diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
index f123135e4..cd26f00d1 100644
--- a/.github/workflows/benchmark.yml
+++ b/.github/workflows/benchmark.yml
@@ -21,7 +21,7 @@ jobs:
         run: ./run-benchmarks.sh
         working-directory: ./benchmark
       - name: Upload Results
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Benchmark Results
           path: ./benchmark/jmh-result.json
diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index 4210ff2f9..9cae77047 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -37,13 +37,13 @@ jobs:
         shell: cmd
         if: matrix.os == 'windows-latest'
       - name: Upload Failed Test Report
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         if: failure()
         with:
           name: Failed Test Report
           path: target/surefire-reports
       - name: Upload Coverage
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         if: matrix.os == 'ubuntu-latest'
         with:
           name: Coverage Report ${{ matrix.os }}
diff --git a/src/main/java/com/aws/greengrass/clientdevices/auth/certificate/infra/BackgroundCertificateRefresh.java b/src/main/java/com/aws/greengrass/clientdevices/auth/certificate/infra/BackgroundCertificateRefresh.java
index 3bdc90045..4bd2aa758 100644
--- a/src/main/java/com/aws/greengrass/clientdevices/auth/certificate/infra/BackgroundCertificateRefresh.java
+++ b/src/main/java/com/aws/greengrass/clientdevices/auth/certificate/infra/BackgroundCertificateRefresh.java
@@ -202,12 +202,12 @@ private Optional<Set<String>> getThingsAssociatedWithCoreDevice() {
                         .build();
 
         try {
-            Stream<List<AssociatedClientDevice>> cloudAssociatedDevices =
+            List<AssociatedClientDevice> cloudAssociatedDevices =
                     RetryUtils.runWithRetry(retryConfig, iotAuthClient::getThingsAssociatedWithCoreDevice,
                             "get-things-associated-with-core-device", logger);
 
             Set<String> cloudThings =
-                    cloudAssociatedDevices.flatMap(List::stream).map(AssociatedClientDevice::thingName)
+                    cloudAssociatedDevices.stream().map(AssociatedClientDevice::thingName)
                             .collect(Collectors.toSet());
 
             return Optional.of(cloudThings);
diff --git a/src/main/java/com/aws/greengrass/clientdevices/auth/iot/IotAuthClient.java b/src/main/java/com/aws/greengrass/clientdevices/auth/iot/IotAuthClient.java
index a4c6ddf27..c3d4adca6 100644
--- a/src/main/java/com/aws/greengrass/clientdevices/auth/iot/IotAuthClient.java
+++ b/src/main/java/com/aws/greengrass/clientdevices/auth/iot/IotAuthClient.java
@@ -24,7 +24,6 @@
 import software.amazon.awssdk.services.greengrassv2.GreengrassV2ClientBuilder;
 import software.amazon.awssdk.services.greengrassv2.model.AssociatedClientDevice;
 import software.amazon.awssdk.services.greengrassv2.model.ListClientDevicesAssociatedWithCoreDeviceRequest;
-import software.amazon.awssdk.services.greengrassv2.model.ListClientDevicesAssociatedWithCoreDeviceResponse;
 import software.amazon.awssdk.services.greengrassv2.paginators.ListClientDevicesAssociatedWithCoreDeviceIterable;
 import software.amazon.awssdk.services.greengrassv2data.GreengrassV2DataClient;
 import software.amazon.awssdk.services.greengrassv2data.model.ResourceNotFoundException;
@@ -37,7 +36,7 @@
 import java.util.List;
 import java.util.Objects;
 import java.util.Optional;
-import java.util.stream.Stream;
+import java.util.stream.Collectors;
 import javax.inject.Inject;
 
 public interface IotAuthClient {
@@ -50,7 +49,7 @@ public interface IotAuthClient {
     boolean isThingAttachedToCertificate(Thing thing, String certificateId) throws CloudServiceInteractionException;
 
