diff --git a/.travis.yml b/.travis.yml
index e2d832d..c337846 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,21 +1,57 @@
+os: osx
 language: objective-c
-osx_image: xcode8.3
-env:
-  - PLATFORM=Mac
-  - PLATFORM=iOS NAME='iPhone SE'
-  - PLATFORM=tvOS NAME='Apple TV 1080p'
+matrix:
+  include:
+    - osx_image: xcode8.2
+      env: PLAT=macOS SWFT=3.0
+    - osx_image: xcode8.2
+      env: PLAT=iOS SWFT=3.0
+    - osx_image: xcode8.2
+      env: PLAT=tvOS SWFT=3.0
+    - osx_image: xcode8.3
+      env: PLAT=macOS SWFT=3.1
+    - osx_image: xcode8.3
+      env: PLAT=iOS SWFT=3.1
+    - osx_image: xcode8.3
+      env: PLAT=tvOS SWFT=3.1
+    - osx_image: xcode9
+      env: PLAT=macOS SWFT=3.2
+    - osx_image: xcode9
+      env: PLAT=iOS SWFT=3.2
+    - osx_image: xcode9
+      env: PLAT=tvOS SWFT=3.2
+    - osx_image: xcode9
+      env: PLAT=macOS SWFT=4.0
+    - osx_image: xcode9
+      env: PLAT=iOS SWFT=4.0
+    - osx_image: xcode9
+      env: PLAT=tvOS SWFT=4.0
 before_install:
-  - if [ -n "$NAME" ]; then
+  - case $PLAT in
+    iOS)
+      NAME="iPhone SE";;
+    tvOS)
+      NAME="Apple TV 1080p";;
+    esac;
+    if [ -n "$NAME" ]; then
       export UUID=$(instruments -s | ruby -e "ARGF.each_line{ |ln| ln =~ /$NAME .* \[(.*)\]/; if \$1; puts(\$1); exit; end }");
+      export DESTINATION="id=$UUID";
     fi
 install:
-  - carthage bootstrap --platform $PLATFORM
+  - case $PLAT in
+    macOS)
+      carthage bootstrap --platform Mac;;
+    tvOS|iOS)
+      carthage bootstrap --platform $PLAT;;
+    esac;
 script:
   - set -o pipefail;
-    case $PLATFORM in
-    Mac)
-      xcodebuild -scheme PMKStoreKit test | xcpretty;;
+    case $PLAT in
+    macOS)
+      xcodebuild -scheme PMKStoreKit -quiet build clean SWIFT_VERSION=$SWFT;
+      xcodebuild -scheme PMKStoreKit -quiet test;;
     iOS|tvOS)
-      open -a "simulator" --args -CurrentDeviceUDID "$UUID";
-      xcodebuild -scheme PMKStoreKit -destination "id=$UUID" test | xcpretty;;
+      open -b com.apple.iphonesimulator --args -CurrentDeviceUDID "$UUID";
+      xcodebuild -scheme PMKStoreKit -quiet -destination "$DESTINATION" build clean SWIFT_VERSION=$SWFT;
+      xcodebuild -scheme PMKStoreKit -quiet -destination "$DESTINATION" test;;
     esac
diff --git a/PMKStoreKit.xcodeproj/project.pbxproj b/PMKStoreKit.xcodeproj/project.pbxproj
index b0179cc..bd708c8 100644
--- a/PMKStoreKit.xcodeproj/project.pbxproj
+++ b/PMKStoreKit.xcodeproj/project.pbxproj
@@ -94,9 +94,8 @@
 				D3F6DBF21EA245750013E242 /* SKPayment+Promise.swift */,
 				D3F6DBF41EA246340013E242 /* SKReceiptRefreshRequest+Promise.swift */,
 			);
-			name = Sources;
-			path = "PMK+UIKit";
-			sourceTree = "<group>";
+			path = Sources;
+			sourceTree = SOURCE_ROOT;
 		};
 		63C7FFF31D5C020D003BAE60 /* Tests */ = {
 			isa = PBXGroup;
@@ -104,9 +103,8 @@
 				637B4A6F1D5D5FA400E1BC6C /* TestStoreKit.m */,
 				637B4A701D5D5FA400E1BC6C /* TestStoreKit.swift */,
 			);
-			name = Tests;
-			path = PMKTests/NS;
-			sourceTree = "<group>";
+			path = Tests;
+			sourceTree = SOURCE_ROOT;
 		};
 /* End PBXGroup section */
 
