diff --git a/setup.py b/setup.py
index 2782259d3a..f1e69693da 100644
--- a/setup.py
+++ b/setup.py
@@ -145,6 +145,7 @@
 
 adk_extra_require = [
     "google-adk >= 1.5.0, < 3.0.0",
+    "aiohttp",  # for ADK users to use aiohttp
 ]
 
 reasoning_engine_extra_require = [