diff --git a/Promises.xcodeproj/project.pbxproj b/Promises.xcodeproj/project.pbxproj
index b4110ce..cb07ebb 100644
--- a/Promises.xcodeproj/project.pbxproj
+++ b/Promises.xcodeproj/project.pbxproj
@@ -1351,7 +1351,7 @@
 				OTHER_LDFLAGS = "$(inherited)";
 				OTHER_SWIFT_FLAGS = "$(inherited)";
 				PRODUCT_BUNDLE_IDENTIFIER = "$(PRODUCT_NAME)";
-				SWIFT_VERSION = 5;
+				SWIFT_VERSION = 5.0;
 				TARGET_NAME = FBLPromisesInteroperabilityTests;
 			};
 			name = Debug;
@@ -1375,7 +1375,7 @@
 				OTHER_LDFLAGS = "$(inherited)";
 				OTHER_SWIFT_FLAGS = "$(inherited)";
 				PRODUCT_BUNDLE_IDENTIFIER = "$(PRODUCT_NAME)";
-				SWIFT_VERSION = 5;
+				SWIFT_VERSION = 5.0;
 				TARGET_NAME = FBLPromisesInteroperabilityTests;
 			};
 			name = Release;
@@ -1398,7 +1398,6 @@
 				OTHER_LDFLAGS = "$(inherited)";
 				OTHER_SWIFT_FLAGS = "$(inherited)";
 				PRODUCT_BUNDLE_IDENTIFIER = "$(PRODUCT_NAME)";
-				SWIFT_VERSION = 5;
 				TARGET_NAME = FBLPromisesPerformanceTests;
 			};
 			name = Debug;
@@ -1421,7 +1420,6 @@
 				OTHER_LDFLAGS = "$(inherited)";
 				OTHER_SWIFT_FLAGS = "$(inherited)";
 				PRODUCT_BUNDLE_IDENTIFIER = "$(PRODUCT_NAME)";
-				SWIFT_VERSION = 5;
 				TARGET_NAME = FBLPromisesPerformanceTests;
 			};
 			name = Release;
@@ -1476,7 +1474,6 @@
 				OTHER_LDFLAGS = "$(inherited)";
 				OTHER_SWIFT_FLAGS = "$(inherited)";
 				PRODUCT_BUNDLE_IDENTIFIER = "$(PRODUCT_NAME)";
-				SWIFT_VERSION = 5;
 				TARGET_NAME = FBLPromisesTests;
 			};
 			name = Debug;
@@ -1499,7 +1496,6 @@
 				OTHER_LDFLAGS = "$(inherited)";
 				OTHER_SWIFT_FLAGS = "$(inherited)";
 				PRODUCT_BUNDLE_IDENTIFIER = "$(PRODUCT_NAME)";
-				SWIFT_VERSION = 5;
 				TARGET_NAME = FBLPromisesTests;
 			};
 			name = Release;
@@ -1668,7 +1664,6 @@
 				PRODUCT_MODULE_NAME = "$(TARGET_NAME:c99extidentifier)";
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 5;
 				TARGET_NAME = FBLPromisesTestHelpers;
 			};
 			name = Debug;
@@ -1695,7 +1690,6 @@
 				PRODUCT_MODULE_NAME = "$(TARGET_NAME:c99extidentifier)";
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 5;
 				TARGET_NAME = FBLPromisesTestHelpers;
 			};
 			name = Release;
@@ -1722,7 +1716,6 @@
 				PRODUCT_MODULE_NAME = "$(TARGET_NAME:c99extidentifier)";
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 5;
 				TARGET_NAME = FBLPromises;
 			};
 			name = Debug;
@@ -1749,7 +1742,6 @@
 				PRODUCT_MODULE_NAME = "$(TARGET_NAME:c99extidentifier)";
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 5;
 				TARGET_NAME = FBLPromises;
 			};
 			name = Release;
@@ -1800,7 +1792,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SUPPORTED_PLATFORMS = "macosx iphoneos iphonesimulator appletvos appletvsimulator watchos watchsimulator";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 				USE_HEADERMAP = NO;
 				WATCHOS_DEPLOYMENT_TARGET = 2.0;
@@ -1850,7 +1842,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SUPPORTED_PLATFORMS = "macosx iphoneos iphonesimulator appletvos appletvsimulator watchos watchsimulator";
 				SWIFT_COMPILATION_MODE = wholemodule;
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 				USE_HEADERMAP = NO;
 				WATCHOS_DEPLOYMENT_TARGET = 2.0;
diff --git a/PromisesSwift.podspec b/PromisesSwift.podspec
index dae8f89..4f08320 100644
--- a/PromisesSwift.podspec
+++ b/PromisesSwift.podspec
@@ -16,7 +16,6 @@ Pod::Spec.new do |s|
   s.osx.deployment_target  = '10.10'
   s.tvos.deployment_target = '9.0'
   s.watchos.deployment_target = '2.0'
-  s.swift_version = '5'
 
   s.module_name = 'Promises'
   s.source_files = "Sources/#{s.module_name}/*.{swift}"