diff --git a/build.gradle b/build.gradle
index c194615..8d7d90b 100644
--- a/build.gradle
+++ b/build.gradle
@@ -49,8 +49,9 @@ android {
         versionName libraryVersion
     }
 
-    dexOptions {
-        javaMaxHeapSize "2048m"
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_6
+        targetCompatibility JavaVersion.VERSION_1_6
     }
 
     buildTypes {
diff --git a/src/main/java/com/budiyev/android/circularprogressbar/CircularProgressBar.java b/src/main/java/com/budiyev/android/circularprogressbar/CircularProgressBar.java
index c5b8128..43bda22 100644
--- a/src/main/java/com/budiyev/android/circularprogressbar/CircularProgressBar.java
+++ b/src/main/java/com/budiyev/android/circularprogressbar/CircularProgressBar.java
@@ -739,14 +739,14 @@ private static Paint.Cap getStrokeCap(final int value) {
     private final class ProgressUpdateListener implements ValueAnimator.AnimatorUpdateListener {
         @Override
         public void onAnimationUpdate(final ValueAnimator animation) {
-            setProgressInternal((float) animation.getAnimatedValue());
+            setProgressInternal((Float) animation.getAnimatedValue());
         }
     }
 
     private final class StartUpdateListener implements ValueAnimator.AnimatorUpdateListener {
         @Override
         public void onAnimationUpdate(final ValueAnimator animation) {
-            mIndeterminateStartAngle = (float) animation.getAnimatedValue();
+            mIndeterminateStartAngle = (Float) animation.getAnimatedValue();
             invalidate();
         }
     }
@@ -754,7 +754,7 @@ public void onAnimationUpdate(final ValueAnimator animation) {
     private final class SweepUpdateListener implements ValueAnimator.AnimatorUpdateListener {
         @Override
         public void onAnimationUpdate(final ValueAnimator animation) {
-            mIndeterminateSweepAngle = (float) animation.getAnimatedValue();
+            mIndeterminateSweepAngle = (Float) animation.getAnimatedValue();
         }
     }