diff --git a/index.ts b/index.ts
index fe06bc8..f4f7a4e 100644
--- a/index.ts
+++ b/index.ts
@@ -55,7 +55,7 @@ const dialects = {
  */
 export function patchKnex(
   knex: Knex,
-  configFn: (config: Knex.Config) => Knex.ConnectionConfig
+  configFn: (config: Knex.Config) => Knex.ConnectionConfig | Promise<Knex.ConnectionConfig>
 ): void {
   const client = knex.client
   const clientName = resolveClientNameWithAliases(client.config.client)
@@ -90,8 +90,9 @@ export function patchKnex(
   /**
    * Returns a dynamic connection to be used for each query
    */
-  client.getRuntimeConnectionSettings =
-    function getRuntimeConnectionSettings(): Knex.ConnectionConfig {
-      return configFn(this.config)
-    }
+  client.getRuntimeConnectionSettings = function getRuntimeConnectionSettings():
+    | Knex.ConnectionConfig
+    | Promise<Knex.ConnectionConfig> {
+    return configFn(this.config)
+  }
 }
diff --git a/src/dialects/mssql.ts b/src/dialects/mssql.ts
index de032b4..7b8aa61 100644
--- a/src/dialects/mssql.ts
+++ b/src/dialects/mssql.ts
@@ -94,12 +94,12 @@ function generateConnection(settings: any) {
  * Copy of `acquireRawConnection` from knex codebase, but instead relies
  * on `getRuntimeConnectionSettings` vs `connectionSettings`
  */
-export function acquireRawConnection(): Promise<any> {
+export async function acquireRawConnection(): Promise<any> {
+  debug('connection::connection new connection requested')
+  const connectionSettings = await this.getRuntimeConnectionSettings()
   return new Promise((resolver, rejecter) => {
-    debug('connection::connection new connection requested')
-
     const Driver = this._driver()
-    const settings = Object.assign({}, generateConnection(this.getRuntimeConnectionSettings()))
+    const settings = Object.assign({}, generateConnection(connectionSettings))
 
     const connection = new Driver.Connection(settings)
 
diff --git a/src/dialects/mysql.ts b/src/dialects/mysql.ts
index 98ae0df..09fd8c5 100644
--- a/src/dialects/mysql.ts
+++ b/src/dialects/mysql.ts
@@ -11,9 +11,10 @@
  * Copy of `acquireRawConnection` from knex codebase, but instead relies
  * on `getRuntimeConnectionSettings` vs `connectionSettings`
  */
-export function acquireRawConnection(): Promise<any> {
+export async function acquireRawConnection(): Promise<any> {
+  const connectionSettings = await this.getRuntimeConnectionSettings()
   return new Promise((resolver, rejecter) => {
-    const connection = this.driver.createConnection(this.getRuntimeConnectionSettings())
+    const connection = this.driver.createConnection(connectionSettings)
     connection.on('error', (err: Error) => {
       connection.__knex__disposed = err
     })
diff --git a/src/dialects/oracledb.ts b/src/dialects/oracledb.ts
index 9cb3e29..04133cc 100644
--- a/src/dialects/oracledb.ts
+++ b/src/dialects/oracledb.ts
@@ -91,12 +91,11 @@ function readStream(stream, type) {
  * Copy of `acquireRawConnection` from knex codebase, but instead relies
  * on `getRuntimeConnectionSettings` vs `connectionSettings`
  */
-export function acquireRawConnection(): Promise<any> {
+export async function acquireRawConnection(): Promise<any> {
   const client = this
+  const settings = await client.getRuntimeConnectionSettings()
 
   const asyncConnection = new Promise(function (resolver, rejecter) {
-    const settings = client.getRuntimeConnectionSettings()
-
     // If external authentication don't have to worry about username/password and
     // if not need to set the username and password
     const oracleDbConfig = settings.externalAuth
diff --git a/src/dialects/pg.ts b/src/dialects/pg.ts
index 953dc6e..6844510 100644
--- a/src/dialects/pg.ts
+++ b/src/dialects/pg.ts
@@ -13,9 +13,9 @@
  * on `getRuntimeConnectionSettings` vs `connectionSettings`
  */
 /* eslint no-shadow: "off" */
-export function acquireRawConnection(): Promise<any> {
+export async function acquireRawConnection(): Promise<any> {
   const client = this
-  const connection = new client.driver.Client(client.getRuntimeConnectionSettings())
+  const connection = new client.driver.Client(await client.getRuntimeConnectionSettings())
   connection.on('error', (err: Error) => {
     connection.__knex__disposed = err
   })