diff --git a/.travis.yml b/.travis.yml
index a0653e3..1acfc69 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,7 +2,6 @@
 
 dart:
   - dev
-  - stable
 
 dart_task:
   - test
diff --git a/CHANGELOG.md b/CHANGELOG.md
index cbdb5cd..46908ef 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 1.1.1
+
+* Update to lowercase Dart core library constants.
+
 ## 1.1.0
 
 * Add a `path()` function that returns the a path within the sandbox directory.
diff --git a/analysis_options.yaml b/analysis_options.yaml
deleted file mode 100644
index a10d4c5..0000000
--- a/analysis_options.yaml
+++ /dev/null
@@ -1,2 +0,0 @@
-analyzer:
-  strong-mode: true
diff --git a/lib/src/file_descriptor.dart b/lib/src/file_descriptor.dart
index 93dec58..5220b6e 100644
--- a/lib/src/file_descriptor.dart
+++ b/lib/src/file_descriptor.dart
@@ -38,7 +38,7 @@
   factory FileDescriptor(String name, contents) {
     if (contents is String) return new _StringFileDescriptor(name, contents);
     if (contents is List) {
-      return new _BinaryFileDescriptor(name, DelegatingList.typed(contents));
+      return new _BinaryFileDescriptor(name, contents.cast<int>());
     }
     if (contents == null) return new _BinaryFileDescriptor(name, []);
     return new _MatcherFileDescriptor(name, contents);
diff --git a/pubspec.yaml b/pubspec.yaml
index af77fab..68e91db 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,11 +1,11 @@
 name: test_descriptor
-version: 1.1.0
+version: 1.1.1
 description: An API for defining and verifying directory structures.
 author: Dart Team <misc@dartlang.org>
 homepage: https://github.com/dart-lang/test_descriptor
 
 environment:
-  sdk: '>=1.21.0 <2.0.0'
+  sdk: '>=2.0.0-dev.36.0 <3.0.0'
 
 dependencies:
   async: '>=1.10.0 <3.0.0'
diff --git a/test/directory_test.dart b/test/directory_test.dart
index 97dcacb..d455e16 100644
--- a/test/directory_test.dart
+++ b/test/directory_test.dart
@@ -136,7 +136,7 @@
     test("loads a file", () {
       var dir = d.dir('dir',
           [d.file('name.txt', 'contents'), d.file('other.txt', 'wrong')]);
-      expect(UTF8.decodeStream(dir.load('name.txt')),
+      expect(utf8.decodeStream(dir.load('name.txt')),
           completion(equals('contents')));
     });
 
@@ -148,7 +148,7 @@
         d.file('name.txt', 'contents')
       ]);
 
-      expect(UTF8.decodeStream(dir.load('subdir/name.txt')),
+      expect(utf8.decodeStream(dir.load('subdir/name.txt')),
           completion(equals('subcontents')));
     });
 
@@ -206,7 +206,7 @@
       ]);
 
       expect(
-          UTF8.decodeStream(dir.load('name')), completion(equals('contents')));
+          utf8.decodeStream(dir.load('name')), completion(equals('contents')));
     });
   });
 
diff --git a/test/file_test.dart b/test/file_test.dart
index 70093c1..cbc670a 100644
--- a/test/file_test.dart
+++ b/test/file_test.dart
@@ -139,7 +139,7 @@
 
     test("readAsBytes() returns the contents of a text file as a byte stream",
         () {
-      expect(UTF8.decodeStream(d.file('name.txt', 'contents').readAsBytes()),
+      expect(utf8.decodeStream(d.file('name.txt', 'contents').readAsBytes()),
           completion(equals('contents')));
     });
 
diff --git a/test/sandbox_test.dart b/test/sandbox_test.dart
index 34c90ac..be4a959 100644
--- a/test/sandbox_test.dart
+++ b/test/sandbox_test.dart
@@ -4,8 +4,6 @@
 
 @TestOn('vm')
 
-import 'dart:async';
-import 'dart:convert';
 import 'dart:io';
 
 import 'package:path/path.dart' as p;
@@ -13,8 +11,6 @@
 
 import 'package:test_descriptor/test_descriptor.dart' as d;
 
-import 'utils.dart';
-
 void main() {
   test("accessing the getter creates the directory", () {
     expect(new Directory(d.sandbox).existsSync(), isTrue);