diff --git a/Package.swift b/Package.swift
index c4e80b3..155986c 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,9 +1,9 @@
-// swift-tools-version:5.2
+// swift-tools-version:5.3
 import PackageDescription
 let package = Package(
     name: "CommandLineToolkit",
     platforms: [
-        .macOS(.v10_15),
+        .macOS(.v11),
     ],
     products: [
         .library(name: "AtomicModels", targets: ["AtomicModels"]),
diff --git a/Sources/ProcessController/DefaultProcessController.swift b/Sources/ProcessController/DefaultProcessController.swift
index fca10c1..1e93d60 100644
--- a/Sources/ProcessController/DefaultProcessController.swift
+++ b/Sources/ProcessController/DefaultProcessController.swift
@@ -85,7 +85,9 @@ public final class DefaultProcessController: ProcessController, CustomStringConv
         let process = Process()
         process.launchPath = pathToExecutable.pathString
         process.arguments = Array(arguments.dropFirst())
-        process.environment = environment
+        if (!environment.isEmpty) {
+            process.environment = environment
+        }
         process.currentDirectoryPath = workingDirectory.pathString
         try process.setStartsNewProcessGroup(false)
         return process