diff --git a/lib/browser/mqtt.ts b/lib/browser/mqtt.ts
index 946e9efe..6dce4749 100644
--- a/lib/browser/mqtt.ts
+++ b/lib/browser/mqtt.ts
@@ -13,7 +13,6 @@
  */
 
 import * as mqtt from "mqtt";
-import * as mqtt_packet from "mqtt-packet";
 import * as WebsocketUtils from "./ws";
 import * as auth from "./auth";
 import { Trie, TrieOp, Node as TrieNode } from "./trie";
@@ -615,7 +614,7 @@ export class MqttClientConnection extends BufferedEventEmitter {
                 }
                 resolve({
                     packet_id: packet
-                        ? (packet as mqtt_packet.IUnsubackPacket).messageId
+                        ? (packet as mqtt.IUnsubackPacket).messageId
                         : undefined,
                 });
             });
diff --git a/lib/browser/mqtt5.spec.ts b/lib/browser/mqtt5.spec.ts
index c14401b0..1ba3eb9b 100644
--- a/lib/browser/mqtt5.spec.ts
+++ b/lib/browser/mqtt5.spec.ts
@@ -10,7 +10,7 @@ import url from "url";
 import {HttpsProxyAgent} from "https-proxy-agent";
 import * as auth from "./auth";
 
-jest.setTimeout(1000000);
+jest.setTimeout(10000);
 
 function createBrowserSpecificTestConfig (testType: test_utils.SuccessfulConnectionTestType) : mqtt5.Mqtt5ClientConfig {
 
@@ -405,7 +405,7 @@ test_utils.conditional_test(test_utils.ClientEnvironmentalConfig.hasIotCoreEnvir
     await test_utils.testNegotiatedSettings(forcedRejoinClient, true);
 });
 
-test('Sub - Pub QoS 0 - Unsub', async () => {
+test_utils.conditional_test(test_utils.ClientEnvironmentalConfig.hasIotCoreEnvironment())('Sub - Pub QoS 0 - Unsub', async () => {
     let topic : string = `test/${uuid()}`;
     let testPayload : Buffer = Buffer.from("Derp", "utf-8");
 
diff --git a/lib/browser/mqtt5.ts b/lib/browser/mqtt5.ts
index df769173..434e366d 100644
--- a/lib/browser/mqtt5.ts
+++ b/lib/browser/mqtt5.ts
@@ -16,7 +16,6 @@
 
 import {BufferedEventEmitter} from "../common/event";
 import * as mqtt from "mqtt"; /* The mqtt-js external dependency */
-import * as mqtt_packet from "mqtt-packet";
 import * as mqtt5 from "../common/mqtt5";
 import {OutboundTopicAliasBehaviorType} from "../common/mqtt5";
 import * as mqtt5_packet from "../common/mqtt5_packet"
@@ -446,19 +445,15 @@ export class Mqtt5Client extends BufferedEventEmitter implements mqtt5.IMqtt5Cli
                 let subMap: mqtt.ISubscriptionMap = mqtt_utils.transform_crt_subscribe_to_mqtt_js_subscription_map(packet);
                 let subOptions: mqtt.IClientSubscribeOptions = mqtt_utils.transform_crt_subscribe_to_mqtt_js_subscribe_options(packet);
 
-                this.browserClient.subscribe(subMap, subOptions, (error, grants, suback) => {
+                // @ts-ignore
+                this.browserClient.subscribe(subMap, subOptions, (error, grants) => {
                     if (error) {
                         reject(error);
                         return;
                     }
 
