diff --git a/README.md b/README.md
index 6387bc7..72b72e2 100644
--- a/README.md
+++ b/README.md
@@ -6,14 +6,16 @@ This action uploads an entire directory to your remote SFTP server on push.
 
 _(all default to an empty string)_
 
-| Name      | Required? | Description                                                                     |
-| --------- | --------- | ------------------------------------------------------------------------------- |
-| host      | yes       | SFTP server                                                                     |
-| port      | yes       | SFTP server port                                                                |
-| username  | yes       | SFTP username                                                                   |
-| password  | yes       | SFTP password                                                                   |
-| sourceDir | yes       | Source directory to upload from (will upload all files in this directory)       |
-| targetDir | yes       | Remote directory to upload to (WARNING: overwrites ALL files in this directory) |
+| Name       | Required? | Description                                                                     |
+| ---------- | --------- | ------------------------------------------------------------------------------- |
+| host       | yes       | SFTP server                                                                     |
+| port       | yes       | SFTP server port                                                                |
+| username   | no       | SFTP username                                                                    |
+| password   | no       | SFTP password                                                                    |
+| sourceDir  | yes       | Source directory to upload from (will upload all files in this directory)       |
+| targetDir  | yes       | Remote directory to upload to (WARNING: overwrites ALL files in this directory) |
+| privateKey | no        | SSH key to authenticate with                                                    |
+| passphrase | no        | Passphrase for an encrypted private key                                         |
 
 ## Example usage
 
diff --git a/action.yml b/action.yml
index 7d71f51..d4e4c40 100644
--- a/action.yml
+++ b/action.yml
@@ -11,12 +11,18 @@ inputs:
     default: '22'
   username:
     description: 'SFTP username'
-    required: true
+    required: false
     default: ''
   password:
     description: 'SFTP password'
-    required: true
+    required: false
     default: ''
+  privateKey:
+    description: "SSH Key"
+    required: false
+  passphrase:
+    description: "Passphrase for encrypted private keys"
+    required: false
   sourceDir:
     description: 'Source directory to upload from (will upload all files in this directory)'
     required: true
diff --git a/index.js b/index.js
index 4897ed2..a16dd6a 100644
--- a/index.js
+++ b/index.js
@@ -7,6 +7,8 @@ const username = core.getInput('username')
 const password = core.getInput('password')
 const sourceDir = core.getInput('sourceDir')
 const targetDir = core.getInput('targetDir')
+const privateKey = core.getInput('privateKey')
+const passphrase = core.getInput('passphrase')
 
 core.info(`connecting to ${username}@${host}:${port}...`)
 
@@ -17,6 +19,8 @@ sftp
     port,
     username,
     password,
+    privateKey,
+    passphrase,
     readyTimeout: 5000,
     retries: 5,
   })
@@ -25,7 +29,7 @@ sftp
     return sftp.uploadDir(sourceDir, targetDir)
   })
   .then(() => {
-    core.info(`succesfully uploaded ${sourceDir} to ${targetDir} 🎉`)
+    core.info(`successfully uploaded ${sourceDir} to ${targetDir} 🎉`)
   })
   .catch((error) => {
     core.setFailed(error.message)