@@ -165,17 +163,17 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0800;
-				LastUpgradeCheck = 0800;
+				LastUpgradeCheck = 0900;
 				ORGANIZATIONNAME = "Max Howell";
 				TargetAttributes = {
 					63C7FFA61D5BEE09003BAE60 = {
 						CreatedOnToolsVersion = 8.0;
-						LastSwiftMigration = 0800;
+						LastSwiftMigration = 0900;
 						ProvisioningStyle = Automatic;
 					};
 					63C7FFF11D5C020D003BAE60 = {
 						CreatedOnToolsVersion = 8.0;
-						LastSwiftMigration = 0800;
+						LastSwiftMigration = 0900;
 						ProvisioningStyle = Automatic;
 					};
 				};
@@ -258,7 +256,9 @@
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
 				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
 				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
@@ -266,7 +266,12 @@
 				CLANG_WARN_ENUM_CONVERSION = YES;
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_SUSPICIOUS_MOVES = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
@@ -316,7 +321,9 @@
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
 				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
 				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
@@ -324,7 +331,12 @@
 				CLANG_WARN_ENUM_CONVERSION = YES;
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_SUSPICIOUS_MOVES = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
diff --git a/PMKStoreKit.xcodeproj/xcshareddata/xcschemes/PMKStoreKit.xcscheme b/PMKStoreKit.xcodeproj/xcshareddata/xcschemes/PMKStoreKit.xcscheme
index 1a648fa..442d133 100644
--- a/PMKStoreKit.xcodeproj/xcshareddata/xcschemes/PMKStoreKit.xcscheme
+++ b/PMKStoreKit.xcodeproj/xcshareddata/xcschemes/PMKStoreKit.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0800"
+   LastUpgradeVersion = "0900"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -40,6 +40,7 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      language = ""
       shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
          <TestableReference
@@ -69,6 +70,7 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      language = ""
       launchStyle = "0"
       useCustomWorkingDirectory = "NO"
       ignoresPersistentStateOnLaunch = "NO"
diff --git a/Sources/SKProductsRequest+Promise.swift b/Sources/SKProductsRequest+Promise.swift
index ea09e8e..ad15fc6 100644
--- a/Sources/SKProductsRequest+Promise.swift
+++ b/Sources/SKProductsRequest+Promise.swift
@@ -43,7 +43,10 @@ fileprivate class SKDelegate: NSObject, SKProductsRequestDelegate {
         retainCycle = nil
     }
 
+#if swift(>=3.2)
+#else
     @objc override class func initialize() {
         NSError.registerCancelledErrorDomain(SKErrorDomain, code: SKError.Code.paymentCancelled.rawValue)
     }
+#endif
 }
diff --git a/Tests/TestStoreKit.swift b/Tests/TestStoreKit.swift
index bdb3220..0fcd176 100644
--- a/Tests/TestStoreKit.swift
+++ b/Tests/TestStoreKit.swift
@@ -20,6 +20,8 @@ class SKProductsRequestTests: XCTestCase {
         waitForExpectations(timeout: 1, handler: nil)
     }
 
+#if swift(>=3.2)
+#else
     func testCancellation() {
         class MockProductsRequest: SKProductsRequest {
             override func start() {
@@ -37,4 +39,5 @@ class SKProductsRequestTests: XCTestCase {
         }
         waitForExpectations(timeout: 1, handler: nil)
     }
+#endif
 }