diff --git a/src/routes/user/system/SystemRouter.ts b/src/routes/user/system/SystemRouter.ts
index bdb82d4..2f813ee 100644
--- a/src/routes/user/system/SystemRouter.ts
+++ b/src/routes/user/system/SystemRouter.ts
@@ -11,6 +11,7 @@ import Utils from '../../../utils/Utils'
 import * as path from 'path'
 import DockerUtils from '../../../docker/DockerUtils'
 import DockerApi from '../../../docker/DockerApi'
+import VersionManager from '../../../user/system/VersionManager'
 
 const router = express.Router()
 
@@ -166,7 +167,7 @@ router.get('/loadbalancerinfo/', function(req, res, next) {
 router.get('/versionInfo/', function(req, res, next) {
     return Promise.resolve()
         .then(function() {
-            return CaptainManager.get().getCaptainImageTags()
+            return VersionManager.get().getCaptainImageTags()
         })
         .then(function(data) {
             let baseApi = new BaseApi(
@@ -184,7 +185,7 @@ router.post('/versionInfo/', function(req, res, next) {
 
     return Promise.resolve()
         .then(function() {
-            return CaptainManager.get().updateCaptain(latestVersion)
+            return VersionManager.get().updateCaptain(latestVersion)
         })
         .then(function() {
             let baseApi = new BaseApi(
diff --git a/src/user/system/CaptainManager.ts b/src/user/system/CaptainManager.ts
index 2e709d3..b78f89e 100644
--- a/src/user/system/CaptainManager.ts
+++ b/src/user/system/CaptainManager.ts
@@ -497,108 +497,6 @@ class CaptainManager {
             })
     }
 
