diff --git a/build.gradle b/build.gradle
index abad98f..be51d5a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,12 +1,15 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    ext.kotlin_version = '1.3.21'
+    ext {
+        kotlin_version = '1.3.41'
+        kotlin_cotoutines_version = '1.2.1'
+    }
     ext.versions = [
             'compileSdk'      : 28,
             'minSdk'          : 21,
             'targetSdk'       : 28,
-            'appcompat'       : '1.0.2',
+            'appcompat'       : '1.1.0',
             'constraintLayout': '1.1.3'
     ]
     repositories {
@@ -14,7 +17,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.4.1'
+        classpath 'com.android.tools.build:gradle:3.4.2'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/studyplus-android-sdk/build.gradle b/studyplus-android-sdk/build.gradle
index d036950..137f45a 100644
--- a/studyplus-android-sdk/build.gradle
+++ b/studyplus-android-sdk/build.gradle
@@ -41,9 +41,8 @@ dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
     implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
 
-    def coroutines = "1.1.1"
-    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutines"
-    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:$coroutines"
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:$kotlin_cotoutines_version"
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:$kotlin_cotoutines_version"
 
     implementation 'androidx.annotation:annotation:1.1.0'