diff --git a/build-extras.gradle b/build-extras.gradle
index 40117b0..77d6180 100644
--- a/build-extras.gradle
+++ b/build-extras.gradle
@@ -3,7 +3,7 @@ android {
     buildToolsVersion "26.0.1"
     
 	defaultConfig {
-		minSdkVersion 19
+		minSdkVersion 21
 		targetSdkVersion 26
 		multiDexEnabled true
 	}