diff --git a/TrueTime.xcodeproj/project.pbxproj b/TrueTime.xcodeproj/project.pbxproj
index 41a4701..8c72d46 100644
--- a/TrueTime.xcodeproj/project.pbxproj
+++ b/TrueTime.xcodeproj/project.pbxproj
@@ -1060,8 +1060,8 @@
 				ENABLE_TESTABILITY = YES;
 				GCC_WARN_ABOUT_MISSING_NEWLINE = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
-				MACOSX_DEPLOYMENT_TARGET = 10.10;
+				IPHONEOS_DEPLOYMENT_TARGET = 13.0;
+				MACOSX_DEPLOYMENT_TARGET = 10.13;
 				MTL_ENABLE_DEBUG_INFO = YES;
 				OTHER_SWIFT_FLAGS = "-D DEBUG_LOGGING";
 				"OTHER_SWIFT_FLAGS[arch=*]" = "-D DEBUG_LOGGING";
@@ -1093,8 +1093,8 @@
 				DEAD_CODE_STRIPPING = YES;
 				GCC_WARN_ABOUT_MISSING_NEWLINE = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
-				MACOSX_DEPLOYMENT_TARGET = 10.10;
+				IPHONEOS_DEPLOYMENT_TARGET = 13.0;
+				MACOSX_DEPLOYMENT_TARGET = 10.13;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = "";
 				SWIFT_COMPILATION_MODE = wholemodule;