diff --git a/RationalNumeric.xcodeproj/project.pbxproj b/RationalNumeric.xcodeproj/project.pbxproj
index 0f6de49..6f8eaaf 100644
--- a/RationalNumeric.xcodeproj/project.pbxproj
+++ b/RationalNumeric.xcodeproj/project.pbxproj
@@ -150,7 +150,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 1000;
-				LastUpgradeCheck = 1000;
+				LastUpgradeCheck = 1010;
 				ORGANIZATIONNAME = "Nathaniel Day";
 				TargetAttributes = {
 					D85B4B8220FCAD8100A7224A = {
@@ -251,6 +251,7 @@
 				COPY_PHASE_STRIP = NO;
 				DEBUG_INFORMATION_FORMAT = dwarf;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_TESTABILITY = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_DYNAMIC_NO_PIC = NO;
 				GCC_NO_COMMON_BLOCKS = YES;