diff --git a/library/build.gradle b/library/build.gradle
index fd7e5a4..696f396 100644
--- a/library/build.gradle
+++ b/library/build.gradle
@@ -8,7 +8,7 @@ android {
 
 
     defaultConfig {
-        minSdkVersion 26
+        minSdkVersion 21
         targetSdkVersion 28
         versionCode 1
         versionName "1.0"