diff --git a/packages.txt b/packages.txt
index f564c5a..8507cc6 100644
--- a/packages.txt
+++ b/packages.txt
@@ -1,9 +1,9 @@
 add-ons;addon-google_apis-google-24
-build-tools;29.0.0
+build-tools;28.0.3
 extras;android;m2repository
 extras;google;m2repository
 extras;google;google_play_services
 extras;m2repository;com;android;support;constraint;constraint-layout;1.0.2
 extras;m2repository;com;android;support;constraint;constraint-layout-solver;1.0.2
 platform-tools
-platforms;android-29
+platforms;android-28