-                    if (suback) {
-                        const crtSubackFromMqttjsSuback = mqtt_utils.transform_mqtt_js_suback_to_crt_suback(suback);
-                        resolve(crtSubackFromMqttjsSuback);
-                    } else {
-                        const crtSubackFromGrants: mqtt5_packet.SubackPacket = mqtt_utils.transform_mqtt_js_subscription_grants_to_crt_suback(grants ?? []);
-                        resolve(crtSubackFromGrants);
-                    }
+                    const suback: mqtt5_packet.SubackPacket = mqtt_utils.transform_mqtt_js_subscription_grants_to_crt_suback(grants);
+                    resolve(suback);
                 });
             } catch (err) {
                 reject(err);
@@ -510,7 +505,7 @@ export class Mqtt5Client extends BufferedEventEmitter implements mqtt5.IMqtt5Cli
                         };
                         resolve(unsuback);
                     } else {
-                        const unsuback: mqtt5_packet.UnsubackPacket = mqtt_utils.transform_mqtt_js_unsuback_to_crt_unsuback(packet as mqtt_packet.IUnsubackPacket);
+                        const unsuback: mqtt5_packet.UnsubackPacket = mqtt_utils.transform_mqtt_js_unsuback_to_crt_unsuback(packet as mqtt.IUnsubackPacket);
                         resolve(unsuback);
                     }
                 });
@@ -612,7 +607,7 @@ export class Mqtt5Client extends BufferedEventEmitter implements mqtt5.IMqtt5Cli
                                 })
                             }
 
-                            const puback: mqtt5_packet.PubackPacket = mqtt_utils.transform_mqtt_js_puback_to_crt_puback(completionPacket as mqtt_packet.IPubackPacket);
+                            const puback: mqtt5_packet.PubackPacket = mqtt_utils.transform_mqtt_js_puback_to_crt_puback(completionPacket as mqtt.IPubackPacket);
                             resolve(puback);
                             break;
 
diff --git a/lib/browser/mqtt5_utils.spec.ts b/lib/browser/mqtt5_utils.spec.ts
index 2712caaa..450ed80a 100644
--- a/lib/browser/mqtt5_utils.spec.ts
+++ b/lib/browser/mqtt5_utils.spec.ts
@@ -4,7 +4,6 @@
  */
 
 import * as mqtt from "mqtt";
-import * as mqtt_packet from "mqtt-packet";
 import * as mqtt5 from "./mqtt5";
 import {InboundTopicAliasBehaviorType, OutboundTopicAliasBehaviorType} from "./mqtt5";
 import * as mqtt5_utils from "./mqtt5_utils";
@@ -19,7 +18,7 @@ test('MQTT.JS User Properties to CRT User Properties undefined', async () => {
 });
 
 test('MQTT.JS User Properties to CRT User Properties single', async () => {
-    let mqttJsUserProperties : mqtt_packet.UserProperties = {
+    let mqttJsUserProperties : mqtt.UserProperties = {
         prop1 : "value1",
         prop2 : "value2"
     }
@@ -42,7 +41,7 @@ test('MQTT.JS User Properties to CRT User Properties single', async () => {
 });
 
 test('MQTT.JS User Properties to CRT User Properties multi', async () => {
-    let mqttJsUserProperties : mqtt_packet.UserProperties = {
+    let mqttJsUserProperties : mqtt.UserProperties = {
         prop1 : "value1",
         prop2 : ["value2_1", "value2_2", "value2_3"]
     }
@@ -73,7 +72,7 @@ test('MQTT.JS User Properties to CRT User Properties multi', async () => {
 });
 
 test('CRT User Properties to MQTT.js User Properties undefined', async () => {
-    let mqttJsUserProperties : mqtt_packet.UserProperties | undefined = mqtt5_utils.transform_crt_user_properties_to_mqtt_js_user_properties(undefined);
+    let mqttJsUserProperties : mqtt.UserProperties | undefined = mqtt5_utils.transform_crt_user_properties_to_mqtt_js_user_properties(undefined);
 
     expect(mqttJsUserProperties).toBeUndefined();
 });
@@ -84,7 +83,7 @@ test('CRT User Properties to MQTT.js User Properties single', async () => {
         { name : "prop2", value: "value2"}
     ]
 
-    let mqttJsUserProperties : mqtt_packet.UserProperties | undefined = mqtt5_utils.transform_crt_user_properties_to_mqtt_js_user_properties(crtUserProperties);
+    let mqttJsUserProperties : mqtt.UserProperties | undefined = mqtt5_utils.transform_crt_user_properties_to_mqtt_js_user_properties(crtUserProperties);
 
     expect(mqttJsUserProperties).toEqual(
         {
@@ -101,9 +100,9 @@ test('CRT User Properties to MQTT.js User Properties single', async () => {
         { name : "prop2", value: "value2_3"}
     ]
 
