diff --git a/.travis.yml b/.travis.yml
index 640d0a8..df7672b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,9 @@
 language: node_js
 node_js:
 - '8'
-- '9'
 - '10'
+- '11'
+- '12'
 before_install: yarn global add greenkeeper-lockfile@1
 before_script: greenkeeper-lockfile-update
 script: yarn test
diff --git a/package.json b/package.json
index d403054..fd17be6 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@lifeomic/bitrise",
-  "version": "0.4.0",
+  "version": "0.5.0-alpha",
   "description": "Bitrise API client",
   "main": "src/client.js",
   "repository": {
diff --git a/test/build.test.js b/test/build.test.js
index d4816a0..0a19ff6 100644
--- a/test/build.test.js
+++ b/test/build.test.js
@@ -94,7 +94,7 @@ test.serial('following a failed build that has not finished prints the log outpu
   const write = sinon.stub(process.stdout, 'write');
 
   try {
-    await test.throws(build.follow());
+    await test.throwsAsync(() => build.follow());
 
     for (const chunk of logChunks) {
       sinon.assert.calledWithExactly(write, chunk);
@@ -134,7 +134,7 @@ test('following a failed build that has already finished prints the log output a
   const write = sinon.stub(process.stdout, 'write');
 
   try {
-    await test.throws(build.follow());
+    await test.throwsAsync(() => build.follow());
     sinon.assert.calledWithExactly(write, logText);
   } finally {
     write.restore();
diff --git a/test/client.test.js b/test/client.test.js
index 0cbc516..e6fdedd 100644
--- a/test/client.test.js
+++ b/test/client.test.js
@@ -100,7 +100,7 @@ test.serial('a client gives up after too many retries', async (test) => {
 
     sinon.assert.calledOnce(create);
     const httpClient = create.firstCall.returnValue;
-    const { response } = await test.throws(httpClient.get('http://localhost/error'));
+    const { response } = await test.throwsAsync(() => httpClient.get('http://localhost/error'));
     test.is(response.status, 500);
   } finally {
     create.restore();