diff --git a/deploy.sh b/deploy.sh
index 5bf17b1..0afc960 100644
--- a/deploy.sh
+++ b/deploy.sh
@@ -71,7 +71,11 @@ while IFS= read -r line || [[ -n "$line" ]]; do
 done < "${ENV_FILE}"
 ENV_VARS="${ENV_VARS%,}"
 
-CLOUD_SQL_CONN=$(get_env_value "CLOUD_SQL_CONNECTION_NAME")
+# Prefer new key (MySQL tools), fallback to legacy key
+CLOUD_SQL_CONN=$(get_env_value "DB_CLOUD_SQL_CONNECTION_NAME")
+if [ -z "${CLOUD_SQL_CONN}" ]; then
+  CLOUD_SQL_CONN=$(get_env_value "CLOUD_SQL_CONNECTION_NAME")
+fi
 RUN_VPC_CONN=$(get_env_value "RUN_VPC_CONNECTOR")
 RUN_VPC_EGRESS=$(get_env_value "RUN_VPC_EGRESS")