diff --git a/setup.py b/setup.py
index 66e115c..26d06e7 100644
--- a/setup.py
+++ b/setup.py
@@ -28,7 +28,7 @@
 # 'Development Status :: 5 - Production/Stable'
 release_status = "Development Status :: 5 - Production/Stable"
 dependencies = [
-    "google-api-core >= 1.21.0, < 2.0.0dev",
+    "google-api-core >= 1.21.0, < 3.0.0dev",
     "google-auth >= 1.24.0, < 2.0dev",
     # Support six==1.12.0 due to App Engine standard runtime.
     # https://github.com/googleapis/python-cloud-core/issues/45