diff --git a/setup.py b/setup.py
index fd678eee0..aba75579e 100644
--- a/setup.py
+++ b/setup.py
@@ -32,6 +32,7 @@
     "google-auth >= 1.11.0, < 2.0dev",
     "google-cloud-core >= 1.4.1, < 2.0dev",
     "google-resumable-media >= 1.0.0, < 2.0dev",
+    "requests >= 2.18.0, < 3.0.0dev",
 ]
 extras = {}