diff --git a/Sources/tart/Config.swift b/Sources/tart/Config.swift
index 6739fec..c7d0899 100644
--- a/Sources/tart/Config.swift
+++ b/Sources/tart/Config.swift
@@ -1,11 +1,23 @@
 import Foundation
 
 struct Config {
-  public static let tartHomeDir: URL = FileManager.default
-          .homeDirectoryForCurrentUser
-          .appendingPathComponent(".tart", isDirectory: true)
+  let tartHomeDir: URL
+  let tartCacheDir: URL
 
-  public static let tartCacheDir: URL = tartHomeDir.appendingPathComponent("cache", isDirectory: true)
+  init() {
+    var tartHomeDir: URL
+
+    if let customTartHome = ProcessInfo.processInfo.environment["TART_HOME"] {
+      tartHomeDir = URL(fileURLWithPath: customTartHome)
+    } else {
+      tartHomeDir = FileManager.default
+              .homeDirectoryForCurrentUser
+              .appendingPathComponent(".tart", isDirectory: true)
+    }
+
+    self.tartHomeDir = tartHomeDir
+    tartCacheDir = tartHomeDir.appendingPathComponent("cache", isDirectory: true)
+  }
 
   static func jsonEncoder() -> JSONEncoder {
     let encoder = JSONEncoder()
diff --git a/Sources/tart/VM.swift b/Sources/tart/VM.swift
index 3072384..76c3bc0 100644
--- a/Sources/tart/VM.swift
+++ b/Sources/tart/VM.swift
@@ -53,7 +53,7 @@ class VM: NSObject, VZVirtualMachineDelegate, ObservableObject {
     }
 
 
-    let ipswCacheFolder = Config.tartCacheDir.appendingPathComponent("IPSWs", isDirectory: true)
+    let ipswCacheFolder = Config().tartCacheDir.appendingPathComponent("IPSWs", isDirectory: true)
     try FileManager.default.createDirectory(at: ipswCacheFolder, withIntermediateDirectories: true)
 
     let expectedIPSWLocation = ipswCacheFolder.appendingPathComponent("\(image.buildVersion).ipsw", isDirectory: false)
diff --git a/Sources/tart/VMStorageLocal.swift b/Sources/tart/VMStorageLocal.swift
index a5ed92b..7126492 100644
--- a/Sources/tart/VMStorageLocal.swift
+++ b/Sources/tart/VMStorageLocal.swift
@@ -1,7 +1,7 @@
 import Foundation
 
 class VMStorageLocal {
-  let baseURL: URL = Config.tartHomeDir.appendingPathComponent("vms", isDirectory: true)
+  let baseURL: URL = Config().tartHomeDir.appendingPathComponent("vms", isDirectory: true)
 
   private func vmURL(_ name: String) -> URL {
     baseURL.appendingPathComponent(name, isDirectory: true)
diff --git a/Sources/tart/VMStorageOCI.swift b/Sources/tart/VMStorageOCI.swift
index 208e3f6..48fc79d 100644
--- a/Sources/tart/VMStorageOCI.swift
+++ b/Sources/tart/VMStorageOCI.swift
@@ -1,7 +1,7 @@
 import Foundation
 
 class VMStorageOCI {
-  let baseURL = Config.tartCacheDir.appendingPathComponent("OCIs", isDirectory: true)
+  let baseURL = Config().tartCacheDir.appendingPathComponent("OCIs", isDirectory: true)
 
   private func vmURL(_ name: RemoteName) -> URL {
     baseURL.appendingRemoteName(name)