
             lock.withLock {
diff --git a/Sources/Haversack/SecuritySendable.swift b/Sources/Haversack/SecuritySendable.swift
new file mode 100644
index 0000000..05a47cb
--- /dev/null
+++ b/Sources/Haversack/SecuritySendable.swift
@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: MIT
+// Copyright 2026, Jamf
+
+import Security
+
+#if compiler(<6) // conformance for Xcode less than 16.0, @retroactive unavailable until Swift 6
+extension SecCertificate: @unchecked Sendable {}
+extension SecIdentity: @unchecked Sendable {}
+extension SecKey: @unchecked Sendable {}
+#if os(macOS)
+extension SecKeychainItem: @unchecked Sendable {}
+#endif
+#elseif compiler(<6.2) // retroactive conformance for Xcode 16.0
+extension SecCertificate: @retroactive @unchecked Sendable {}
+extension SecIdentity: @retroactive @unchecked Sendable {}
+extension SecKey: @retroactive @unchecked Sendable {}
+#if os(macOS)
+extension SecKeychainItem: @retroactive @unchecked Sendable {}
+#endif
+#endif