diff --git a/build.gradle b/build.gradle
index f3dc3f8..7e1fdb6 100644
--- a/build.gradle
+++ b/build.gradle
@@ -33,7 +33,7 @@ task clean(type: Delete) {
 ext {
     compileSdkVersion = 28
     buildToolsVersion = '28.0.2'
-    minSdkVersion = 17
+    minSdkVersion = 21
     targetSdkVersion = 28
     versionCode = 101000
     versionName = "1.1.0"