-    let mqttJsUserProperties : mqtt_packet.UserProperties | undefined = mqtt5_utils.transform_crt_user_properties_to_mqtt_js_user_properties(crtUserProperties);
+    let mqttJsUserProperties : mqtt.UserProperties | undefined = mqtt5_utils.transform_crt_user_properties_to_mqtt_js_user_properties(crtUserProperties);
     expect(mqttJsUserProperties).toBeDefined();
-    let definedProperties : mqtt_packet.UserProperties = mqttJsUserProperties ?? {};
+    let definedProperties : mqtt.UserProperties = mqttJsUserProperties ?? {};
 
     const {prop1 : propOne, prop2: propTwo, ...rest} = definedProperties;
 
@@ -707,44 +706,6 @@ test('transform_mqtt_js_subscription_grants_to_crt_suback', async() => {
     });
 });
 
-test('transform_mqtt_js_suback_to_crt_suback - minimal', async() => {
-    let mqttJsSuback : mqtt_packet.ISubackPacket = {
-        cmd: "suback",
-        granted: [1]
-    };
-
-    let suback : mqtt5.SubackPacket = mqtt5_utils.transform_mqtt_js_suback_to_crt_suback(mqttJsSuback);
-
-    expect(suback).toEqual({
-        type: mqtt5.PacketType.Suback,
-        reasonCodes: [mqtt5.SubackReasonCode.GrantedQoS1]
-    });
-});
-
-test('transform_mqtt_js_suback_to_crt_suback - maximal', async() => {
-    let mqttJsSuback : mqtt_packet.ISubackPacket = {
-        cmd: "suback",
-        granted: [2, 128],
-        properties : {
-            reasonString: "Misadventure",
-            userProperties: {
-                world: ["hello"]
-            }
-        }
-    };
-
-    let suback : mqtt5.SubackPacket = mqtt5_utils.transform_mqtt_js_suback_to_crt_suback(mqttJsSuback);
-
-    expect(suback).toEqual({
-        type: mqtt5.PacketType.Suback,
-        reasonCodes: [mqtt5.SubackReasonCode.GrantedQoS2, mqtt5.SubackReasonCode.UnspecifiedError],
-        reasonString: "Misadventure",
-        userProperties: [
-            {name: "world", value: "hello"}
-        ]
-    });
-});
-
 test('transform_crt_publish_to_mqtt_js_publish_options minimal', async() => {
     let publish : mqtt5.PublishPacket = {
         topicName: "hello/there",
@@ -865,7 +826,7 @@ test('transform_mqtt_js_publish_to_crt_publish maximal', async() => {
 });
 
 test('transform_mqtt_js_puback_to_crt_puback minimal', async() => {
-    let mqttJsPuback : mqtt_packet.IPubackPacket = {
+    let mqttJsPuback : mqtt.IPubackPacket = {
         cmd: 'puback'
     };
 
@@ -878,7 +839,7 @@ test('transform_mqtt_js_puback_to_crt_puback minimal', async() => {
 });
 
 test('transform_mqtt_js_puback_to_crt_puback maximal', async() => {
-    let mqttJsPuback : mqtt_packet.IPubackPacket = {
+    let mqttJsPuback : mqtt.IPubackPacket = {
         cmd: 'puback',
         reasonCode: mqtt5.PubackReasonCode.NotAuthorized,
         properties: {
@@ -931,9 +892,9 @@ test('transform_crt_unsubscribe_to_mqtt_js_unsubscribe_options maximal', async()
 });
 
 test('transform_mqtt_js_unsuback_to_crt_unsuback minimal', async() => {
-    let mqttJsUnsuback : mqtt_packet.IUnsubackPacket = {
+    let mqttJsUnsuback : mqtt.IUnsubackPacket = {
         cmd: 'unsuback',
-        granted: [mqtt5.UnsubackReasonCode.NoSubscriptionExisted]
+        reasonCode: mqtt5.UnsubackReasonCode.NoSubscriptionExisted
     };
 
     let crtUnsuback : mqtt5.UnsubackPacket = mqtt5_utils.transform_mqtt_js_unsuback_to_crt_unsuback(mqttJsUnsuback);
@@ -945,9 +906,10 @@ test('transform_mqtt_js_unsuback_to_crt_unsuback minimal', async() => {
 });
 
