diff --git a/lib/msnodesqlv8/connection-pool.js b/lib/msnodesqlv8/connection-pool.js
index 217781f4..7ffa7012 100644
--- a/lib/msnodesqlv8/connection-pool.js
+++ b/lib/msnodesqlv8/connection-pool.js
@@ -7,48 +7,31 @@ const { IDS, INCREMENT } = require('../utils')
 const shared = require('../shared')
 const ConnectionError = require('../error/connection-error')
 const { platform } = require('os')
+const { buildConnectionString } = require('@tediousjs/connection-string')
 
 const CONNECTION_DRIVER = ['darwin', 'linux'].includes(platform()) ? 'ODBC Driver 17 for SQL Server' : 'SQL Server Native Client 11.0'
-const CONNECTION_STRING_PORT = `Driver=${CONNECTION_DRIVER};Server=#{server},#{port};Database=#{database};Uid=#{user};Pwd=#{password};Trusted_Connection=#{trusted};Encrypt=#{encrypt};`
-const CONNECTION_STRING_NAMED_INSTANCE = `Driver=${CONNECTION_DRIVER};Server=#{server}\\#{instance};Database=#{database};Uid=#{user};Pwd=#{password};Trusted_Connection=#{trusted};Encrypt=#{encrypt};`
 
 class ConnectionPool extends BaseConnectionPool {
   _poolCreate () {
     return new shared.Promise((resolve, reject) => {
-      let defaultConnectionString = CONNECTION_STRING_PORT
-
-      if (this.config.options.instanceName != null) {
-        defaultConnectionString = CONNECTION_STRING_NAMED_INSTANCE
-      }
-
       this.config.requestTimeout = this.config.requestTimeout ?? this.config.timeout ?? 15000
 
       const cfg = {
-        conn_str: this.config.connectionString || defaultConnectionString,
+        conn_str: this.config.connectionString,
         conn_timeout: (this.config.connectionTimeout ?? this.config.timeout ?? 15000) / 1000
       }
 
-      cfg.conn_str = cfg.conn_str.replace(/#{([^}]*)}/g, (p) => {
-        const key = p.substr(2, p.length - 3)
-
-        switch (key) {
-          case 'instance':
-            return this.config.options.instanceName
-          case 'trusted':
-            return this.config.options.trustedConnection ? 'Yes' : 'No'
-          case 'encrypt':
-            return this.config.options.encrypt ? 'Yes' : 'No'
-          default: {
-            let val = this.config[key] || ''
-            // quote strings that contain '{' or '}' but not ones that start and end with them (assume they are already quoted)
-            if (val && typeof val === 'string' && !(val.startsWith('{') && val.endsWith('}')) && (val.indexOf('{') !== -1 || val.indexOf('}') !== -1)) {
-              // quote values in `{}` and escape any existing `}` chars
-              val = `{${val.replace(/}/g, '}}')}}`
-            }
-            return val
-          }
-        }
-      })
+      if (!this.config.connectionString) {
+        cfg.conn_str = buildConnectionString({
+          Driver: CONNECTION_DRIVER,
+          Server: this.config.options.instanceName ? `${this.config.server}\\${this.config.instanceName}` : `${this.config.server},${this.config.port}`,
+          Database: this.config.database,
+          Uid: this.config.user,
+          Pwd: this.config.password,
+          Trusted_Connection: !!this.config.options.trustedConnection,
+          Encrypt: !!this.config.options.encrypt
+        })
+      }
 
       const connedtionId = INCREMENT.Connection++
       debug('pool(%d): connection #%d created', IDS.get(this), connedtionId)
diff --git a/package-lock.json b/package-lock.json
index 8d8657d1..7b55abdc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,7 +9,7 @@
       "version": "9.1.1",
       "license": "MIT",
       "dependencies": {
-        "@tediousjs/connection-string": "^0.4.1",
+        "@tediousjs/connection-string": "^0.5.0",
         "commander": "^11.0.0",
         "debug": "^4.3.3",
         "rfdc": "^1.3.0",
@@ -1738,9 +1738,9 @@
       }
     },
     "node_modules/@tediousjs/connection-string": {
-      "version": "0.4.4",
-      "resolved": "https://registry.npmjs.org/@tediousjs/connection-string/-/connection-string-0.4.4.tgz",
-      "integrity": "sha512-Qssn7gmOILmqD0zkfA09YyFd52UajWYkLTTSi4Dx/XZaUuVcx4W4guv2rAVc5mm8wYRdonmG/HfFH3PS6izXAg=="
+      "version": "0.5.0",
+      "resolved": "https://registry.npmjs.org/@tediousjs/connection-string/-/connection-string-0.5.0.tgz",
+      "integrity": "sha512-7qSgZbincDDDFyRweCIEvZULFAw5iz/DeunhvuxpL31nfntX3P4Yd4HkHBRg9H8CdqY1e5WFN1PZIz/REL9MVQ=="
     },
     "node_modules/@tootallnate/once": {
       "version": "2.0.0",
@@ -12696,9 +12696,9 @@
       }
     },
     "@tediousjs/connection-string": {
-      "version": "0.4.4",
-      "resolved": "https://registry.npmjs.org/@tediousjs/connection-string/-/connection-string-0.4.4.tgz",
-      "integrity": "sha512-Qssn7gmOILmqD0zkfA09YyFd52UajWYkLTTSi4Dx/XZaUuVcx4W4guv2rAVc5mm8wYRdonmG/HfFH3PS6izXAg=="
+      "version": "0.5.0",
+      "resolved": "https://registry.npmjs.org/@tediousjs/connection-string/-/connection-string-0.5.0.tgz",
+      "integrity": "sha512-7qSgZbincDDDFyRweCIEvZULFAw5iz/DeunhvuxpL31nfntX3P4Yd4HkHBRg9H8CdqY1e5WFN1PZIz/REL9MVQ=="
     },
     "@tootallnate/once": {
       "version": "2.0.0",
diff --git a/package.json b/package.json
index 56966449..5f046ed7 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
   "repository": "github:tediousjs/node-mssql",
   "license": "MIT",
   "dependencies": {
-    "@tediousjs/connection-string": "^0.4.1",
+    "@tediousjs/connection-string": "^0.5.0",
     "commander": "^11.0.0",
     "debug": "^4.3.3",
     "rfdc": "^1.3.0",