diff --git a/src/Contract/PardotAuthenticator.php b/src/Contract/PardotAuthenticator.php
index 6310d8c..982aa06 100644
--- a/src/Contract/PardotAuthenticator.php
+++ b/src/Contract/PardotAuthenticator.php
@@ -33,7 +33,7 @@ public function getUserKey(): string;
      *
      * @return void
      */
-    public function doAuthentication(): void;
+    public function doAuthentication();
   
     /**
      * Returns the Response object or null on failure
diff --git a/src/PardotAuthenticator.php b/src/PardotAuthenticator.php
index ace3077..ba39845 100644
--- a/src/PardotAuthenticator.php
+++ b/src/PardotAuthenticator.php
@@ -121,10 +121,10 @@ public function getUserKey(): string
     /**
      * Performs the login authentication request to return and set the API key 
      *
-     * @return void
+     * @return static
      * @throws Exception
      */
-    public function doAuthentication(): void
+    public function doAuthentication()
     {
         try {
             $this->authenticated = true;
@@ -147,6 +147,7 @@ public function doAuthentication(): void
                 die;
             }
         }
+        return $this;
     }
 
     /**