 test('transform_mqtt_js_unsuback_to_crt_unsuback maximal', async() => {
-    let mqttJsUnsuback : mqtt_packet.IUnsubackPacket = {
+    let mqttJsUnsuback : mqtt.IUnsubackPacket = {
         cmd: 'unsuback',
-        granted: [mqtt5.UnsubackReasonCode.NoSubscriptionExisted, mqtt5.UnsubackReasonCode.ImplementationSpecificError],
+        // @ts-ignore
+        reasonCode: [mqtt5.UnsubackReasonCode.NoSubscriptionExisted, mqtt5.UnsubackReasonCode.ImplementationSpecificError],
         properties: {
             reasonString: "Dunno",
             userProperties: {
diff --git a/lib/browser/mqtt5_utils.ts b/lib/browser/mqtt5_utils.ts
index 066a8f93..ab85d232 100644
--- a/lib/browser/mqtt5_utils.ts
+++ b/lib/browser/mqtt5_utils.ts
@@ -5,7 +5,6 @@
  */
 
 import * as mqtt from "mqtt";
-import * as mqtt_packet from "mqtt-packet";
 import * as mqtt_shared from "../common/mqtt_shared";
 import * as mqtt5 from "./mqtt5";
 import * as utils from "../common/utils";
@@ -252,7 +251,7 @@ export function create_mqtt_js_client_config_from_crt_client_config(crtConfig :
 }
 
 /** @internal */
-export function transform_crt_user_properties_to_mqtt_js_user_properties(userProperties?: mqtt5.UserProperty[]) : mqtt_packet.UserProperties | undefined {
+export function transform_crt_user_properties_to_mqtt_js_user_properties(userProperties?: mqtt5.UserProperty[]) : mqtt.UserProperties | undefined {
     if (!userProperties) {
         return undefined;
     }
@@ -275,7 +274,7 @@ export function transform_crt_user_properties_to_mqtt_js_user_properties(userPro
 }
 
 /** @internal */
-export function transform_mqtt_js_user_properties_to_crt_user_properties(userProperties?: mqtt_packet.UserProperties) : mqtt5.UserProperty[] | undefined {
+export function transform_mqtt_js_user_properties_to_crt_user_properties(userProperties?: mqtt.UserProperties) : mqtt5.UserProperty[] | undefined {
     if (!userProperties) {
         return undefined;
     }
@@ -403,7 +402,7 @@ export function transform_crt_subscribe_to_mqtt_js_subscribe_options(subscribe:
 }
 
 /** @internal **/
-export function transform_mqtt_js_suback_to_crt_suback(mqttJsSuback: mqtt_packet.ISubackPacket) : mqtt5.SubackPacket {
+export function transform_mqtt_js_suback_to_crt_suback(mqttJsSuback: mqtt.ISubackPacket) : mqtt5.SubackPacket {
     if (!mqttJsSuback) {
         throw new CrtError("transform_mqtt_js_suback_to_crt_suback: mqttJsSuback not defined");
     }
@@ -521,7 +520,7 @@ export function transform_mqtt_js_publish_to_crt_publish(publish: mqtt.IPublishP
 }
 
 /** @internal **/
-export function transform_mqtt_js_puback_to_crt_puback(puback: mqtt_packet.IPubackPacket) : mqtt5.PubackPacket {
+export function transform_mqtt_js_puback_to_crt_puback(puback: mqtt.IPubackPacket) : mqtt5.PubackPacket {
 
     if (puback == null || puback == undefined) {
         throw new CrtError("transform_mqtt_js_puback_to_crt_puback: puback not defined");
@@ -562,15 +561,25 @@ export function transform_crt_unsubscribe_to_mqtt_js_unsubscribe_options(unsubsc
 }
 
 /** @internal **/
-export function transform_mqtt_js_unsuback_to_crt_unsuback(packet: mqtt_packet.IUnsubackPacket) : mqtt5.UnsubackPacket {
+export function transform_mqtt_js_unsuback_to_crt_unsuback(packet: mqtt.IUnsubackPacket) : mqtt5.UnsubackPacket {
 
     if (packet == null || packet == undefined) {
         throw new CrtError("transform_mqtt_js_unsuback_to_crt_unsuback: packet not defined");
     }
 
