diff --git a/src/google/adk/tools/spanner/spanner_credentials.py b/src/google/adk/tools/spanner/spanner_credentials.py
index 69279a49..22bb5694 100644
--- a/src/google/adk/tools/spanner/spanner_credentials.py
+++ b/src/google/adk/tools/spanner/spanner_credentials.py
@@ -18,7 +18,10 @@ from ...utils.feature_decorator import experimental
 from .._google_credentials import BaseGoogleCredentialsConfig
 
 SPANNER_TOKEN_CACHE_KEY = "spanner_token_cache"
-SPANNER_DEFAULT_SCOPE = ["https://www.googleapis.com/auth/spanner.data"]
+SPANNER_DEFAULT_SCOPE = [
+    "https://www.googleapis.com/auth/spanner.admin",
+    "https://www.googleapis.com/auth/spanner.data",
+]
 
 
 @experimental
diff --git a/tests/unittests/tools/spanner/test_spanner_credentials.py b/tests/unittests/tools/spanner/test_spanner_credentials.py
index 19430e14..d998aa25 100644
--- a/tests/unittests/tools/spanner/test_spanner_credentials.py
+++ b/tests/unittests/tools/spanner/test_spanner_credentials.py
@@ -48,6 +48,7 @@ class TestSpannerCredentials:
     assert config.client_id == "test_client_id"
     assert config.client_secret == "test_client_secret"
     assert config.scopes == [
+        "https://www.googleapis.com/auth/spanner.admin",
         "https://www.googleapis.com/auth/spanner.data",
     ]