 
-    Stream<List<AssociatedClientDevice>> getThingsAssociatedWithCoreDevice();
+    List<AssociatedClientDevice> getThingsAssociatedWithCoreDevice();
 
     class Default implements IotAuthClient {
         private static final Logger logger = LogManager.getLogger(Default.class);
@@ -184,7 +183,7 @@ public boolean isThingAttachedToCertificate(Thing thing, String certificateId)
         }
 
         @Override
-        public Stream<List<AssociatedClientDevice>> getThingsAssociatedWithCoreDevice() {
+        public List<AssociatedClientDevice> getThingsAssociatedWithCoreDevice() {
             String thingName = Coerce.toString(deviceConfiguration.getThingName());
 
             ListClientDevicesAssociatedWithCoreDeviceRequest request =
@@ -194,8 +193,8 @@ public Stream<List<AssociatedClientDevice>> getThingsAssociatedWithCoreDevice()
                 ListClientDevicesAssociatedWithCoreDeviceIterable responses =
                         client.listClientDevicesAssociatedWithCoreDevicePaginator(request);
 
-                return responses.stream()
-                        .map(ListClientDevicesAssociatedWithCoreDeviceResponse::associatedClientDevices);
+                return responses.stream().flatMap(response -> response.associatedClientDevices().stream())
+                        .collect(Collectors.toList());
             }
         }
 
@@ -203,11 +202,10 @@ public Stream<List<AssociatedClientDevice>> getThingsAssociatedWithCoreDevice()
         //  are adding it here to avoid introducing new changes to the nucleus
         private GreengrassV2Client getGGV2Client() {
             String awsRegion = Coerce.toString(deviceConfiguration.getAWSRegion());
-            GreengrassV2ClientBuilder clientBuilder =
-                    GreengrassV2Client.builder().httpClientBuilder(ProxyUtils.getSdkHttpClientBuilder()
-                                    .useIdleConnectionReaper(false))
-                            .credentialsProvider(lazyCredentialProvider).overrideConfiguration(
-                                    ClientOverrideConfiguration.builder().retryPolicy(RetryMode.STANDARD).build());
+            GreengrassV2ClientBuilder clientBuilder = GreengrassV2Client.builder()
+                    .httpClientBuilder(ProxyUtils.getSdkHttpClientBuilder().useIdleConnectionReaper(false))
+                    .credentialsProvider(lazyCredentialProvider).overrideConfiguration(
+                            ClientOverrideConfiguration.builder().retryPolicy(RetryMode.STANDARD).build());
 
             if (Utils.isEmpty(awsRegion)) {
                 return clientBuilder.build();
diff --git a/src/test/java/com/aws/greengrass/clientdevices/auth/iot/IotAuthClientFake.java b/src/test/java/com/aws/greengrass/clientdevices/auth/iot/IotAuthClientFake.java
index 5032e5d8d..069230999 100644
--- a/src/test/java/com/aws/greengrass/clientdevices/auth/iot/IotAuthClientFake.java
+++ b/src/test/java/com/aws/greengrass/clientdevices/auth/iot/IotAuthClientFake.java
@@ -12,6 +12,7 @@
 
 import java.time.Instant;
 import java.util.ArrayList;
+import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
@@ -22,7 +23,7 @@
 import java.util.Optional;
 import java.util.Set;
 import java.util.function.Supplier;
-import java.util.stream.Stream;
+import java.util.stream.Collectors;
 
 /**
  * IoT Auth Client Fake allows test writers to set up valid and invalid certificates, as well as Thing <-> certificate
@@ -126,11 +127,11 @@ public void detachThingFromCore(Supplier<String> thingName) {
     }
 
     @Override
-    public Stream<List<AssociatedClientDevice>> getThingsAssociatedWithCoreDevice() {
+    public List<AssociatedClientDevice> getThingsAssociatedWithCoreDevice() {
         ThingsAttachedToCorePaginator paginator = new ThingsAttachedToCorePaginator(
                 new ListClientDevicesAssociatedWithCoreDeviceResponseFetcher(this.thingsAttachedToCore));
 
-        return paginator.stream();
+        return paginator.stream().flatMap(Collection::stream).collect(Collectors.toList());
     }
 
     /**