+    let reasonCodes : number | number[] | undefined = packet.reasonCode;
+    let codes : number[];
+    if (Array.isArray(reasonCodes)) {
+        codes = reasonCodes;
+    } else if (typeof reasonCodes == 'number') {
+        codes = [reasonCodes];
+    } else {
+        codes = [];
+    }
+
     let crtUnsuback : mqtt5.UnsubackPacket = {
         type: mqtt5.PacketType.Unsuback,
-        reasonCodes : packet.granted
+        reasonCodes : codes
     }
 
     if (packet.properties) {
diff --git a/package-lock.json b/package-lock.json
index 22d9858d..f1aa1939 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -406,14 +406,6 @@
         "@babel/helper-plugin-utils": "^7.24.8"
       }
     },
-    "@babel/runtime": {
-      "version": "7.25.0",
-      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.25.0.tgz",
-      "integrity": "sha512-7dRy4DwXwtzBrPbZflqxnvfxLF8kdZXPkhymtDeFoFqE6ldzjQFgYTtYIFARcLEYDrqfBfYcZt1WqFxRoyC9Rw==",
-      "requires": {
-        "regenerator-runtime": "^0.14.0"
-      }
-    },
     "@babel/template": {
       "version": "7.25.0",
       "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.25.0.tgz",
@@ -892,7 +884,8 @@
     "@types/node": {
       "version": "14.18.63",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-14.18.63.tgz",
-      "integrity": "sha512-fAtCfv4jJg+ExtXhvCkCqUKZ+4ok/JQk01qDKhL5BDDoS3AxKXhV5/MAVUZyQnSEd2GT92fkgZl0pz0Q0AzcIQ=="
+      "integrity": "sha512-fAtCfv4jJg+ExtXhvCkCqUKZ+4ok/JQk01qDKhL5BDDoS3AxKXhV5/MAVUZyQnSEd2GT92fkgZl0pz0Q0AzcIQ==",
+      "dev": true
     },
     "@types/prettier": {
       "version": "2.6.0",
@@ -909,22 +902,6 @@
         "@types/node": "*"
       }
     },
-    "@types/readable-stream": {
-      "version": "4.0.15",
-      "resolved": "https://registry.npmjs.org/@types/readable-stream/-/readable-stream-4.0.15.tgz",
-      "integrity": "sha512-oAZ3kw+kJFkEqyh7xORZOku1YAKvsFTogRY8kVl4vHpEKiDkfnSA/My8haRE7fvmix5Zyy+1pwzOi7yycGLBJw==",
-      "requires": {
-        "@types/node": "*",
-        "safe-buffer": "~5.1.1"
-      },
-      "dependencies": {
-        "safe-buffer": {
-          "version": "5.1.2",
-          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
-          "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
-        }
-      }
-    },
     "@types/stack-utils": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/@types/stack-utils/-/stack-utils-2.0.3.tgz",
@@ -977,14 +954,6 @@
       "integrity": "sha512-j2afSsaIENvHZN2B8GOpF566vZ5WVk5opAiMTvWgaQT8DkbOqsTfvNAvHoRGU2zzP8cPoqys+xHTRDWW8L+/BA==",
       "dev": true
     },
-    "abort-controller": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/abort-controller/-/abort-controller-3.0.0.tgz",
-      "integrity": "sha512-h8lQ8tacZYnR3vNQTgibj+tODHI5/+l06Au2Pcriv/Gmet0eaj4TwWH41sO9wnHDiQsEj19q0drzdWdeAHtweg==",
-      "requires": {
-        "event-target-shim": "^5.0.0"
-      }
-    },
     "acorn": {
       "version": "8.12.1",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.12.1.tgz",
@@ -1252,8 +1221,7 @@
     "balanced-match": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
-      "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==",
-      "dev": true
+      "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw=="
     },
     "base64-js": {
       "version": "1.5.1",
@@ -1264,7 +1232,6 @@
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/bl/-/bl-4.1.0.tgz",
