diff --git a/.travis.yml b/.travis.yml
index d0864a7..0bf438f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,8 +9,8 @@ matrix:
         - sudo apt-get install clang libicu-dev
       before_script:
         - wget "https://swift.org/builds/swift-5.0.3-release/ubuntu1604/swift-5.0.3-RELEASE/swift-5.0.3-RELEASE-ubuntu16.04.tar.gz" -O "/tmp/swift-5.0.3-RELEASE-ubuntu16.04.tar.gz"
-        - tar -xvf "/tmp/swift-5.0.3-RELEASE-ubuntu16.04.tar.gz"
-        - export PATH="$PATH:$PWD/swift-5.0.3-RELEASE-ubuntu16.04/bin"
+        - tar xzf "/tmp/swift-5.0.3-RELEASE-ubuntu16.04.tar.gz"
+        - export PATH="$PATH:$PWD/swift-5.0.3-RELEASE-ubuntu16.04/usr/bin"
     - os: osx
       osx_image: xcode11.3
 
diff --git a/Package.swift b/Package.swift
index f2296c6..d067515 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version:5.0
+// swift-tools-version:5.1
 
 import PackageDescription
 
@@ -31,7 +31,6 @@ let package = Package(
       name: "EchoTests",
       dependencies: ["Echo"]
     )
-  ],
-  swiftLanguageVersions: [.v5]
+  ]
 )
 
diff --git a/Tests/EchoTests/Context Descriptor/AnonymousDescriptor.swift b/Tests/EchoTests/Context Descriptor/AnonymousDescriptor.swift
index 3816c07..444d3c5 100644
--- a/Tests/EchoTests/Context Descriptor/AnonymousDescriptor.swift	
+++ b/Tests/EchoTests/Context Descriptor/AnonymousDescriptor.swift	
@@ -9,7 +9,9 @@ struct AnonymousFoo {
     let metadata = reflect(AnonymousBar.self) as! StructMetadata
     let parent = metadata.descriptor.parent! as! AnonymousDescriptor
     XCTAssertTrue(parent.anonymousFlags.hasMangledName)
-    let mangledName = try XCTUnwrap(parent.mangledName)
+    // XCTUnwrap is unavailble from swift test atm
+    //let mangledName = try XCTUnwrap(parent.mangledName)
+    let mangledName = parent.mangledName!
     XCTAssertEqual(
       mangledName,
       "$s9EchoTests12AnonymousFooV0C3Bar33_16BDE84827F25937B00C6B35A30DC536LLV"
@@ -20,7 +22,9 @@ struct AnonymousFoo {
     let metadata = reflect(AnonymousGenericBar<Int>.self) as! StructMetadata
     let parent = metadata.descriptor.parent! as! AnonymousDescriptor
     XCTAssertTrue(parent.anonymousFlags.hasMangledName)
-    let mangledName = try XCTUnwrap(parent.mangledName)
+    // XCTUnwrap is unavailable from swift test atm
+    //let mangledName = try XCTUnwrap(parent.mangledName)
+    let mangledName = parent.mangledName!
     XCTAssertEqual(
       mangledName,
       "$s9EchoTests12AnonymousFooV0C10GenericBar33_16BDE84827F25937B00C6B35A30DC536LLV"