diff --git a/amazon-kinesis-client-multilang/src/main/java/software/amazon/kinesis/multilang/NestedPropertyKey.java b/amazon-kinesis-client-multilang/src/main/java/software/amazon/kinesis/multilang/NestedPropertyKey.java
index 19211822..13acfeb1 100644
--- a/amazon-kinesis-client-multilang/src/main/java/software/amazon/kinesis/multilang/NestedPropertyKey.java
+++ b/amazon-kinesis-client-multilang/src/main/java/software/amazon/kinesis/multilang/NestedPropertyKey.java
@@ -15,13 +15,14 @@
 package software.amazon.kinesis.multilang;
 
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 
-import com.amazonaws.regions.Regions;
 import com.google.common.base.CaseFormat;
 import lombok.AccessLevel;
 import lombok.Getter;
 import lombok.extern.slf4j.Slf4j;
+import software.amazon.awssdk.regions.Region;
 
 /**
  * Key-Value pairs which may be nested in, and extracted from, a property value
@@ -73,8 +74,13 @@ public enum NestedPropertyKey {
      * @see <a href="https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-regions-availability-zones.html#concepts-regions">Available Regions</a>
      */
     ENDPOINT_REGION {
-        void visit(final NestedPropertyProcessor processor, final String region) {
-            processor.acceptEndpointRegion(Regions.fromName(region));
+        void visit(final NestedPropertyProcessor processor, final String regionName) {
+            List<Region> validRegions = Region.regions();
+            Region region = Region.of(regionName);
+            if (!validRegions.contains(region)) {
+                throw new IllegalArgumentException("Invalid region name: " + regionName);
+            }
+            processor.acceptEndpointRegion(region);
         }
     },
 
diff --git a/amazon-kinesis-client-multilang/src/main/java/software/amazon/kinesis/multilang/NestedPropertyProcessor.java b/amazon-kinesis-client-multilang/src/main/java/software/amazon/kinesis/multilang/NestedPropertyProcessor.java
index f7587297..a0b9c3b4 100644
--- a/amazon-kinesis-client-multilang/src/main/java/software/amazon/kinesis/multilang/NestedPropertyProcessor.java
+++ b/amazon-kinesis-client-multilang/src/main/java/software/amazon/kinesis/multilang/NestedPropertyProcessor.java
@@ -14,7 +14,7 @@
  */
 package software.amazon.kinesis.multilang;
 
-import com.amazonaws.regions.Regions;
+import software.amazon.awssdk.regions.Region;
 
 /**
  * Defines methods to process {@link NestedPropertyKey}s.
@@ -28,7 +28,7 @@ public interface NestedPropertyProcessor {
      *      (e.g., https://sns.us-west-1.amazonaws.com, sns.us-west-1.amazonaws.com)
      * @param signingRegion the region to use for SigV4 signing of requests (e.g. us-west-1)
      *
-     * @see #acceptEndpointRegion(Regions)
+     * @see #acceptEndpointRegion(Region)
      * @see <a href="https://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/client/builder/AwsClientBuilder.EndpointConfiguration.html">
      *     AwsClientBuilder.EndpointConfiguration</a>
      */
@@ -42,7 +42,7 @@ public interface NestedPropertyProcessor {
      *
      * @see #acceptEndpoint(String, String)
      */
-    void acceptEndpointRegion(Regions region);
+    void acceptEndpointRegion(Region region);
 
     /**
      * Set the external id, an optional field to designate who can assume an IAM role.
diff --git a/amazon-kinesis-client-multilang/src/main/java/software/amazon/kinesis/multilang/auth/KclSTSAssumeRoleSessionCredentialsProvider.java b/amazon-kinesis-client-multilang/src/main/java/software/amazon/kinesis/multilang/auth/KclSTSAssumeRoleSessionCredentialsProvider.java
index b5b9f924..d0b7b3b9 100644
--- a/amazon-kinesis-client-multilang/src/main/java/software/amazon/kinesis/multilang/auth/KclSTSAssumeRoleSessionCredentialsProvider.java
+++ b/amazon-kinesis-client-multilang/src/main/java/software/amazon/kinesis/multilang/auth/KclSTSAssumeRoleSessionCredentialsProvider.java
@@ -21,11 +21,11 @@ import com.amazonaws.auth.AWSSessionCredentialsProvider;
 import com.amazonaws.auth.STSAssumeRoleSessionCredentialsProvider;
 import com.amazonaws.auth.STSAssumeRoleSessionCredentialsProvider.Builder;
 import com.amazonaws.client.builder.AwsClientBuilder.EndpointConfiguration;
-import com.amazonaws.regions.Regions;
 import com.amazonaws.services.securitytoken.AWSSecurityTokenService;
 import com.amazonaws.services.securitytoken.AWSSecurityTokenServiceClient;
 import software.amazon.kinesis.multilang.NestedPropertyKey;
 import software.amazon.kinesis.multilang.NestedPropertyProcessor;
+import software.amazon.awssdk.regions.Region;
 
 /**
  * An {@link AWSSessionCredentialsProvider} that is backed by STSAssumeRole.
@@ -73,7 +73,7 @@ public class KclSTSAssumeRoleSessionCredentialsProvider
     }
 
     @Override
-    public void acceptEndpointRegion(final Regions region) {
+    public void acceptEndpointRegion(final Region region) {
         final AWSSecurityTokenService stsClient =
                 AWSSecurityTokenServiceClient.builder().withRegion(region).build();
         builder.withStsClient(stsClient);
diff --git a/amazon-kinesis-client-multilang/src/test/java/software/amazon/kinesis/multilang/NestedPropertyKeyTest.java b/amazon-kinesis-client-multilang/src/test/java/software/amazon/kinesis/multilang/NestedPropertyKeyTest.java
index fbffee81..3c2de9c9 100644
--- a/amazon-kinesis-client-multilang/src/test/java/software/amazon/kinesis/multilang/NestedPropertyKeyTest.java
+++ b/amazon-kinesis-client-multilang/src/test/java/software/amazon/kinesis/multilang/NestedPropertyKeyTest.java
@@ -14,11 +14,11 @@
  */
 package software.amazon.kinesis.multilang;
 
-import com.amazonaws.regions.Regions;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.Mock;
 import org.mockito.runners.MockitoJUnitRunner;
+import software.amazon.awssdk.regions.Region;
 
 import static org.junit.Assert.assertEquals;
 import static org.mockito.Mockito.verify;
@@ -64,9 +64,9 @@ public class NestedPropertyKeyTest {
 
     @Test
     public void testEndpointRegion() {
-        final Regions expectedRegion = Regions.GovCloud;
+        final Region expectedRegion = Region.US_GOV_WEST_1;
 
-        parse(mockProcessor, createKey(ENDPOINT_REGION, expectedRegion.getName()));
+        parse(mockProcessor, createKey(ENDPOINT_REGION, expectedRegion.id()));
         verify(mockProcessor).acceptEndpointRegion(expectedRegion);
     }