diff --git a/pdfbooklet.xcodeproj/project.pbxproj b/pdfbooklet.xcodeproj/project.pbxproj
index ecd424f..d75f1ff 100644
--- a/pdfbooklet.xcodeproj/project.pbxproj
+++ b/pdfbooklet.xcodeproj/project.pbxproj
@@ -109,6 +109,7 @@
 			developmentRegion = English;
 			hasScannedForEncodings = 0;
 			knownRegions = (
+				English,
 				en,
 			);
 			mainGroup = 7B431D401DF651AD00228135;
@@ -227,7 +228,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				DEVELOPMENT_TEAM = 68CMXNWZP4;
-				MACOSX_DEPLOYMENT_TARGET = 10.9;
+				MACOSX_DEPLOYMENT_TARGET = 10.13;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};
 			name = Debug;
@@ -236,7 +237,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				DEVELOPMENT_TEAM = 68CMXNWZP4;
-				MACOSX_DEPLOYMENT_TARGET = 10.9;
+				MACOSX_DEPLOYMENT_TARGET = 10.13;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};
 			name = Release;