diff --git a/go.mod b/go.mod
index 1a4d8d62..39546390 100644
--- a/go.mod
+++ b/go.mod
@@ -87,7 +87,7 @@ require (
 	github.com/LeanerCloud/cloud-commitments-go/pkg v0.0.0-20261008100513-a9a426224031
 	github.com/LeanerCloud/cloud-commitments-go/providers/aws v0.0.0-20261003204812-9962786e0695
 	github.com/LeanerCloud/cloud-commitments-go/providers/azure v0.0.0-20261007130138-e24345ce68f8
-	github.com/LeanerCloud/cloud-commitments-go/providers/gcp v0.0.0-20260929223111-a32fd1a178e9
+	github.com/LeanerCloud/cloud-commitments-go/providers/gcp v0.0.0-20261009093408-2c18f303abfc
 	github.com/aws/aws-lambda-go v1.47.0
 	github.com/aws/aws-sdk-go-v2/service/kms v1.50.4
 	github.com/aws/aws-sdk-go-v2/service/lambda v1.89.0
diff --git a/go.sum b/go.sum
index 93810e40..c8e552af 100644
--- a/go.sum
+++ b/go.sum
@@ -98,8 +98,8 @@ github.com/LeanerCloud/cloud-commitments-go/providers/aws v0.0.0-20261003204812-
 github.com/LeanerCloud/cloud-commitments-go/providers/aws v0.0.0-20261003204812-9962786e0695/go.mod h1:d4nsy61/Ptib0SxqMg0ble3yksVm3+QbtUtmGja82PA=
 github.com/LeanerCloud/cloud-commitments-go/providers/azure v0.0.0-20261007130138-e24345ce68f8 h1:4qx5bagtW25H5X+whaZ/3tWXP7VGyG/qcypTh8yK7Hc=
 github.com/LeanerCloud/cloud-commitments-go/providers/azure v0.0.0-20261007130138-e24345ce68f8/go.mod h1:iIvPuWLWd+SXqLHAQNdodYMUAAcq7PnwfScXWgARt5A=
-github.com/LeanerCloud/cloud-commitments-go/providers/gcp v0.0.0-20260929223111-a32fd1a178e9 h1:8OuEGhDypUxV0zv+RisoPKW+i1OGst1DBcNj0gkeA98=
-github.com/LeanerCloud/cloud-commitments-go/providers/gcp v0.0.0-20260929223111-a32fd1a178e9/go.mod h1:SRfSbPLG/s8xQsiQUEuo8KXVthI5NUUQXWahoccfutc=
+github.com/LeanerCloud/cloud-commitments-go/providers/gcp v0.0.0-20261009093408-2c18f303abfc h1:hCLUvpI5U42BRh4M9EvjKaBg70P2ijbKxO9eNn7wMK0=
+github.com/LeanerCloud/cloud-commitments-go/providers/gcp v0.0.0-20261009093408-2c18f303abfc/go.mod h1:D2ZwYqlDm/304JWfOw8YX/e+/YTc51Q9kiIaHJN7nxY=
 github.com/Microsoft/go-winio v0.6.2 h1:F2VQgta7ecxGYO8k3ZZz3RS8fVIXVxONVUPlNERoyfY=
 github.com/Microsoft/go-winio v0.6.2/go.mod h1:yd8OoFMLzJbo9gZq8j5qaps8bJ9aShtEA8Ipt1oGCvU=
 github.com/aws/aws-lambda-go v1.47.0 h1:0H8s0vumYx/YKs4sE7YM0ktwL2eWse+kfopsRI1sXVI=
diff --git a/internal/purchase/gcp_history_cost_test.go b/internal/purchase/gcp_history_cost_test.go
index 7f891cf4..89bd76ec 100644
--- a/internal/purchase/gcp_history_cost_test.go
+++ b/internal/purchase/gcp_history_cost_test.go
@@ -2,6 +2,7 @@ package purchase
 
 import (
 	"context"
+	"errors"
 	"testing"
 
 	"cloud.google.com/go/compute/apiv1/computepb"
@@ -29,6 +30,12 @@ func (fakeCommitmentsService) Insert(context.Context, *computepb.InsertRegionCom
 	return fakeCommitmentOp{}, nil
 }
 
+// Get is only reached when an insert returns 409; this fake never does, so a
+// call means the test no longer drives the path it was written for.
+func (fakeCommitmentsService) Get(context.Context, *computepb.GetRegionCommitmentRequest) (*computepb.Commitment, error) {
+	return nil, errors.New("fakeCommitmentsService.Get is not expected in this test")
+}
+
 func (fakeCommitmentsService) Close() error { return nil }
 
 // TestSavePurchaseHistory_GCPRecordsNoUpfront drives the real library GCP client