diff --git a/README.md b/README.md
index a4fe543..70001b6 100644
--- a/README.md
+++ b/README.md
@@ -51,7 +51,7 @@ Alternatively, you can:
 
 - Update to macOS 10.14.4 or later
 - Install Xcode 10.2 or later at `/Applications/Xcode.app`
-- Rebuild mas from source using Xcode 10.0 or later
+- Rebuild mas from source using Xcode 11.4 or later
 
 ### 🐙 GitHub Releases
 
diff --git a/mas-cli.xcodeproj/project.pbxproj b/mas-cli.xcodeproj/project.pbxproj
index 8b1c77b..8e11070 100644
--- a/mas-cli.xcodeproj/project.pbxproj
+++ b/mas-cli.xcodeproj/project.pbxproj
@@ -1189,7 +1189,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "com.mphys.mas-cli";
 				SDKROOT = macosx;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 5.2;
 				VERSIONING_SYSTEM = "apple-generic";
 			};
 			name = Debug;
@@ -1249,7 +1249,7 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.mphys.mas-cli";
 				SDKROOT = macosx;
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 5.2;
 				VERSIONING_SYSTEM = "apple-generic";
 			};
 			name = Release;
@@ -1274,7 +1274,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_FORCE_DYNAMIC_LINK_STDLIB = YES;
 				SWIFT_FORCE_STATIC_LINK_STDLIB = NO;
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 5.2;
 			};
 			name = Debug;
 		};
@@ -1300,7 +1300,7 @@
 				SWIFT_FORCE_DYNAMIC_LINK_STDLIB = YES;
 				SWIFT_FORCE_STATIC_LINK_STDLIB = NO;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 5.2;
 			};
 			name = Release;
 		};
@@ -1406,7 +1406,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = at.phatbl.MasKitTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 5.2;
 			};
 			name = Debug;
 		};
@@ -1435,7 +1435,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = at.phatbl.MasKitTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 5.2;
 			};
 			name = Release;
 		};