diff --git a/Sources/ProjectSpec/ProjectSpec.swift b/Sources/ProjectSpec/ProjectSpec.swift
index 95959c7f..03f5518f 100644
--- a/Sources/ProjectSpec/ProjectSpec.swift
+++ b/Sources/ProjectSpec/ProjectSpec.swift
@@ -21,6 +21,7 @@ public struct ProjectSpec {
     public var configs: [Config]
     public var schemes: [Scheme]
     public var options: Options
+    public var attributes: [String: Any]
 
     public struct Options {
         public var carthageBuildPath: String?
@@ -30,7 +31,7 @@ public struct ProjectSpec {
         }
     }
 
-    public init(name: String, configs: [Config] = [], targets: [Target] = [], settings: Settings = .empty, settingGroups: [String: Settings] = [:], schemes: [Scheme] = [], options: Options = Options()) {
+    public init(name: String, configs: [Config] = [], targets: [Target] = [], settings: Settings = .empty, settingGroups: [String: Settings] = [:], schemes: [Scheme] = [], options: Options = Options(), attributes: [String: Any] = [:]) {
         self.name = name
         self.targets = targets
         self.configs = configs
@@ -38,6 +39,7 @@ public struct ProjectSpec {
         self.settingGroups = settingGroups
         self.schemes = schemes
         self.options = options
+        self.attributes = attributes
     }
 
     public func getTarget(_ targetName: String) -> Target? {
@@ -79,6 +81,7 @@ extension ProjectSpec: JSONObjectConvertible {
         self.configs = configs.map { Config(name: $0, type: ConfigType(rawValue: $1)) }
         targets = try Target.decodeTargets(jsonDictionary: jsonDictionary)
         schemes = try jsonDictionary.json(atKeyPath: "schemes")
+        attributes = jsonDictionary.json(atKeyPath: "attributes") ?? [:]
         if jsonDictionary["options"] != nil {
             options = try jsonDictionary.json(atKeyPath: "options")
         } else {
diff --git a/Sources/XcodeGenKit/PBXProjGenerator.swift b/Sources/XcodeGenKit/PBXProjGenerator.swift
index 9b093815..bf101b57 100644
--- a/Sources/XcodeGenKit/PBXProjGenerator.swift
+++ b/Sources/XcodeGenKit/PBXProjGenerator.swift
@@ -18,6 +18,7 @@ public class PBXProjGenerator {
 
     let spec: ProjectSpec
     let basePath: Path
+    let currentXcodeVersion = "0830"
 
     var fileReferencesByPath: [Path: String] = [:]
     var groupsByPath: [Path: PBXGroup] = [:]
@@ -133,7 +134,15 @@ public class PBXProjGenerator {
         addObject(mainGroup)
 
         let knownRegions: [String] = ["en", "Base"]
-        let root = PBXProject(reference: project.rootObject, buildConfigurationList: buildConfigList.reference, compatibilityVersion: "Xcode 3.2", mainGroup: mainGroup.reference, developmentRegion: "English", knownRegions: knownRegions, targets: targets.referenceList)
+        let projectAttributes: [String: Any] = spec.attributes.isEmpty ? ["LastUpgradeCheck": currentXcodeVersion] : spec.attributes
+        let root = PBXProject(reference: project.rootObject,
+                              buildConfigurationList: buildConfigList.reference,
+                              compatibilityVersion: "Xcode 3.2",
+                              mainGroup: mainGroup.reference,
+                              developmentRegion: "English",
+                              knownRegions: knownRegions,
+                              targets: targets.referenceList,
+                              attributes: projectAttributes)
         project.projects.append(root)
 
         return project
diff --git a/docs/ProjectSpec.md b/docs/ProjectSpec.md
index 16f15626..50c37da4 100644
--- a/docs/ProjectSpec.md
+++ b/docs/ProjectSpec.md
@@ -27,6 +27,7 @@ Required properties are marked 🔵 and optional properties with ⚪️.
 - 🔵 **name**: `String` - Name of the generated project
 - ⚪️ **include**: `[String]` - The paths to other specs. They will be merged in order and then the current spec will be merged on top
 - ⚪️ **options**: [Options](#options) - Various options to override default behaviour
+- ⚪️ **attributes**: `map` - The PBXProject attributes. This is for advanced use. Defaults to ``{"LastUpgradeCheck": "0830"}``
 - ⚪️ **configs**: [Configs](#configs) - Project build configurations. Defaults to `Debug` and `Release` configs
 - ⚪️ **settings**: [Settings](#settings) - Project specific settings. Default base and config type settings will be applied first before any settings defined here
 - ⚪️ **settingGroups**: [Setting Groups](#setting-groups) - Setting groups mapped by name