diff --git a/build.gradle b/build.gradle
index e220f0b8..59660130 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,7 +5,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.1.2'
+        classpath 'com.android.tools.build:gradle:2.3.3'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/example/build.gradle b/example/build.gradle
index 3aae2cce..8560676b 100644
--- a/example/build.gradle
+++ b/example/build.gradle
@@ -2,7 +2,7 @@ apply plugin: 'com.android.application'
 
 android {
     compileSdkVersion 24
-    buildToolsVersion "24.0.1"
+    buildToolsVersion '25.0.0'
 
     defaultConfig {
         applicationId "net.ypresto.androidtranscoder.example"
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index d14f516d..9555d195 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Mon Mar 09 14:43:12 JST 2015
+#Thu Jun 08 12:40:11 IST 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.14.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip
diff --git a/lib/build.gradle b/lib/build.gradle
index 1b6e8f17..fe6550f9 100644
--- a/lib/build.gradle
+++ b/lib/build.gradle
@@ -12,7 +12,7 @@ apply plugin: 'bintray-release'
 
 android {
     compileSdkVersion 24
-    buildToolsVersion "24.0.1"
+    buildToolsVersion '25.0.2'
 
     defaultConfig {
         minSdkVersion 18
diff --git a/lib/src/main/java/net/ypresto/androidtranscoder/engine/MediaTranscoderEngine.java b/lib/src/main/java/net/ypresto/androidtranscoder/engine/MediaTranscoderEngine.java
index 64a1edef..e56e307b 100644
--- a/lib/src/main/java/net/ypresto/androidtranscoder/engine/MediaTranscoderEngine.java
+++ b/lib/src/main/java/net/ypresto/androidtranscoder/engine/MediaTranscoderEngine.java
@@ -180,7 +180,7 @@ public void onDetermineOutputFormat() {
         mExtractor.selectTrack(trackResult.mAudioTrackIndex);
     }
 
-    private void runPipelines() {
+    private void runPipelines() throws InterruptedException {
         long loopCount = 0;
         if (mDurationUs <= 0) {
             double progress = PROGRESS_UNKNOWN;
@@ -199,11 +199,7 @@ private void runPipelines() {
                 if (mProgressCallback != null) mProgressCallback.onProgress(progress);
             }
             if (!stepped) {
-                try {
-                    Thread.sleep(SLEEP_TO_WAIT_TRACK_TRANSCODERS);
-                } catch (InterruptedException e) {
-                    // nothing to do
-                }
+                Thread.sleep(SLEEP_TO_WAIT_TRACK_TRANSCODERS);
             }
         }
     }