diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ac2534a..576bf72 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -279,7 +279,7 @@ jobs:
   # ── RELAY conformance gate ────────────────────────────────────────────────
   # Validates the go-can CLI version/capabilities/status output against the
   # authoritative RELAY §12 JSON Schemas. Pinned to the spec version go-CAN
-  # targets (v1.6.x) so a spec bump is an explicit upgrade, not a surprise.
+  # targets (v2.0.x) so a spec bump is an explicit upgrade, not a surprise.
   relay-conform:
     name: RELAY conform
     runs-on: ubuntu-latest
@@ -290,7 +290,7 @@ jobs:
           go-version: "1.25"
 
       - name: Install relay CLI
-        run: go install github.com/SoundMatt/RELAY/cmd/relay@v1.10.0
+        run: go install github.com/SoundMatt/RELAY/v2/cmd/relay@v2.0.4
 
       - name: Build go-can CLI
         run: go build -o /tmp/go-can ./cmd/cantool
diff --git a/ROADMAP.md b/ROADMAP.md
index 806db4f..dbfd9e9 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -48,6 +48,7 @@ protocol, with zero required dependencies in the core library.
 | v0.10.0 | RELAY spec v1.10 — §13.7 cross-language library architecture + §20 continuous conformance | shipped |
 | v0.10.1 | Patch: per-subscription Seq counters, capabilities accuracy, RELAY spec v1.11, README fix | shipped |
 | v0.11.0 | Interop testing infrastructure — two-process self-interop + can-utils third-party interop over real `vcan0` (Milestone 14) | shipped |
+| v0.12.1 | Patch: RELAY dependency bump v1.11.0 → `github.com/SoundMatt/RELAY/v2` v2.0.4 (module-path change per RELAY #70; spec v1.12–v1.14 + v2.0 reviewed for conformance impact, none applicable to CAN — verified live against the built `relay` v2.0.4 CLI) | shipped |
 | v1.0.0 | API stability, full SocketCAN feature set, documentation complete | planned |
 | v1.1.0 | **Bridge — MQTT** (`bridge/mqtt/`) — publish/subscribe CAN frames over MQTT topics | planned |
 | v1.2.0 | **Bridge — SOME/IP** (`bridge/someip/`) — translate CAN frames to/from SOME/IP service events | planned |
diff --git a/adapt.go b/adapt.go
index acd4019..8358370 100644
--- a/adapt.go
+++ b/adapt.go
@@ -12,7 +12,7 @@ import (
 	"strconv"
 	"time"
 
-	relay "github.com/SoundMatt/RELAY"
+	relay "github.com/SoundMatt/RELAY/v2"
 )
 
 // ToMessage converts a CAN Frame to a relay.Message for cross-protocol routing.
diff --git a/adapt_test.go b/adapt_test.go
index fec75e8..1db3c53 100644
--- a/adapt_test.go
+++ b/adapt_test.go
@@ -11,7 +11,7 @@ import (
 	"testing"
 	"time"
 
-	relay "github.com/SoundMatt/RELAY"
+	relay "github.com/SoundMatt/RELAY/v2"
 	can "github.com/SoundMatt/go-CAN"
 	"github.com/SoundMatt/go-CAN/virtual"
 )
diff --git a/can.go b/can.go
index 963cc5e..aa03ba1 100644
--- a/can.go
+++ b/can.go
@@ -25,7 +25,7 @@ package can
 import (
 	"context"
 
-	relay "github.com/SoundMatt/RELAY"
+	relay "github.com/SoundMatt/RELAY/v2"
 )
 
 //fusa:req REQ-CAN-001
diff --git a/can_vectors_test.go b/can_vectors_test.go
index 0cd9648..19e675d 100644
--- a/can_vectors_test.go
+++ b/can_vectors_test.go
@@ -11,7 +11,7 @@ import (
 	"path/filepath"
 	"testing"
 
