diff --git a/docs/DEPLOYMENT_SETUP.md b/docs/DEPLOYMENT_SETUP.md
index 60f3b48beb..fdf42b1318 100644
--- a/docs/DEPLOYMENT_SETUP.md
+++ b/docs/DEPLOYMENT_SETUP.md
@@ -302,7 +302,6 @@ Note that MyInfo is currently not supported for storage mode forms and enabling
 | `CP_IDP_CERT_PATH`              | Path to National Digital Identity office's X.509 cert used for CorpPass related communication.                                                                                                  |
 | `MYINFO_CLIENT_CONFIG`          | Configures [MyInfoGovClient](https://github.com/opengovsg/myinfo-gov-client). Set this to either`stg` or `prod` to fetch MyInfo data from the corresponding endpoints.                          |
 | `MYINFO_FORMSG_KEY_PATH`        | Filepath to MyInfo private key, which is used to decrypt returned responses.                                                                                                                    |
-| `MYINFO_APP_KEY`                | (deprecated) Directly specify contents of the MyInfo FormSG private key. Only works if `NODE_ENV` is set to `development`.                                                                      |
 | `IS_SP_MAINTENANCE`             | If set, displays a banner message on SingPass forms. Overrides `IS_CP_MAINTENANCE`.                                                                                                             |
 | `IS_CP_MAINTENANCE`             | If set, displays a banner message on CorpPass forms.                                                                                                                                            |
 | `FILE_SYSTEM_ID`                | The id of the AWS Elastic File System (EFS) file system to mount onto the instances.                                                                                                            |
diff --git a/src/app/factories/spcp-myinfo.factory.js b/src/app/factories/spcp-myinfo.factory.js
index 6a1918a323..fb8befa061 100644
--- a/src/app/factories/spcp-myinfo.factory.js
+++ b/src/app/factories/spcp-myinfo.factory.js
@@ -66,11 +66,6 @@ const spcpFactory = ({ isEnabled, props }) => {
       myInfoConfig.appId = myInfoPrefix + myInfoConfig.singpassEserviceId
       myInfoConfig.mode = process.env.MYINFO_CLIENT_CONFIG
       myInfoGovClient = new MyInfoGovClient(myInfoConfig)
-    } else if (config.isDev && process.env.MYINFO_APP_KEY) {
-      myInfoConfig.appId = 'STG2-' + myInfoConfig.singpassEserviceId
-      myInfoConfig.privateKey = process.env.MYINFO_APP_KEY
-      myInfoConfig.mode = 'stg'
-      myInfoGovClient = new MyInfoGovClient(myInfoConfig)
     } else {
       logger.warn({
         message: `\n!!! WARNING !!!\nNo MyInfo keys detected.\nRequests to MyInfo will not work.\nThis should NEVER be seen in production.\nFalling back on MockPass.`,