diff --git a/Locksmith.xcodeproj/project.pbxproj b/Locksmith.xcodeproj/project.pbxproj
index c068d41..fd66949 100644
--- a/Locksmith.xcodeproj/project.pbxproj
+++ b/Locksmith.xcodeproj/project.pbxproj
@@ -663,7 +663,6 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "net.matthewpalmer.Locksmith-iOS";
 				PRODUCT_NAME = Locksmith;
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -686,7 +685,6 @@
 				PRODUCT_NAME = Locksmith;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};
@@ -702,7 +700,6 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "net.matthewpalmer.Locksmith-iOSTests";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.0;
 				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/Test Host.app/Test Host";
 			};
 			name = Debug;
@@ -720,7 +717,6 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "net.matthewpalmer.Locksmith-iOSTests";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 4.0;
 				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/Test Host.app/Test Host";
 			};
 			name = Release;
@@ -745,7 +741,6 @@
 				PRODUCT_NAME = Locksmith;
 				SDKROOT = macosx;
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 3.0;
 			};
 			name = Debug;
 		};
@@ -770,7 +765,6 @@
 				SDKROOT = macosx;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 3.0;
 			};
 			name = Release;
 		};
@@ -788,7 +782,6 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "net.matthewpalmer.Locksmith-OS-XTests";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = macosx;
-				SWIFT_VERSION = 3.0;
 			};
 			name = Debug;
 		};
@@ -807,7 +800,6 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = macosx;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 3.0;
 			};
 			name = Release;
 		};
@@ -828,7 +820,6 @@
 				PRODUCT_NAME = Locksmith;
 				SDKROOT = watchos;
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = 4;
 				WATCHOS_DEPLOYMENT_TARGET = 2.0;
 			};
@@ -853,7 +844,6 @@
 				SDKROOT = watchos;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = 4;
 				WATCHOS_DEPLOYMENT_TARGET = 2.0;
 			};
@@ -993,7 +983,6 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "net.matthewpalmer.Test-Host";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
-				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -1016,7 +1005,6 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "net.matthewpalmer.Test-Host";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
@@ -1039,7 +1027,6 @@
 				PRODUCT_NAME = Locksmith;
 				SDKROOT = appletvos;
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 3.0;
 				TARGETED_DEVICE_FAMILY = 3;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 			};
@@ -1066,7 +1053,6 @@
 				SDKROOT = appletvos;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 3.0;
 				TARGETED_DEVICE_FAMILY = 3;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 			};