diff --git a/.travis.yml b/.travis.yml
index 16d5dbece..7a384d459 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,27 +1,16 @@
 language: android
-#jdk: oraclejdk8
-env:
-  - TEST=unit
-#  - TEST=android ANDROID_TARGET=android-25 ANDROID_ABI=armeabi-v7a ADB_INSTALL_TIMEOUT=10
+
+jdk: oraclejdk8
 
 # force non-container build
 sudo: required
-before_install:
-  - sudo add-apt-repository ppa:openjdk-r/ppa -y
-  - sudo apt-get update
-  - sudo apt-get install -y openjdk-8-jdk
-  - sudo update-alternatives --auto java
-  - sudo update-alternatives --auto javac
-  - export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
-  # workaround for https://github.com/travis-ci/travis-ci/issues/8874
-  - yes | sdkmanager "platforms;android-27"
 
 android:
   components:
     - tools
-    - android-27
+    - android-28
     - platform-tools
-    - build-tools-27.0.3
+    - build-tools-28.0.3
     - extra-android-support
     - extra-android-m2repository
     - sys-img-armeabi-v7a-android-27
@@ -31,9 +20,7 @@ android:
     - 'google-gdk-license-.+'
 
 script:
-  - if [ ${TEST} == "unit" ]; then
-    ./gradlew --stacktrace testDebug jacocoTestReport;
-    fi
+    ./gradlew --stacktrace testDebug
   - if [ ${TEST} == "android" ]; then
     echo no | android create avd --force --name test --target $ANDROID_TARGET --abi $ANDROID_ABI;
     emulator -avd test -no-skin -no-audio -no-window &
diff --git a/README.md b/README.md
index ea71f3c74..bdde68f04 100644
--- a/README.md
+++ b/README.md
@@ -107,13 +107,6 @@ We try to make our builds as [reproducible/deterministic](https://blog.torprojec
 * commit the corresponding [Gradle wrapper](http://www.gradle.org/docs/current/userguide/gradle_wrapper.html) to the repository (allows easy building for new contributors without the need to install the required Gradle version using a package manager)
   
 #### Update SDK and Build Tools
-* Open build.gradle and change:
-```
-ext {
-    compileSdkVersion = 21
-    buildToolsVersion = '21.1.2'
-}
-```
 * Change SDK and Build Tools in git submodules "openkeychain-api-lib" and "openpgp-api-lib" manually. They should also build on their own without the ext variables.
 
 #### Update library
@@ -122,11 +115,10 @@ ext {
 #### Add new library
 * You can add the library as a Maven dependency or as a git submodule (if patches are required) in the "extern" folder.
 * You can get all transitive dependencies with ``./gradlew -q dependencies OpenKeychain:dependencies``
-* If added as a git submodule, change the ``compileSdkVersion`` and ``buildToolsVersion`` in build.gradle to use the variables from the root project:
+* If added as a git submodule, change the ``compileSdkVersion`` in build.gradle to use the variables from the root project:
 ```
 android {
     compileSdkVersion rootProject.ext.compileSdkVersion
-    buildToolsVersion rootProject.ext.buildToolsVersion
 }
 ```
 * You can check for wrong ``compileSdkVersion`` by ``find -name build.gradle | xargs grep compileSdkVersion``
diff --git a/extern/MaterialChipsInput/src/test/java/org/sufficientlysecure/materialchips/ExampleUnitTest.java b/extern/MaterialChipsInput/src/test/java/org/sufficientlysecure/materialchips/ExampleUnitTest.java
deleted file mode 100644
index f5a54cacb..000000000
--- a/extern/MaterialChipsInput/src/test/java/org/sufficientlysecure/materialchips/ExampleUnitTest.java
+++ /dev/null
@@ -1,17 +0,0 @@
-package org.sufficientlysecure.materialchips;
-
-import org.junit.Test;
-
-import static org.junit.Assert.*;
-
-/**
- * Example local unit test, which will execute on the development machine (host).
- *
- * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
- */
-public class ExampleUnitTest {
-    @Test
-    public void addition_isCorrect() throws Exception {
-        assertEquals(4, 2 + 2);
-    }
-}
\ No newline at end of file