-	relay "github.com/SoundMatt/RELAY"
+	relay "github.com/SoundMatt/RELAY/v2"
 	can "github.com/SoundMatt/go-CAN"
 )
 
diff --git a/cmd/cantool/main.go b/cmd/cantool/main.go
index d39314e..f31390f 100644
--- a/cmd/cantool/main.go
+++ b/cmd/cantool/main.go
@@ -33,13 +33,13 @@ import (
 	"syscall"
 	"time"
 
-	relay "github.com/SoundMatt/RELAY"
+	relay "github.com/SoundMatt/RELAY/v2"
 	can "github.com/SoundMatt/go-CAN"
 	"github.com/SoundMatt/go-CAN/recorder"
 	"github.com/SoundMatt/go-CAN/virtual"
 )
 
-const toolVersion = "0.11.0"
+const toolVersion = "0.12.1"
 
 func main() {
 	if len(os.Args) < 2 {
diff --git a/cmd/cantool/main_test.go b/cmd/cantool/main_test.go
index ce3f01e..92bae96 100644
--- a/cmd/cantool/main_test.go
+++ b/cmd/cantool/main_test.go
@@ -16,7 +16,7 @@ import (
 	"testing"
 	"time"
 
-	relay "github.com/SoundMatt/RELAY"
+	relay "github.com/SoundMatt/RELAY/v2"
 	can "github.com/SoundMatt/go-CAN"
 	"github.com/SoundMatt/go-CAN/virtual"
 )
diff --git a/go.mod b/go.mod
index ba8f58d..6845c99 100644
--- a/go.mod
+++ b/go.mod
@@ -3,6 +3,6 @@ module github.com/SoundMatt/go-CAN
 go 1.25.0
 
 require (
-	github.com/SoundMatt/RELAY v1.11.0
+	github.com/SoundMatt/RELAY/v2 v2.0.4
 	golang.org/x/sys v0.46.0
 )
diff --git a/go.sum b/go.sum
index 2ca2865..3dd6d3b 100644
--- a/go.sum
+++ b/go.sum
@@ -1,4 +1,4 @@
-github.com/SoundMatt/RELAY v1.11.0 h1:ZqGQpU/ak5FNW4AOHjtVA6vPGjJhXCwFzAICHlHjNFE=
-github.com/SoundMatt/RELAY v1.11.0/go.mod h1:8HXkxErdk4pHaM1de9eopm2S8o1aE7tKYkCBBsHxxcg=
+github.com/SoundMatt/RELAY/v2 v2.0.4 h1:e64zaug7jFfFCgTq6PDdUWwyiwxUF0ypg4u360PDs3M=
+github.com/SoundMatt/RELAY/v2 v2.0.4/go.mod h1:v/KbXSnTFSl4M44p0xLYyIH2eZ9rZ16CJCCbAropi24=
 golang.org/x/sys v0.46.0 h1:noSf2Fq6F8DBgS+LysIkx7rIExoNHJsxOAtPp4rthXw=
 golang.org/x/sys v0.46.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
diff --git a/socketcan/bus_linux.go b/socketcan/bus_linux.go
index 460509b..c9132c5 100644
--- a/socketcan/bus_linux.go
+++ b/socketcan/bus_linux.go
@@ -27,7 +27,7 @@ import (
 	"net"
 	"sync"
 
-	relay "github.com/SoundMatt/RELAY"
+	relay "github.com/SoundMatt/RELAY/v2"
 	can "github.com/SoundMatt/go-CAN"
 	"golang.org/x/sys/unix"
 )
diff --git a/virtual/bus.go b/virtual/bus.go
index 0937610..7614dfb 100644
--- a/virtual/bus.go
+++ b/virtual/bus.go
@@ -24,7 +24,7 @@ import (
 	"sync/atomic"
 	"time"
 
-	relay "github.com/SoundMatt/RELAY"
+	relay "github.com/SoundMatt/RELAY/v2"
 	can "github.com/SoundMatt/go-CAN"
 )