diff --git a/setup.py b/setup.py
index d1568c981..f58deefa9 100644
--- a/setup.py
+++ b/setup.py
@@ -17,7 +17,6 @@
 import os
 import pathlib
 
-
 import setuptools  # type: ignore
 
 package_root = pathlib.Path(__file__).parent.resolve()
@@ -44,7 +43,7 @@ def get_version():
 
 dependencies = [
     "google-ai-generativelanguage==0.4.0",
-    "google-auth",
+    "google-auth>=2.15.0",  # 2.15 adds API key auth support
     "google-api-core",
     "protobuf",
     "tqdm",