diff --git a/pom.xml b/pom.xml
index 7fe6725f..2e650cc8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -23,7 +23,7 @@
     </licenses>
 
     <properties>
-        <aws-java-sdk.version>1.10.61</aws-java-sdk.version>
+        <aws-java-sdk.version>1.11.5</aws-java-sdk.version>
     </properties>
 
     <dependencies>
diff --git a/src/main/java/com/amazonaws/services/kinesis/clientlibrary/proxies/KinesisProxy.java b/src/main/java/com/amazonaws/services/kinesis/clientlibrary/proxies/KinesisProxy.java
index d853cebc..36c62e49 100644
--- a/src/main/java/com/amazonaws/services/kinesis/clientlibrary/proxies/KinesisProxy.java
+++ b/src/main/java/com/amazonaws/services/kinesis/clientlibrary/proxies/KinesisProxy.java
@@ -21,6 +21,8 @@ import java.util.List;
 import java.util.Set;
 import java.util.concurrent.atomic.AtomicReference;
 
+import com.amazonaws.regions.Region;
+import com.amazonaws.regions.Regions;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
@@ -82,7 +84,7 @@ public class KinesisProxy implements IKinesisProxyExtended {
      * @param streamName Data records will be fetched from this stream
      * @param credentialProvider Provides credentials for signing Kinesis requests
      * @param endpoint Kinesis endpoint
-     * @param serviceName service name
+     * @param serviceName This parameter is ignored
      * @param regionId region id
      * @param describeStreamBackoffTimeInMillis Backoff time for DescribeStream calls in milliseconds
      * @param maxDescribeStreamRetryAttempts Number of retry attempts for DescribeStream calls
@@ -96,7 +98,6 @@ public class KinesisProxy implements IKinesisProxyExtended {
             int maxDescribeStreamRetryAttempts) {
         this(streamName, credentialProvider, buildClientSettingEndpoint(credentialProvider,
                 endpoint,
-                serviceName,
                 regionId), describeStreamBackoffTimeInMillis, maxDescribeStreamRetryAttempts);
         
 
@@ -105,10 +106,10 @@ public class KinesisProxy implements IKinesisProxyExtended {
     
     private static AmazonKinesisClient buildClientSettingEndpoint(AWSCredentialsProvider credentialProvider,
             String endpoint,
-            String serviceName,
             String regionId) {
         AmazonKinesisClient client = new AmazonKinesisClient(credentialProvider);
-        client.setEndpoint(endpoint, serviceName, regionId);
+        client.setRegion(Region.getRegion(Regions.fromName(regionId)));
+        client.setEndpoint(endpoint);
         return client;
     }
 
diff --git a/src/main/java/com/amazonaws/services/kinesis/clientlibrary/proxies/KinesisProxyFactory.java b/src/main/java/com/amazonaws/services/kinesis/clientlibrary/proxies/KinesisProxyFactory.java
index 36605e29..9a225906 100644
--- a/src/main/java/com/amazonaws/services/kinesis/clientlibrary/proxies/KinesisProxyFactory.java
+++ b/src/main/java/com/amazonaws/services/kinesis/clientlibrary/proxies/KinesisProxyFactory.java
@@ -16,6 +16,8 @@ package com.amazonaws.services.kinesis.clientlibrary.proxies;
 
 import com.amazonaws.ClientConfiguration;
 import com.amazonaws.auth.AWSCredentialsProvider;
+import com.amazonaws.regions.Region;
+import com.amazonaws.regions.Regions;
 import com.amazonaws.services.kinesis.AmazonKinesis;
 import com.amazonaws.services.kinesis.AmazonKinesisClient;
 
