diff --git a/lib/langchain/llm/google_vertexai.rb b/lib/langchain/llm/google_vertexai.rb
index a59ba95dd..bd709becc 100644
--- a/lib/langchain/llm/google_vertexai.rb
+++ b/lib/langchain/llm/google_vertexai.rb
@@ -28,7 +28,7 @@ class GoogleVertexAI < Base
     def initialize(project_id:, region:, default_options: {})
       depends_on "googleauth"
 
-      @authorizer = ::Google::Auth.get_application_default(scope: [
+      @authorizer = ::Google::Auth.get_application_default([
         "https://www.googleapis.com/auth/cloud-platform",
         "https://www.googleapis.com/auth/generative-language.retriever"
       ])