diff --git a/bluetooth_library/build.gradle b/bluetooth_library/build.gradle
index 079137c..99df5cf 100644
--- a/bluetooth_library/build.gradle
+++ b/bluetooth_library/build.gradle
@@ -9,8 +9,8 @@ android {
     defaultConfig {
         minSdkVersion 21
         targetSdkVersion 30
-        versionCode 10200
-        versionName "1.2.0"
+        versionCode 10201
+        versionName "1.2.1"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
         vectorDrawables.useSupportLibrary = true
     }
diff --git a/build.gradle b/build.gradle
index 916f78d..d4f6bd7 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,13 +1,13 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    ext.kotlin_version = '1.3.20'
+    ext.kotlin_version = '1.4.0'
     repositories {
         jcenter()
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.3'
+        classpath 'com.android.tools.build:gradle:4.0.2'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files