diff --git a/go.mod b/go.mod
index 33b9e0e..d22c6e3 100644
--- a/go.mod
+++ b/go.mod
@@ -10,7 +10,7 @@ require (
 	cloud.google.com/go/redis v1.18.3
 	cloud.google.com/go/run v1.15.0
 	cloud.google.com/go/storage v1.61.3
-	github.com/GoCodeAlone/workflow v0.53.0
+	github.com/GoCodeAlone/workflow v0.54.0
 	google.golang.org/api v0.272.0
 	google.golang.org/grpc v1.80.0
 	google.golang.org/protobuf v1.36.11
diff --git a/go.sum b/go.sum
index b41d2da..0b6ac71 100644
--- a/go.sum
+++ b/go.sum
@@ -56,8 +56,8 @@ github.com/GoCodeAlone/modular/modules/jsonschema v1.15.0 h1:xb1mI4NZkzvNKQ2F6nk
 github.com/GoCodeAlone/modular/modules/jsonschema v1.15.0/go.mod h1:hhGouwAVsonmJ4Lain4jINZ9nZCoc9l9eF3BHbmR8eE=
 github.com/GoCodeAlone/modular/modules/reverseproxy/v2 v2.8.0 h1:cvdLHbM/vzvygQTcAWSJsy+dAPzzwWyjzKMmTBFcFIo=
 github.com/GoCodeAlone/modular/modules/reverseproxy/v2 v2.8.0/go.mod h1:/9ipMG4qM2CHQ14BfXKdVlYRJelef6M8MFI5TbZv67M=
-github.com/GoCodeAlone/workflow v0.53.0 h1:+UjoWNHRB1aPiQfWJUltsXnZfupsqbGmItv9xZto4kY=
-github.com/GoCodeAlone/workflow v0.53.0/go.mod h1:L1kIOZqebO1WPriHXcqT7bg/uS7pExR8pOrWvurqhR4=
+github.com/GoCodeAlone/workflow v0.54.0 h1:8x5iVQ8di2BAAyr/uAD/PllTa1Sw9OFElMkje0onKB8=
+github.com/GoCodeAlone/workflow v0.54.0/go.mod h1:RrmHdww6gAIUfyjJ7stz0fegxRmVGZvQ1FsuJ2F0C+U=
 github.com/GoCodeAlone/yaegi v0.17.2 h1:WK6Y6e0t1a6U7r+S2dN3CGWW1PizYD3zO0zneToZPxM=
 github.com/GoCodeAlone/yaegi v0.17.2/go.mod h1:z5Pr6Wse6QJcQvpgxTxzMAevFarH0N37TG88Y9dprx0=
 github.com/GoogleCloudPlatform/opentelemetry-operations-go/detectors/gcp v1.32.0 h1:rIkQfkCOVKc1OiRCNcSDD8ml5RJlZbH/Xsq7lbpynwc=
@@ -689,8 +689,8 @@ go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.43.0 h1:88Y4s2C8oTui1LGM6bT
 go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.43.0/go.mod h1:Vl1/iaggsuRlrHf/hfPJPvVag77kKyvrLeD10kpMl+A=
 go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.43.0 h1:3iZJKlCZufyRzPzlQhUIWVmfltrXuGyfjREgGP3UUjc=
 go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.43.0/go.mod h1:/G+nUPfhq2e+qiXMGxMwumDrP5jtzU+mWN7/sjT2rak=
-go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v1.43.0 h1:TC+BewnDpeiAmcscXbGMfxkO+mwYUwE/VySwvw88PfA=
-go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v1.43.0/go.mod h1:J/ZyF4vfPwsSr9xJSPyQ4LqtcTPULFR64KwTikGLe+A=
+go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v1.40.0 h1:ZrPRak/kS4xI3AVXy8F7pipuDXmDsrO8Lg+yQjBLjw0=
+go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v1.40.0/go.mod h1:3y6kQCWztq6hyW8Z9YxQDDm0Je9AJoFar2G0yDcmhRk=
 go.opentelemetry.io/otel/metric v1.43.0 h1:d7638QeInOnuwOONPp4JAOGfbCEpYb+K6DVWvdxGzgM=
 go.opentelemetry.io/otel/metric v1.43.0/go.mod h1:RDnPtIxvqlgO8GRW18W6Z/4P462ldprJtfxHxyKd2PY=
 go.opentelemetry.io/otel/sdk v1.43.0 h1:pi5mE86i5rTeLXqoF/hhiBtUNcrAGHLKQdhg4h4V9Dg=
diff --git a/internal/iacserver.go b/internal/iacserver.go
index a7b508d..c522903 100644
--- a/internal/iacserver.go
+++ b/internal/iacserver.go
@@ -122,7 +122,7 @@ func (s *gcpIaCServer) Capabilities(_ context.Context, _ *pb.CapabilitiesRequest
 			Operations:   append([]string(nil), c.Operations...),
 		})
 	}
-	return &pb.CapabilitiesResponse{Capabilities: out}, nil
+	return &pb.CapabilitiesResponse{Capabilities: out, ComputePlanVersion: "v2"}, nil
 }
 
 func (s *gcpIaCServer) Plan(ctx context.Context, req *pb.PlanRequest) (*pb.PlanResponse, error) {
diff --git a/internal/iacserver_test.go b/internal/iacserver_test.go
index 6f1b325..13ab8d5 100644
--- a/internal/iacserver_test.go
+++ b/internal/iacserver_test.go
@@ -59,6 +59,22 @@ func TestGCPIaCServer_Capabilities_HasContainerService(t *testing.T) {
 	}
 }
 
+// TestGCPIaCServer_Capabilities_ComputePlanVersionV2 pins the Phase 2
+// contract signal: the plugin MUST declare ComputePlanVersion="v2" so
+// wfctl v0.54.0+ knows to expect populated ApplyResult.Actions. Per
+// workflow#640 Phase 2 + ADR 0040. A typo or accidental drop in
+// internal/iacserver.go Capabilities() return literal fails this test.
+func TestGCPIaCServer_Capabilities_ComputePlanVersionV2(t *testing.T) {
+	s := NewIaCServer()
+	resp, err := s.Capabilities(context.Background(), &pb.CapabilitiesRequest{})
+	if err != nil {
+		t.Fatalf("Capabilities: %v", err)
+	}
+	if got, want := resp.GetComputePlanVersion(), "v2"; got != want {
+		t.Errorf("ComputePlanVersion: got %q, want %q", got, want)
+	}
+}
+
 func TestGCPIaCServer_Initialize_MissingProjectID(t *testing.T) {
 	s := NewIaCServer()
 	_, err := s.Initialize(context.Background(), &pb.InitializeRequest{ConfigJson: []byte(`{}`)})
diff --git a/plugin.json b/plugin.json
index 1f1ecc1..7fb66c9 100644
--- a/plugin.json
+++ b/plugin.json
@@ -6,7 +6,7 @@
   "type": "external",
   "tier": "community",
   "license": "MIT",
-  "minEngineVersion": "0.53.0",
+  "minEngineVersion": "0.54.0",
   "repository": "https://github.com/GoCodeAlone/workflow-plugin-gcp",
   "keywords": ["gcp", "google-cloud", "iac", "provider", "infrastructure"],
   "capabilities": {