diff --git a/src/TulsiGeneratorIntegrationTests/AspectTests.swift b/src/TulsiGeneratorIntegrationTests/AspectTests.swift
index 6341745..297fdcc 100644
--- a/src/TulsiGeneratorIntegrationTests/AspectTests.swift
+++ b/src/TulsiGeneratorIntegrationTests/AspectTests.swift
@@ -468,7 +468,7 @@
     checker.assertThat("//tulsi_test:SwiftLibrary")
         .hasSources(["tulsi_test/SwiftLibrary/srcs/a.swift",
                      "tulsi_test/SwiftLibrary/srcs/b.swift"])
-        .hasAttribute(.swift_language_version, value: "3")
+        .hasAttribute(.has_swift_dependency, value: true)
 
     checker.assertThat("//tulsi_test:SwiftLibraryV3")
         .hasSources(["tulsi_test/SwiftLibraryV3/srcs/a.swift",
diff --git a/src/TulsiGeneratorIntegrationTests/Resources/GoldenProjects/SimpleSkylarkProject.xcodeproj/project.pbxproj b/src/TulsiGeneratorIntegrationTests/Resources/GoldenProjects/SimpleSkylarkProject.xcodeproj/project.pbxproj
index 8d7b653..3ece242 100644
--- a/src/TulsiGeneratorIntegrationTests/Resources/GoldenProjects/SimpleSkylarkProject.xcodeproj/project.pbxproj
+++ b/src/TulsiGeneratorIntegrationTests/Resources/GoldenProjects/SimpleSkylarkProject.xcodeproj/project.pbxproj
@@ -799,7 +799,7 @@
 				ONLY_ACTIVE_ARCH = YES;
 				PYTHONIOENCODING = utf8;
 				SDKROOT = iphoneos;
-				SWIFT_VERSION = 3;
+				SWIFT_VERSION = 4.0;
 				TULSI_BWRS = "${TULSI_WR}/tulsi-workspace";
 				TULSI_PROJECT = SimpleSkylarkProject;
 				TULSI_VERSION = 9.99.999.9999;
@@ -1002,7 +1002,7 @@
 				ONLY_ACTIVE_ARCH = YES;
 				PYTHONIOENCODING = utf8;
 				SDKROOT = iphoneos;
-				SWIFT_VERSION = 3;
+				SWIFT_VERSION = 4.0;
 				TULSI_BWRS = "${TULSI_WR}/tulsi-workspace";
 				TULSI_MUST_USE_DSYM = YES;
 				TULSI_PROJECT = SimpleSkylarkProject;
@@ -1233,7 +1233,7 @@
 				SDKROOT = iphoneos;
 				SWIFT_INSTALL_OBJC_HEADER = NO;
 				SWIFT_OBJC_INTERFACE_HEADER_NAME = "$(PRODUCT_NAME).h";
-				SWIFT_VERSION = 3;
+				SWIFT_VERSION = 4.0;
 				TULSI_BWRS = "${TULSI_WR}/tulsi-workspace";
 				TULSI_PROJECT = SimpleSkylarkProject;
 				TULSI_VERSION = 9.99.999.9999;
@@ -1409,7 +1409,7 @@
 				SDKROOT = iphoneos;
 				SWIFT_INSTALL_OBJC_HEADER = NO;
 				SWIFT_OBJC_INTERFACE_HEADER_NAME = "$(PRODUCT_NAME).h";
-				SWIFT_VERSION = 3;
+				SWIFT_VERSION = 4.0;
 				TULSI_BWRS = "${TULSI_WR}/tulsi-workspace";
 				TULSI_MUST_USE_DSYM = YES;
 				TULSI_PROJECT = SimpleSkylarkProject;