diff --git a/GCDWebServer.xcodeproj/project.pbxproj b/GCDWebServer.xcodeproj/project.pbxproj
index edf8f80..3ac82bb 100644
--- a/GCDWebServer.xcodeproj/project.pbxproj
+++ b/GCDWebServer.xcodeproj/project.pbxproj
@@ -370,7 +370,7 @@
 		08FB7793FE84155DC02AAC07 /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastUpgradeCheck = 0510;
+				LastUpgradeCheck = 0600;
 			};
 			buildConfigurationList = 1DEB928908733DD80010E9CD /* Build configuration list for PBXProject "GCDWebServer" */;
 			compatibilityVersion = "Xcode 3.2";