diff --git a/cli/README-CN.md b/cli/README-CN.md
index 5fa9240a6..e74eb6b60 100644
--- a/cli/README-CN.md
+++ b/cli/README-CN.md
@@ -180,7 +180,7 @@ mqttx conn --help
 
 | 参数                                             | 描述                                                                                       |
 | ------------------------------------------------ | ------------------------------------------------------------------------------------------ |
-| -V, --mqtt-version <5/3.1.1/3.1>                 | MQTT 版本，默认为 5                                                                        |
+| -V, --mqtt-version <5.0/3.1.1/3.1>                 | MQTT 版本，默认为 5                                                                        |
 | -h, --hostname <HOST>                            | MQTT Broker 的 Host 地址，默认为 localhost                                                 |
 | -p, --port <PORT>                                | MQTT Broker 的端口号                                                                       |
 | -i, --client-id <ID>                             | 客户端 ID                                                                                  |
@@ -226,7 +226,7 @@ mqttx sub --help
 
 | 参数                                             | 描述                                                                                       |
 | ------------------------------------------------ | ------------------------------------------------------------------------------------------ |
-| -V, --mqtt-version <5/3.1.1/3.1>                 | MQTT 版本，默认为 5                                                                        |
+| -V, --mqtt-version <5.0/3.1.1/3.1>                 | MQTT 版本，默认为 5                                                                        |
 | -h, --hostname <HOST>                            | MQTT Broker 的 Host 地址，默认为 localhost                                                 |
 | -p, --port <PORT>                                | MQTT Broker 的端口号                                                                       |
 | -i, --client-id <ID>                             | 客户端 ID                                                                                  |
@@ -284,7 +284,7 @@ mqttx pub --help
 