@@ -40,7 +42,7 @@ public class KinesisProxyFactory implements IKinesisProxyFactory {
      * @param endpoint Amazon Kinesis endpoint to use
      */
     public KinesisProxyFactory(AWSCredentialsProvider credentialProvider, String endpoint) {
-        this(credentialProvider, new ClientConfiguration(), endpoint, defaultServiceName, defaultRegionId,
+        this(credentialProvider, new ClientConfiguration(), endpoint, defaultRegionId,
                 DEFAULT_DESCRIBE_STREAM_BACKOFF_MILLIS, DEFAULT_DESCRIBE_STREAM_RETRY_TIMES);
     }
 
@@ -54,7 +56,7 @@ public class KinesisProxyFactory implements IKinesisProxyFactory {
     public KinesisProxyFactory(AWSCredentialsProvider credentialProvider,
             ClientConfiguration clientConfig,
             String endpoint) {
-        this(credentialProvider, clientConfig, endpoint, defaultServiceName, defaultRegionId,
+        this(credentialProvider, clientConfig, endpoint, defaultRegionId,
                 DEFAULT_DESCRIBE_STREAM_BACKOFF_MILLIS, DEFAULT_DESCRIBE_STREAM_RETRY_TIMES);
     }
 
@@ -74,7 +76,6 @@ public class KinesisProxyFactory implements IKinesisProxyFactory {
      * @param credentialProvider credentials provider used to sign requests
      * @param clientConfig Client Configuration used when instantiating an AmazonKinesisClient
      * @param endpoint Amazon Kinesis endpoint to use
-     * @param serviceName service name
      * @param regionId region id
      * @param describeStreamBackoffTimeInMillis backoff time for describing stream in millis
      * @param maxDescribeStreamRetryAttempts Number of retry attempts for DescribeStream calls
@@ -82,14 +83,12 @@ public class KinesisProxyFactory implements IKinesisProxyFactory {
     KinesisProxyFactory(AWSCredentialsProvider credentialProvider,
             ClientConfiguration clientConfig,
             String endpoint,
-            String serviceName,
             String regionId,
             long describeStreamBackoffTimeInMillis,
             int maxDescribeStreamRetryAttempts) {
         this(credentialProvider, buildClientSettingEndpoint(credentialProvider,
                 clientConfig,
                 endpoint,
-                serviceName,
                 regionId),
                 describeStreamBackoffTimeInMillis, maxDescribeStreamRetryAttempts);
         
@@ -130,10 +129,10 @@ public class KinesisProxyFactory implements IKinesisProxyFactory {
     private static AmazonKinesisClient buildClientSettingEndpoint(AWSCredentialsProvider credentialProvider,
             ClientConfiguration clientConfig,
             String endpoint,
-            String serviceName,
             String regionId) {
         AmazonKinesisClient client = new AmazonKinesisClient(credentialProvider, clientConfig);
-        client.setEndpoint(endpoint, serviceName, regionId);
+        client.setRegion(Region.getRegion(Regions.fromName(regionId)));
+        client.setEndpoint(endpoint);
         return client;
     }
 }
diff --git a/src/main/java/com/amazonaws/services/kinesis/leases/impl/Lease.java b/src/main/java/com/amazonaws/services/kinesis/leases/impl/Lease.java
index 3cb365fb..f6081d9b 100644
--- a/src/main/java/com/amazonaws/services/kinesis/leases/impl/Lease.java
+++ b/src/main/java/com/amazonaws/services/kinesis/leases/impl/Lease.java
@@ -14,11 +14,11 @@
  */
 package com.amazonaws.services.kinesis.leases.impl;
 
+import com.amazonaws.util.json.Jackson;
+
 import java.util.UUID;
 import java.util.concurrent.TimeUnit;
 
-import com.amazonaws.util.json.JSONObject;
-
 /**
  * This class contains data pertaining to a Lease. Distributed systems may use leases to partition work across a
  * fleet of workers. Each unit of work (identified by a leaseKey) has a corresponding Lease. Every worker will contend
@@ -226,7 +226,7 @@ public class Lease {
 
     @Override
     public String toString() {
-        return new JSONObject(this).toString();
+       return Jackson.toJsonPrettyString(this);
     }
 
     /**