       "integrity": "sha512-1W07cM9gS6DcLperZfFSj+bWLtaPGSOHWhPiGzXmvVJbRLdG82sH/Kn8EtW1VqWVA54AKf2h5k5BbnIbwF3h6w==",
-      "dev": true,
       "requires": {
         "buffer": "^5.5.0",
         "inherits": "^2.0.4",
@@ -1275,7 +1242,6 @@
           "version": "5.7.1",
           "resolved": "https://registry.npmjs.org/buffer/-/buffer-5.7.1.tgz",
           "integrity": "sha512-EHcyIPBQ4BSGlvjB16k5KgAJ27CIsHY/2JBmCRReo48y9rQ3MaUzWX3KVlBa4U7MyX02HdVj0K7C3WaB3ju7FQ==",
-          "dev": true,
           "requires": {
             "base64-js": "^1.3.1",
             "ieee754": "^1.1.13"
@@ -1285,7 +1251,6 @@
           "version": "3.6.2",
           "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.2.tgz",
           "integrity": "sha512-9u/sniCrY3D5WdsERHzHE4G2YCXqoG5FTHUiCC4SIbr6XcLZBY05ya9EKjYek9O5xOAwjGq+1JdGBAS7Q9ScoA==",
-          "dev": true,
           "requires": {
             "inherits": "^2.0.3",
             "string_decoder": "^1.1.1",
@@ -1298,7 +1263,6 @@
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
       "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
-      "dev": true,
       "requires": {
         "balanced-match": "^1.0.0",
         "concat-map": "0.0.1"
@@ -1527,15 +1491,25 @@
       "dev": true
     },
     "commist": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/commist/-/commist-3.2.0.tgz",
-      "integrity": "sha512-4PIMoPniho+LqXmpS5d3NuGYncG6XWlkBSVGiWycL22dd42OYdUGil2CWuzklaJoNxyxUSpO4MKIBU94viWNAw=="
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/commist/-/commist-1.1.0.tgz",
+      "integrity": "sha512-rraC8NXWOEjhADbZe9QBNzLAN5Q3fsTPQtBV+fEVj6xKIgDgNiEVE6ZNfHpZOqfQ21YUzfVNUXLOEZquYvQPPg==",
+      "requires": {
+        "leven": "^2.1.0",
+        "minimist": "^1.1.0"
+      },
+      "dependencies": {
+        "leven": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/leven/-/leven-2.1.0.tgz",
+          "integrity": "sha512-nvVPLpIHUxCUoRLrFqTgSxXJ614d8AgQoWl7zPe/2VadE8+1dpU3LBhowRuBAcuwruWtOdD8oYC9jDNJjXDPyA=="
+        }
+      }
     },
     "concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
-      "integrity": "sha512-/Srv4dswyQNBfohGpz9o6Yb3Gz3SrUDqBH5rTuhGR7ahtlbYKnVxw2bCFMRljaA7EXHaXZ8wsHdodFvbkhKmqg==",
-      "dev": true
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+    "string_decoder": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+      "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+      "requires": {
+        "safe-buffer": "~5.1.0"
+      },
+      "dependencies": {
+        "safe-buffer": {
+          "version": "5.1.2",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+          "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
+        }
+      }
+    },
     "strip-ansi": {
       "version": "6.0.1",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
@@ -4604,8 +4539,7 @@
       "version": "5.1.0",
       "resolved": "https://registry.npmjs.org/typedoc-plugin-merge-modules/-/typedoc-plugin-merge-modules-5.1.0.tgz",
       "integrity": "sha512-jXH27L/wlxFjErgBXleh3opVgjVTXFEuBo68Yfl18S9Oh/IqxK6NV94jlEJ9hl4TXc9Zm2l7Rfk41CEkcCyvFQ==",
-      "dev": true,
-      "requires": {}
+      "dev": true
     },
     "typescript": {
       "version": "4.9.5",
@@ -4920,37 +4854,6 @@
         "string-width": "^1.0.2 || 2 || 3 || 4"
       }
     },
-    "worker-timers": {
