diff --git a/app/build.gradle b/app/build.gradle
index 66aa61d..6ca1853 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -2,7 +2,7 @@ apply plugin: 'com.android.application'
 
 android {
     compileSdkVersion 21
-    buildToolsVersion "21.1.2"
+    buildToolsVersion "21.1.1"
 
     defaultConfig {
         applicationId "me.datenknoten.tueroeffner"