diff --git a/products/llbuildSwift/BuildSystemBindings.swift b/products/llbuildSwift/BuildSystemBindings.swift
index 2ee1854b..85c8fe24 100644
--- a/products/llbuildSwift/BuildSystemBindings.swift
+++ b/products/llbuildSwift/BuildSystemBindings.swift
@@ -519,7 +519,7 @@ private final class CommandWrapper {
 }
 
 /// Encapsulates a diagnostic as reported by the build system.
-public struct Diagnostic {
+public struct Diagnostic: Sendable {
     public typealias Kind = DiagnosticKind
 
     /// The kind of diagnostic.
@@ -726,7 +726,7 @@ public struct ProcessHandle: Hashable {
     }
 }
 
-public struct CommandMetrics {
+public struct CommandMetrics: Hashable, Sendable {
     public let utime: UInt64         /// User time (in us)
     public let stime: UInt64         /// Sys time (in us)
     public let maxRSS: UInt64        /// Max RSS (in bytes)
@@ -739,7 +739,7 @@ public struct CommandMetrics {
 }
 
 /// Result of a command execution.
-public struct CommandExtendedResult {
+public struct CommandExtendedResult: Sendable {
     public let result: CommandResult    /// The result of a command execution
     public let exitStatus: Int32        /// The exit code
     public let pid: llbuild_pid_t?      /// The process identifier (nil if failed to create a process)
diff --git a/products/llbuildSwift/CoreBindings.swift b/products/llbuildSwift/CoreBindings.swift
index cb59cd17..99f49d58 100644
--- a/products/llbuildSwift/CoreBindings.swift
+++ b/products/llbuildSwift/CoreBindings.swift
@@ -31,7 +31,7 @@ private func stringFromUInt8Array(_ data: [UInt8]) -> String {
 }
 
 /// Key objects are used to identify rules that can be built.
-public struct Key: CustomStringConvertible, Equatable, Hashable {
+public struct Key: CustomStringConvertible, Equatable, Hashable, Sendable {
     public let data: [UInt8]
 
     // MARK: CustomStringConvertible Conformance
@@ -66,7 +66,7 @@ public struct Key: CustomStringConvertible, Equatable, Hashable {
 }
 
 /// Value objects are the result of building rules.
-public struct Value: CustomStringConvertible, Equatable, Hashable {
+public struct Value: CustomStringConvertible, Equatable, Hashable, Sendable {
     public let data: [UInt8]
 
     public var description: String {
diff --git a/products/llbuildSwift/NinjaManifest.swift b/products/llbuildSwift/NinjaManifest.swift
index f7bad3ca..01df324d 100644
--- a/products/llbuildSwift/NinjaManifest.swift
+++ b/products/llbuildSwift/NinjaManifest.swift
@@ -18,7 +18,7 @@ public enum NinjaError: Error {
   case invalidManifest(errors: String)
 }
 
-public struct NinjaRule: Codable, Equatable {
+public struct NinjaRule: Codable, Equatable, Sendable {
   public let name: String
   public let variables: [String: String]
 
@@ -28,7 +28,7 @@ public struct NinjaRule: Codable, Equatable {
   }
 }
 
-public struct NinjaBuildStatement: Codable, Equatable {
+public struct NinjaBuildStatement: Codable, Equatable, Sendable {
   public let rule: NinjaRule
   public let command: String
   public let description: String
@@ -61,7 +61,7 @@ public struct NinjaBuildStatement: Codable, Equatable {
   }
 }
 
-public struct NinjaManifest: Codable, Equatable {
+public struct NinjaManifest: Codable, Equatable, Sendable {
   public let rules: [String: NinjaRule]
   public let statements: [NinjaBuildStatement]
   public let defaultTargets: [String]