-      "version": "7.1.8",
-      "resolved": "https://registry.npmjs.org/worker-timers/-/worker-timers-7.1.8.tgz",
-      "integrity": "sha512-R54psRKYVLuzff7c1OTFcq/4Hue5Vlz4bFtNEIarpSiCYhpifHU3aIQI29S84o1j87ePCYqbmEJPqwBTf+3sfw==",
-      "requires": {
-        "@babel/runtime": "^7.24.5",
-        "tslib": "^2.6.2",
-        "worker-timers-broker": "^6.1.8",
-        "worker-timers-worker": "^7.0.71"
-      }
-    },
-    "worker-timers-broker": {
-      "version": "6.1.8",
-      "resolved": "https://registry.npmjs.org/worker-timers-broker/-/worker-timers-broker-6.1.8.tgz",
-      "integrity": "sha512-FUCJu9jlK3A8WqLTKXM9E6kAmI/dR1vAJ8dHYLMisLNB/n3GuaFIjJ7pn16ZcD1zCOf7P6H62lWIEBi+yz/zQQ==",
-      "requires": {
-        "@babel/runtime": "^7.24.5",
-        "fast-unique-numbers": "^8.0.13",
-        "tslib": "^2.6.2",
-        "worker-timers-worker": "^7.0.71"
-      }
-    },
-    "worker-timers-worker": {
-      "version": "7.0.71",
-      "resolved": "https://registry.npmjs.org/worker-timers-worker/-/worker-timers-worker-7.0.71.tgz",
-      "integrity": "sha512-ks/5YKwZsto1c2vmljroppOKCivB/ma97g9y77MAAz2TBBjPPgpoOiS1qYQKIgvGTr2QYPT3XhJWIB6Rj2MVPQ==",
-      "requires": {
-        "@babel/runtime": "^7.24.5",
-        "tslib": "^2.6.2"
-      }
-    },
     "wrap-ansi": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
@@ -4982,8 +4885,7 @@
     "ws": {
       "version": "8.18.0",
       "resolved": "https://registry.npmjs.org/ws/-/ws-8.18.0.tgz",
-      "integrity": "sha512-8VbfWfHLbbwu3+N6OKsOMpBdT4kXPDDB9cJk2bJ6mh9ucxdlnNvH1e+roYkKmN9Nxw2yjz7VzeO9oOz2zJ04Pw==",
-      "requires": {}
+      "integrity": "sha512-8VbfWfHLbbwu3+N6OKsOMpBdT4kXPDDB9cJk2bJ6mh9ucxdlnNvH1e+roYkKmN9Nxw2yjz7VzeO9oOz2zJ04Pw=="
     },
     "xml-name-validator": {
       "version": "3.0.0",
@@ -5027,8 +4929,7 @@
     "yallist": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
-      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
-      "dev": true
+      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A=="
     },
     "yargs": {
       "version": "17.7.2",
diff --git a/package.json b/package.json
index d7c4e666..9e039119 100644
--- a/package.json
+++ b/package.json
@@ -54,7 +54,7 @@
     "axios": "^1.7.4",
     "buffer": "^6.0.3",
     "crypto-js": "^4.2.0",
-    "mqtt": "^5.9.1",
+    "mqtt": "^4.3.8",
     "process": "^0.11.10"
   }
 }
diff --git a/test/mqtt5.ts b/test/mqtt5.ts
index e49332bb..3109c112 100644
--- a/test/mqtt5.ts
+++ b/test/mqtt5.ts
@@ -379,14 +379,12 @@ export async function subPubUnsubTest(client: mqtt5.Mqtt5Client, qos: mqtt5.QoS,
 
     await connectionSuccess;
 
-    const suback = await client.subscribe({
+    await client.subscribe({
         subscriptions: [
             { qos : mqtt5.QoS.AtLeastOnce, topicFilter: topic }
         ]
     });
 
-    expect(suback.reasonCodes).toEqual([mqtt5.QoS.AtLeastOnce])
-
     await client.publish({
         topicName: topic,
         qos: qos,
@@ -395,12 +393,10 @@ export async function subPubUnsubTest(client: mqtt5.Mqtt5Client, qos: mqtt5.QoS,
 
     await messageReceived;
 
-    const unsuback = await client.unsubscribe({
+    await client.unsubscribe({
         topicFilters: [ topic ]
     });
 
-    expect(unsuback.reasonCodes).toEqual([mqtt5.UnsubackReasonCode.Success])
-
     await client.publish({
         topicName: topic,
         qos: mqtt5.QoS.AtLeastOnce,