diff --git a/README.md b/README.md
index cd0c910..f853e20 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@ Installation
 ====
 ```groovy
 dependencies {
-    compile 'com.loopeer.lib:shadow:0.0.3'
+    compile 'com.loopeer.lib:shadow:0.0.4'
 }
 ```
 Usages
diff --git a/build.gradle b/build.gradle
index b5cc992..224e648 100644
--- a/build.gradle
+++ b/build.gradle
@@ -10,7 +10,7 @@ buildscript {
         maven { url "https://jitpack.io" }
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.0-beta6'
+        classpath 'com.android.tools.build:gradle:3.0.1'
         classpath 'com.github.dcendents:android-maven-gradle-plugin:1.5'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
@@ -33,16 +33,16 @@ task clean(type: Delete) {
 
 ext {
     configs = [
-            compileSdkVersion: 26,
-            buildToolsVersion: '26.0.1',
+            compileSdkVersion: 27,
+            buildToolsVersion: '27.0.2',
             minSdkVersion    : 17,
-            targetSdkVersion : 26,
+            targetSdkVersion : 27,
             versionCode      : 1,
             versionName      : '1.0.0',
     ]
 
-    supportLibraryVersion = '26.1.0'
-    constraintVersion = '1.1.0-beta1'
+    supportLibraryVersion = '27.0.2'
+    constraintVersion = '1.1.0-beta4'
     flexboxVersion = '0.3.0'
 
     libs = [appcompatV7     : "com.android.support:appcompat-v7:$supportLibraryVersion",
diff --git a/shadow/bintray.gradle b/shadow/bintray.gradle
index 8e537b4..b450831 100644
--- a/shadow/bintray.gradle
+++ b/shadow/bintray.gradle
@@ -2,7 +2,7 @@ apply plugin: 'com.github.dcendents.android-maven'
 apply plugin: 'com.jfrog.bintray'
 apply plugin: 'maven'
 
-version = "0.0.3"
+version = "0.0.4"
 
 uploadArchives {
     repositories {
diff --git a/shadow/src/main/java/com/loopeer/shadow/ShadowView.kt b/shadow/src/main/java/com/loopeer/shadow/ShadowView.kt
index 5b1b550..6fb9193 100644
--- a/shadow/src/main/java/com/loopeer/shadow/ShadowView.kt
+++ b/shadow/src/main/java/com/loopeer/shadow/ShadowView.kt
@@ -105,7 +105,7 @@ open class ShadowView @JvmOverloads constructor(context: Context?, attributeSet:
                 , ContextCompat.getColor(context, R.color.shadow_view_foreground_color_dark))
         backgroundClr = a.getColor(R.styleable.ShadowView_backgroundColor, Color.WHITE)
         shadowDx = a.getFloat(R.styleable.ShadowView_shadowDx, 0f)
-        shadowDy = a.getFloat(R.styleable.ShadowView_shadowDy, 0f)
+        shadowDy = a.getFloat(R.styleable.ShadowView_shadowDy, 1f)
         shadowRadius = a.getDimensionPixelSize(R.styleable.ShadowView_shadowRadius, SIZE_DEFAULT).toFloat()
         val d = a.getDrawable(R.styleable.ShadowView_android_foreground)
         if (d != null) {
@@ -141,8 +141,6 @@ open class ShadowView @JvmOverloads constructor(context: Context?, attributeSet:
         bgPaint.color = backgroundClr
         bgPaint.isAntiAlias = true
         bgPaint.style = Paint.Style.FILL
-        bgPaint.setShadowLayer(shadowRadius, 0f, 1f,
-                shadowColor)
         setLayerType(LAYER_TYPE_SOFTWARE, null)
         setWillNotDraw(false)
         background = null