diff --git a/pyproject.toml b/pyproject.toml
index 460644463a..7690cc3353 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,7 +37,7 @@ dependencies = [
   "google-cloud-bigquery-storage>=2.0.0",
   "google-cloud-bigquery>=2.2.0",
   "google-cloud-bigtable>=2.32.0",                           # For Bigtable database
-  "google-cloud-discoveryengine>=0.13.12, <0.14.0",          # For Discovery Engine Search Tool
+  "google-cloud-discoveryengine>=0.13.12, <0.18.0",          # For Discovery Engine Search Tool
   "google-cloud-pubsub>=2.0.0, <3.0.0",                      # For Pub/Sub Tool
   "google-cloud-secret-manager>=2.22.0, <3.0.0",             # Fetching secrets in RestAPI Tool
   "google-cloud-spanner>=3.56.0, <4.0.0",                    # For Spanner database