-    getCaptainImageTags() {
-        const url =
-            'https://hub.docker.com/v2/repositories/' +
-            CaptainConstants.configs.publishedNameOnDockerHub +
-            '/tags'
-
-        return new Promise<string[]>(function(resolve, reject) {
-            request(
-                url,
-
-                function(error, response, body) {
-                    if (CaptainConstants.isDebug) {
-                        resolve(['v0.0.1'])
-                        return
-                    }
-
-                    if (error) {
-                        reject(error)
-                    } else if (!body || !JSON.parse(body).results) {
-                        reject(
-                            new Error(
-                                'Received empty body or no result for version list on docker hub.'
-                            )
-                        )
-                    } else {
-                        const results = JSON.parse(body).results
-                        const tags = []
-                        for (let idx = 0; idx < results.length; idx++) {
-                            tags.push(results[idx].name)
-                        }
-                        resolve(tags)
-                    }
-                }
-            )
-        })
-        .then(function(tagList) {
-            let currentVersion = CaptainConstants.configs.version.split('.')
-            let latestVersion = CaptainConstants.configs.version.split('.')
-
-            let canUpdate = false
-
-            for (let i = 0; i < tagList.length; i++) {
-                let tag = tagList[i].split('.')
-
-                if (tag.length !== 3) {
-                    continue
-                }
-
-                if (Number(tag[0]) > Number(currentVersion[0])) {
-                    canUpdate = true
-                    latestVersion = tag
-                    break
-                } else if (
-                    Number(tag[0]) === Number(currentVersion[0]) &&
-                    Number(tag[1]) > Number(currentVersion[1])
-                ) {
-                    canUpdate = true
-                    latestVersion = tag
-                    break
-                } else if (
-                    Number(tag[0]) === Number(currentVersion[0]) &&
-                    Number(tag[1]) === Number(currentVersion[1]) &&
-                    Number(tag[2]) > Number(currentVersion[2])
-                ) {
-                    canUpdate = true
-                    latestVersion = tag
-                    break
-                }
-            }
-
-            return {
-                currentVersion: currentVersion.join('.'),
-                latestVersion: latestVersion.join('.'),
-                canUpdate: canUpdate,
-            }
-        })
-    }
-
-    updateCaptain(versionTag: string) {
-        const self = this
-        return Promise.resolve().then(function() {
-            return self.dockerApi.updateService(
-                CaptainConstants.captainServiceName,
-                CaptainConstants.configs.publishedNameOnDockerHub +
-                    ':' +
-                    versionTag,
-                undefined,
-                undefined,
-                undefined,
-                undefined,
-                undefined,
-                undefined,
-                undefined,
-                undefined,
-                undefined,
-                undefined,
-                undefined,
-                undefined
-            )
-        })
-    }
-
     getMyNodeId() {
         if (!this.myNodeId) {
             const msg = 'myNodeId is not set yet!!'
diff --git a/src/user/system/VersionManager.ts b/src/user/system/VersionManager.ts
new file mode 100644
index 0000000..9f65529
--- /dev/null
+++ b/src/user/system/VersionManager.ts
@@ -0,0 +1,124 @@
+import request = require('request')
+import CaptainConstants = require('../../utils/CaptainConstants')
+import DockerApi from '../../docker/DockerApi'
+
+class VersionManager {
+    private dockerApi: DockerApi
+
+    constructor() {
+        const dockerApi = DockerApi.get()
+        this.dockerApi = dockerApi
+    }
+
+    getCaptainImageTags() {
+        const url =
+            'https://hub.docker.com/v2/repositories/' +
+            CaptainConstants.configs.publishedNameOnDockerHub +
+            '/tags'
+
+        return new Promise<string[]>(function(resolve, reject) {
+            request(
+                url,
+
+                function(error, response, body) {
+                    if (CaptainConstants.isDebug) {
+                        resolve(['v0.0.1'])
+                        return
+                    }
+
+                    if (error) {
+                        reject(error)
+                    } else if (!body || !JSON.parse(body).results) {
+                        reject(
+                            new Error(
+                                'Received empty body or no result for version list on docker hub.'
+                            )
+                        )
+                    } else {
+                        const results = JSON.parse(body).results
+                        const tags = []
+                        for (let idx = 0; idx < results.length; idx++) {
+                            tags.push(results[idx].name)
+                        }
+                        resolve(tags)
+                    }
+                }
+            )
+        }).then(function(tagList) {
+            let currentVersion = CaptainConstants.configs.version.split('.')
+            let latestVersion = CaptainConstants.configs.version.split('.')
+
+            let canUpdate = false
+
+            for (let i = 0; i < tagList.length; i++) {
+                let tag = tagList[i].split('.')
+
+                if (tag.length !== 3) {
+                    continue
+                }
+
+                if (Number(tag[0]) > Number(currentVersion[0])) {
+                    canUpdate = true
+                    latestVersion = tag
+                    break
+                } else if (
+                    Number(tag[0]) === Number(currentVersion[0]) &&
+                    Number(tag[1]) > Number(currentVersion[1])
+                ) {
+                    canUpdate = true
+                    latestVersion = tag
+                    break
+                } else if (
+                    Number(tag[0]) === Number(currentVersion[0]) &&
+                    Number(tag[1]) === Number(currentVersion[1]) &&
+                    Number(tag[2]) > Number(currentVersion[2])
+                ) {
+                    canUpdate = true
+                    latestVersion = tag
+                    break
+                }
+            }
+
+            return {
+                currentVersion: currentVersion.join('.'),
+                latestVersion: latestVersion.join('.'),
+                canUpdate: canUpdate,
+            }
+        })
+    }
+
+    updateCaptain(versionTag: string) {
+        const self = this
+        return Promise.resolve().then(function() {
+            return self.dockerApi.updateService(
+                CaptainConstants.captainServiceName,
+                CaptainConstants.configs.publishedNameOnDockerHub +
+                    ':' +
+                    versionTag,
+                undefined,
+                undefined,
+                undefined,
+                undefined,
+                undefined,
+                undefined,
+                undefined,
+                undefined,
+                undefined,
+                undefined,
+                undefined,
+                undefined
+            )
+        })
+    }
+
+    private static captainManagerInstance: VersionManager | undefined
+
+    static get(): VersionManager {
+        if (!VersionManager.captainManagerInstance) {
+            VersionManager.captainManagerInstance = new VersionManager()
+        }
+        return VersionManager.captainManagerInstance
+    }
+}
+
+export default VersionManager