 | 参数                                             | 描述                                                                                       |
 | ------------------------------------------------ | ------------------------------------------------------------------------------------------ |
-| -V, --mqtt-version <5/3.1.1/3.1>                 | MQTT 版本，默认为 5                                                                        |
+| -V, --mqtt-version <5.0/3.1.1/3.1>                 | MQTT 版本，默认为 5                                                                        |
 | -h, --hostname <HOST>                            | MQTT Broker 的 Host 地址，默认为 localhost                                                 |
 | -p, --port <PORT>                                | MQTT Broker 的端口号                                                                       |
 | -i, --client-id <ID>                             | 客户端 ID                                                                                  |
diff --git a/cli/src/index.ts b/cli/src/index.ts
index 789941abb..0b1c55e39 100755
--- a/cli/src/index.ts
+++ b/cli/src/index.ts
@@ -56,7 +56,7 @@ export class Commander {
     this.program
       .command('conn')
       .description('Create a connection and connect to MQTT Broker.')
-      .option('-V, --mqtt-version <5/3.1.1/3.1>', 'the MQTT version', parseMQTTVersion, 5)
+      .option('-V, --mqtt-version <5.0/3.1.1/3.1>', 'the MQTT version', parseMQTTVersion, 5)
       .option('-h, --hostname <HOST>', 'the broker host', state.getConfig('host'))
       .option('-p, --port <PORT>', 'the broker port', parseNumber, state.getConfig('port'))
       .option('-i, --client-id <ID>', 'the client id', getClientId())
@@ -161,7 +161,7 @@ export class Commander {
       .option('-si, --subscription-identifier <NUMBER>', 'the identifier of the subscription', parseNumber)
       .option('-ct, --content-type <TYPE>', 'a description of the content of the publish message')
       // connect options
-      .option('-V, --mqtt-version <5/3.1.1/3.1>', 'the MQTT version', parseMQTTVersion, 5)
+      .option('-V, --mqtt-version <5.0/3.1.1/3.1>', 'the MQTT version', parseMQTTVersion, 5)
       .option('-h, --hostname <HOST>', 'the broker host', state.getConfig('host'))
       .option('-p, --port <PORT>', 'the broker port', parseNumber, state.getConfig('port'))
       .option(
@@ -282,7 +282,7 @@ export class Commander {
         'default',
       )
       // connect options
-      .option('-V, --mqtt-version <5/3.1.1/3.1>', 'the MQTT version', parseMQTTVersion, 5)
+      .option('-V, --mqtt-version <5.0/3.1.1/3.1>', 'the MQTT version', parseMQTTVersion, 5)
       .option('-h, --hostname <HOST>', 'the broker host', state.getConfig('host'))
       .option('-p, --port <PORT>', 'the broker port', parseNumber, state.getConfig('port'))
       .option('-i, --client-id <ID>', 'the client id', getClientId())
@@ -388,7 +388,7 @@ export class Commander {
       .description('Create a custom number of connections.')
       .option('-c, --count <NUMBER>', 'the number of connections', parseNumber, 1000)
       .option('-i, --interval <MILLISECONDS>', 'interval of connecting to the broker', parseNumber, 10)
-      .option('-V, --mqtt-version <5/3.1.1/3.1>', 'the MQTT version', parseMQTTVersion, 5)
+      .option('-V, --mqtt-version <5.0/3.1.1/3.1>', 'the MQTT version', parseMQTTVersion, 5)
       .option('-h, --hostname <HOST>', 'the broker host', state.getConfig('host'))
       .option('-p, --port <PORT>', 'the broker port', parseNumber, state.getConfig('port'))
       .option('-I, --client-id <ID>', 'the client id, support %i (index) variable', getClientId())
@@ -504,7 +504,7 @@ export class Commander {
       .option('-ct, --content-type <TYPE>', 'a description of the content of the publish message')
       .option('-v, --verbose', 'print history published total and message rate')
       // connect options
-      .option('-V, --mqtt-version <5/3.1.1/3.1>', 'the MQTT version', parseMQTTVersion, 5)
+      .option('-V, --mqtt-version <5.0/3.1.1/3.1>', 'the MQTT version', parseMQTTVersion, 5)
       .option('-h, --hostname <HOST>', 'the broker host', state.getConfig('host'))
       .option('-p, --port <PORT>', 'the broker port', parseNumber, state.getConfig('port'))
       .option('-I, --client-id <ID>', 'the client id, support %i (index) variable', getClientId())
@@ -608,7 +608,7 @@ export class Commander {
       )
       .option('-v, --verbose', 'print history received messages and rate')
       // connect options
-      .option('-V, --mqtt-version <5/3.1.1/3.1>', 'the MQTT version', parseMQTTVersion, 5)
+      .option('-V, --mqtt-version <5.0/3.1.1/3.1>', 'the MQTT version', parseMQTTVersion, 5)
       .option('-h, --hostname <HOST>', 'the broker host', state.getConfig('host'))
       .option('-p, --port <PORT>', 'the broker port', parseNumber, state.getConfig('port'))
       .option('-I, --client-id <ID>', 'the client id, support %i (index) variable', getClientId())
@@ -726,7 +726,7 @@ export class Commander {
       .option('-ct, --content-type <TYPE>', 'a description of the content of the publish message')
       .option('-v, --verbose', 'print history published total and message rate')
       // connect options
-      .option('-V, --mqtt-version <5/3.1.1/3.1>', 'the MQTT version', parseMQTTVersion, 5)
+      .option('-V, --mqtt-version <5.0/3.1.1/3.1>', 'the MQTT version', parseMQTTVersion, 5)
       .option('-h, --hostname <HOST>', 'the broker host', state.getConfig('host'))
       .option('-p, --port <PORT>', 'the broker port', parseNumber, state.getConfig('port'))
       .option('-I, --client-id <ID>', 'the client id, support %i (index) variable', getClientId())
diff --git a/cli/src/utils/parse.ts b/cli/src/utils/parse.ts
index f37fefd9d..db635de7b 100644
--- a/cli/src/utils/parse.ts
+++ b/cli/src/utils/parse.ts
@@ -26,16 +26,18 @@ const parseProtocol = (value: string) => {
 }
 
 const parseMQTTVersion = (value: string) => {
-  const dict = {
+  const dict: Record<string, number> = {
     '3.1': 3,
     '3.1.1': 4,
     '5': 5,
   }
-  if (!Object.keys(dict).includes(value)) {
+  // Normalize '5.0' to '5'
+  const normalizedValue = value === '5.0' ? '5' : value
+  if (!dict[normalizedValue]) {
     logWrapper.fail('Not a valid MQTT version.')
     process.exit(1)
   }
-  return dict[value as '3.1' | '3.1.1' | '5']
+  return dict[normalizedValue as '3.1' | '3.1.1' | '5']
 }
 
 const parseKeyValues = (value: string, previous?: Record<string, string | string[]>) => {