diff --git a/CHANGELOG.md b/CHANGELOG.md
index 14b22af..2d474d8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,14 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## 3.0.2 - 2024-02-07
+
+### Added
+- Additional `Sendable` conformance where it can't be implicitly determined outside of this package.
+
+### Removed
+- `open` scope from `Subprocess` since none of its members were `open`.
+
 ## 3.0.1 - 2023-11-27
 
 ### Added
diff --git a/Package.swift b/Package.swift
index f72edb6..3f6fc73 100644
--- a/Package.swift
+++ b/Package.swift
@@ -2,6 +2,19 @@
 
 import PackageDescription
 
+#if swift(<6)
+let swiftSettings: [SwiftSetting] = [
+    .enableUpcomingFeature("StrictConcurrency"),
+    .enableUpcomingFeature("ExistentialAny"),
+    .enableUpcomingFeature("ForwardTrailingClosures"),
+    .enableUpcomingFeature("ImplicitOpenExistentials"),
+    .enableUpcomingFeature("BareSlashRegexLiterals"),
+    .enableUpcomingFeature("ConciseMagicFile"),
+]
+#else
+let swiftSettings: [SwiftSetting] = []
+#endif
+
 let package = Package(
     name: "Subprocess",
     platforms: [ .macOS("10.15.4") ],
@@ -33,26 +46,30 @@ let package = Package(
     targets: [
         .target(
             name: "Subprocess",
-            dependencies: []
+            dependencies: [],
+            swiftSettings: swiftSettings
         ),
         .target(
             name: "SubprocessMocks",
             dependencies: [
                 .target(name: "Subprocess")
-            ]
+            ],
+            swiftSettings: swiftSettings
         ),
         .testTarget(
             name: "UnitTests",
             dependencies: [
                 .target(name: "Subprocess"),
                 .target(name: "SubprocessMocks")
-            ]
+            ],
+            swiftSettings: swiftSettings
         ),
         .testTarget(
             name: "SystemTests",
             dependencies: [
                 .target(name: "Subprocess")
-            ]
+            ],
+            swiftSettings: swiftSettings
         )
     ]
 )
diff --git a/Sources/Subprocess/Subprocess.swift b/Sources/Subprocess/Subprocess.swift
index 5ce893f..5ad7489 100644
--- a/Sources/Subprocess/Subprocess.swift
+++ b/Sources/Subprocess/Subprocess.swift
@@ -29,7 +29,7 @@ import Foundation
 import Combine
 
 /// Class used for asynchronous process execution
-open class Subprocess: @unchecked Sendable {
+public class Subprocess: @unchecked Sendable {
     /// Output options.
     public struct OutputOptions: OptionSet {
         public let rawValue: Int
@@ -240,7 +240,7 @@ open class Subprocess: @unchecked Sendable {
 // Methods for typical one-off acquisition of output from running some command.
 extension Subprocess {
     /// Additional configuration options.
-    public struct RunOptions: OptionSet {
+    public struct RunOptions: OptionSet, Sendable {
         public let rawValue: Int
 
         /// Throw an error if the process exited with a non-zero exit code.
@@ -259,7 +259,7 @@ extension Subprocess {
     ///   - command: An external command to run with optional arguments.
     ///   - standardInput: A type conforming to `DataProtocol` (typically a `Data` type) from which to read input to the external command.
     ///   - options: Options used to specify runtime behavior.
-    public static func data(for command: [String], standardInput: (any DataProtocol)? = nil, options: RunOptions = .throwErrorOnNonZeroExit) async throws -> Data {
+    public static func data(for command: [String], standardInput: (any DataProtocol & Sendable)? = nil, options: RunOptions = .throwErrorOnNonZeroExit) async throws -> Data {
         let subprocess = Self(command)
         let (standardOutput, standardError, waitForExit) = if let standardInput {
             try subprocess.run(standardInput: AsyncStream(UInt8.self, { continuation in
@@ -422,7 +422,7 @@ extension Subprocess {
     ///   - standardInput: A type conforming to `DataProtocol` (typically a `Data` type) from which to read input to the external command.
     ///   - options: Options used to specify runtime behavior.
     @inlinable
-    public static func string(for command: [String], standardInput: (any DataProtocol)? = nil, options: RunOptions = .throwErrorOnNonZeroExit) async throws -> String {
+    public static func string(for command: [String], standardInput: (any DataProtocol & Sendable)? = nil, options: RunOptions = .throwErrorOnNonZeroExit) async throws -> String {
         String(decoding: try await data(for: command, standardInput: standardInput, options: options), as: UTF8.self)
     }
     
@@ -455,7 +455,7 @@ extension Subprocess {
     ///   - options: Options used to specify runtime behavior.
     ///   - decoder: A `TopLevelDecoder` that will be used to decode the data.
     @inlinable
-    public static func value<Content, Decoder>(for command: [String], standardInput: (any DataProtocol)? = nil, options: RunOptions = .throwErrorOnNonZeroExit, decoder: Decoder) async throws -> Content where Content : Decodable, Decoder : TopLevelDecoder, Decoder.Input == Data {
+    public static func value<Content, Decoder>(for command: [String], standardInput: (any DataProtocol & Sendable)? = nil, options: RunOptions = .throwErrorOnNonZeroExit, decoder: Decoder) async throws -> Content where Content : Decodable, Decoder : TopLevelDecoder, Decoder.Input == Data {
         try await decoder.decode(Content.self, from: data(for: command, standardInput: standardInput, options: options))
     }