diff --git a/app/build.gradle b/app/build.gradle
index 74fc93b8..a71dc030 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -68,7 +68,7 @@ ext {
     databindingVersion = '3.1.3'
     jsr305Version = '3.0.2'
     streamsupportVersion = '1.6.0'
-    supportLibsVersion = '28.0.0'
+    supportLibsVersion = '27.1.1'
     threetenabpVersion = '1.1.1'
     zxingEmbeddedVersion = '3.6.0'
 }