diff --git a/lib/test_process.dart b/lib/test_process.dart
index 3ee5244..cf99b09 100644
--- a/lib/test_process.dart
+++ b/lib/test_process.dart
@@ -149,7 +149,7 @@
     // If the process is already dead, do nothing.
     if (await _exitCodeOrNull != null) return;
 
-    _process.kill(ProcessSignal.SIGKILL);
+    _process.kill(ProcessSignal.sigkill);
 
     // Log output now rather than waiting for the exitCode callback so that
     // it's visible even if we time out waiting for the process to die.
@@ -217,7 +217,7 @@
   ///
   /// If this is called after the process is already dead, it does nothing.
   Future kill() async {
-    _process.kill(ProcessSignal.SIGKILL);
+    _process.kill(ProcessSignal.sigkill);
     await exitCode;
   }
 
diff --git a/pubspec.yaml b/pubspec.yaml
index c98deb8..212a478 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -5,7 +5,7 @@
 homepage: https://github.com/dart-lang/test_process
 
 environment:
-  sdk: '>=2.0.0-dev.17.0 <2.0.0'
+  sdk: '>=2.0.0-dev.55.0 <2.0.0'
 
 dependencies:
   async: ">=1.12.0 <3.0.0"
diff --git a/test/test_process_test.dart b/test/test_process_test.dart
index 03edd26..ad728e8 100644
--- a/test/test_process_test.dart
+++ b/test/test_process_test.dart
@@ -99,12 +99,12 @@
 
   test("signal sends a signal to the process", () async {
     var process = await startDartProcess(r'''
-      ProcessSignal.SIGHUP.watch().listen((_) => print("HUP"));
+      ProcessSignal.sighup.watch().listen((_) => print("HUP"));
       print("ready");
     ''');
 
     await expectLater(process.stdout, emits('ready'));
-    process.signal(ProcessSignal.SIGHUP);
+    process.signal(ProcessSignal.sighup);
     await expectLater(process.stdout, emits('HUP'));
     process.kill();
   }, testOn: "!windows");