diff --git a/build.gradle b/build.gradle
index 218a940..7e4254e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -8,17 +8,16 @@ buildscript {
 }
 
 plugins {
-	id "org.sonarqube" version "1.2"
+	id 'java'
+	id 'eclipse'
+	id 'idea'
+	id 'jacoco'
+	id 'org.sonarqube' version '1.2'
+	id 'checkstyle'
 }
-
 description = 'Spring Integration AWS Support'
 
-apply plugin: 'java'
 apply from: "${rootProject.projectDir}/publish-maven.gradle"
-apply plugin: 'eclipse'
-apply plugin: 'idea'
-apply plugin: 'jacoco'
-apply plugin: 'checkstyle'
 
 group = 'org.springframework.integration'
 
@@ -56,7 +55,7 @@ ext {
 	servletApiVersion = '3.1.0'
 	slf4jVersion = '1.7.21'
 	springCloudAwsVersion = '1.1.1.RELEASE'
-	springIntegrationVersion = '4.3.1.RELEASE'
+	springIntegrationVersion = '4.3.2.RELEASE'
 
 	idPrefix = 'aws'
 
@@ -77,8 +76,8 @@ jacoco {
 }
 
 checkstyle {
-	configFile = file('src/checkstyle/checkstyle.xml')
-	toolVersion = "7.1"
+	configFile = file("${rootDir}/src/checkstyle/checkstyle.xml")
+	toolVersion = "6.16.1"
 }
 
 dependencies {
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index d3b8398..6ffa237 100644
Binary files a/gradle/wrapper/gradle-wrapper.jar and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index a09eb8a..cf84e25 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Thu Jun 23 12:52:13 EDT 2016
+#Mon Sep 19 16:49:42 EDT 2016
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.14-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.1-bin.zip
diff --git a/gradlew b/gradlew
index 27309d9..9aa616c 100755
--- a/gradlew
+++ b/gradlew
@@ -161,4 +161,9 @@ function splitJvmOpts() {
 eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS
 JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME"
 
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [[ "$(uname)" == "Darwin" ]] && [[ "$HOME" == "$PWD" ]]; then
+  cd "$(dirname "$0")"
+fi
+
 exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@"
diff --git a/gradlew.bat b/gradlew.bat
index f6d5974..e95643d 100644
--- a/gradlew.bat
+++ b/gradlew.bat
@@ -49,7 +49,6 @@ goto fail
 @rem Get command-line arguments, handling Windows variants
 
 if not "%OS%" == "Windows_NT" goto win9xME_args
-if "%@eval[2+2]" == "4" goto 4NT_args
 
 :win9xME_args
 @rem Slurp the command line arguments.
@@ -60,11 +59,6 @@ set _SKIP=2
 if "x%~1" == "x" goto execute
 
 set CMD_LINE_ARGS=%*
-goto execute
-
-:4NT_args
-@rem Get arguments from the 4NT Shell from JP Software
-set CMD_LINE_ARGS=%$
 
 :execute
 @rem Setup the command line
diff --git a/src/checkstyle/checkstyle.xml b/src/checkstyle/checkstyle.xml
index 827fb7d..810daf0 100644
--- a/src/checkstyle/checkstyle.xml
+++ b/src/checkstyle/checkstyle.xml
@@ -68,7 +68,6 @@
 		<module name="MultipleVariableDeclarations" />
 		<module name="RequireThis">
 			<property name="checkMethods" value="false" />
-			<property name="validateOnlyOverlapping" value="false" />
 		</module>
 		<module name="OneStatementPerLine" />
 
diff --git a/src/main/java/org/springframework/integration/aws/inbound/S3InboundFileSynchronizer.java b/src/main/java/org/springframework/integration/aws/inbound/S3InboundFileSynchronizer.java
index e6d02f9..da05bbc 100644
--- a/src/main/java/org/springframework/integration/aws/inbound/S3InboundFileSynchronizer.java
+++ b/src/main/java/org/springframework/integration/aws/inbound/S3InboundFileSynchronizer.java
@@ -16,11 +16,15 @@
 
 package org.springframework.integration.aws.inbound;
 
+import org.springframework.expression.Expression;
 import org.springframework.expression.common.LiteralExpression;
 import org.springframework.integration.aws.support.S3SessionFactory;
+import org.springframework.integration.aws.support.filters.S3PersistentAcceptOnceFileListFilter;
+import org.springframework.integration.file.filters.FileListFilter;
 import org.springframework.integration.file.remote.session.Session;
 import org.springframework.integration.file.remote.session.SessionFactory;
 import org.springframework.integration.file.remote.synchronizer.AbstractInboundFileSynchronizer;
+import org.springframework.integration.metadata.SimpleMetadataStore;
 
 import com.amazonaws.services.s3.AmazonS3;
 import com.amazonaws.services.s3.model.S3ObjectSummary;
@@ -47,6 +51,17 @@ public class S3InboundFileSynchronizer extends AbstractInboundFileSynchronizer<S
 	public S3InboundFileSynchronizer(SessionFactory<S3ObjectSummary> sessionFactory) {
 		super(sessionFactory);
 		setRemoteDirectoryExpression(new LiteralExpression(null));
+		setFilter(new S3PersistentAcceptOnceFileListFilter(new SimpleMetadataStore(), "s3MessageSource"));
+	}
+
+	@Override
+	public final void setRemoteDirectoryExpression(Expression remoteDirectoryExpression) {
+		super.setRemoteDirectoryExpression(remoteDirectoryExpression);
+	}
+
+	@Override
+	public final void setFilter(FileListFilter<S3ObjectSummary> filter) {
+		super.setFilter(filter);
 	}
 
 	@Override
diff --git a/src/main/java/org/springframework/integration/aws/support/S3FileInfo.java b/src/main/java/org/springframework/integration/aws/support/S3FileInfo.java
index ab4c234..6628b35 100644
--- a/src/main/java/org/springframework/integration/aws/support/S3FileInfo.java
+++ b/src/main/java/org/springframework/integration/aws/support/S3FileInfo.java
@@ -25,7 +25,9 @@ import com.amazonaws.services.s3.model.S3ObjectSummary;
 
 /**
  * An Amazon S3 {@link org.springframework.integration.file.remote.FileInfo} implementation.
+ *
  * @author Christian Tzolov
+ *
  * @since 1.1
  */
 public class S3FileInfo extends AbstractFileInfo<S3ObjectSummary> {