diff --git a/.travis.yml b/.travis.yml
index 351434fc..6cfbe40d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -45,6 +45,8 @@ cache:
 before_script:
   - cp -f app/mock-google-services.json app/google-services.json
   - cat app/keys.properties.example | envsubst > app/keys.properties
+  - yes | sdkmanager "platforms;android-28"
+  - yes | sdkmanager "build-tools;28.0.3"
 
 script:
 #  - ./gradlew connectedAndroidTest --stacktrace -w
diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index b7ecf72e..506cda9e 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -3,7 +3,15 @@
 -dontskipnonpubliclibraryclasses
 -dontpreverify
 -verbose
--libraryjars libs
+
+-libraryjars libs/android-5.1.jar
+-libraryjars libs/dex-ir-1.12.jar
+-libraryjars libs/dex-reader-1.15.jar
+-libraryjars libs/dex-tools-0.0.9.15.jar
+-libraryjars libs/dex-translator-0.0.9.15.jar
+-libraryjars libs/dx-1.16.jar
+-libraryjars libs/jadx-core-0.9.0.jar
+-libraryjars libs/smali-2.2.1.jar
 
 -optimizations !code/simplification/arithmetic,!code/simplification/cast,!field/*,!class/merging/*,!code/allocation/variable
 -allowaccessmodification