diff --git a/.fusa-evidence.json b/.fusa-evidence.json
index 74631e7..f02b97e 100644
--- a/.fusa-evidence.json
+++ b/.fusa-evidence.json
@@ -99,9 +99,9 @@
     {
       "id": "EV-011",
       "type": "relay_conformance",
-      "description": "RELAY v1.10 conformance — all sub-tests PASS, LIN golden vectors EQUIVALENT",
+      "description": "RELAY v1.11 conformance — all sub-tests PASS, LIN golden vectors EQUIVALENT",
       "artefact": "CI console output, conformance job",
-      "standard_ref": "RELAY spec v1.10 §20.1",
+      "standard_ref": "RELAY spec v1.11 §20.1",
       "status": "current",
       "generated_by": "relay conform ./target/release/rust-lin --strict"
     },
diff --git a/.fusa-reqs.json b/.fusa-reqs.json
index 96a8217..f85ea5b 100644
--- a/.fusa-reqs.json
+++ b/.fusa-reqs.json
@@ -136,7 +136,7 @@
       "title": "NoResponse returned when no slave response registered",
       "description": "send_header returns Error::NoResponse when no response is registered for the requested id",
       "asil": "ASIL-B",
-      "rationale": "RELAY spec v1.10 \u00a75.1: send_header returns Error::NoResponse when no response is re",
+      "rationale": "RELAY spec v1.11 \u00a75.1: send_header returns Error::NoResponse when no response is re",
       "tags": [
         "lin"
       ]
@@ -186,7 +186,7 @@
       "title": "to_message sets protocol = 3",
       "description": "RELAY adapter to_message must set Message::protocol = Protocol::Lin (3)",
       "asil": "ASIL-B",
-      "rationale": "RELAY spec v1.10 \u00a73.2: RELAY adapter to_message must set Message::protocol = Protoc",
+      "rationale": "RELAY spec v1.11 \u00a73.2: RELAY adapter to_message must set Message::protocol = Protoc",
       "tags": [
         "lin"
       ]
@@ -196,7 +196,7 @@
       "title": "from_message rejects wrong protocol",
       "description": "RELAY adapter from_message returns Err(InvalidFrame) when Message::protocol != Lin",
       "asil": "ASIL-B",
-      "rationale": "RELAY spec v1.10 \u00a73.2: RELAY adapter from_message returns Err(InvalidFrame) when Me",
+      "rationale": "RELAY spec v1.11 \u00a73.2: RELAY adapter from_message returns Err(InvalidFrame) when Me",
       "tags": [
         "lin"
       ]
@@ -206,7 +206,7 @@
       "title": "NoResponse kind maps to Timeout",
       "description": "Error::NoResponse::kind() must return relay::Error::Timeout (ErrNoResponse IS Timeout)",
       "asil": "ASIL-B",
-      "rationale": "RELAY spec v1.10 \u00a75.1: Error::NoResponse::kind() must return relay::Error::Timeout ",
+      "rationale": "RELAY spec v1.11 \u00a75.1: Error::NoResponse::kind() must return relay::Error::Timeout ",
       "tags": [
         "lin"
       ]
@@ -936,7 +936,7 @@
       "title": "Adapt returns a LIN relay::Node",
       "description": "adapt() wraps a Bus and returns a Box<dyn relay::Node> with Protocol::Lin",
       "asil": "QM",
-      "rationale": "RELAY spec v1.10 \u00a710.3: adapt() wraps a Bus and returns a Box<dyn relay::Node> with ",
+      "rationale": "RELAY spec v1.11 \u00a710.3: adapt() wraps a Bus and returns a Box<dyn relay::Node> with ",
       "tags": [
         "adapt"
       ]
@@ -946,7 +946,7 @@
       "title": "LinAdapter::send publishes payload for a valid frame ID",
       "description": "relay::Node::send calls Bus::publish with the parsed frame ID and payload",
       "asil": "QM",
-      "rationale": "RELAY spec v1.10 \u00a710.3: relay::Node::send calls Bus::publish with the parsed frame I",
+      "rationale": "RELAY spec v1.11 \u00a710.3: relay::Node::send calls Bus::publish with the parsed frame I",
       "tags": [
         "adapt"
       ]
@@ -956,7 +956,7 @@
       "title": "LinAdapter::send rejects an out-of-range frame ID",
       "description": "relay::Node::send returns relay::Error on non-numeric or out-of-range Message::id",
       "asil": "QM",
-      "rationale": "RELAY spec v1.10 \u00a710.3: relay::Node::send returns relay::Error on non-numeric or out",
+      "rationale": "RELAY spec v1.11 \u00a710.3: relay::Node::send returns relay::Error on non-numeric or out",
       "tags": [
         "adapt"
       ]
@@ -966,7 +966,7 @@
       "title": "LinAdapter::subscribe converts frames to relay::Message",
       "description": "relay::Node::subscribe returns a channel of relay::Message envelopes with Protocol::Lin and correct meta fields",
       "asil": "QM",
-      "rationale": "RELAY spec v1.10 \u00a710.3: relay::Node::subscribe returns a channel of relay::Message e",
+      "rationale": "RELAY spec v1.11 \u00a710.3: relay::Node::subscribe returns a channel of relay::Message e",
       "tags": [
         "adapt"
       ]
@@ -976,7 +976,7 @@
       "title": "LinAdapter::close closes the underlying bus",
       "description": "relay::Node::close delegates to Bus::close",
       "asil": "QM",
-      "rationale": "RELAY spec v1.10 \u00a710.3: relay::Node::close delegates to Bus::close",
+      "rationale": "RELAY spec v1.11 \u00a710.3: relay::Node::close delegates to Bus::close",
       "tags": [
         "adapt"
       ]
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6827fe1..6c85d47 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -77,7 +77,7 @@ jobs:
           d = json.load(sys.stdin)
           assert d['tool'] == 'rust-lin', f'bad tool: {d}'
           assert d['protocol'] == 'LIN', f'bad protocol: {d}'
-          assert d['spec_version'] == '1.10', f'bad spec_version: {d}'
+          assert d['spec_version'] == '1.11', f'bad spec_version: {d}'
           print('version JSON OK')
           "
           ./target/release/rust-lin capabilities | python3 -c "
@@ -251,7 +251,7 @@ jobs:
         run: cargo build --release --bin rust-lin --locked
 
       - name: Install relay
-        run: go install github.com/SoundMatt/RELAY/cmd/relay@v1.10.0
+        run: go install github.com/SoundMatt/RELAY/cmd/relay@v1.11.0
 
       - name: RELAY conformance (strict)
         run: relay conform ./target/release/rust-lin --strict
diff --git a/ARCHITECTURE.md b/ARCHITECTURE.md
index f8d9302..d697aeb 100644
--- a/ARCHITECTURE.md
+++ b/ARCHITECTURE.md
@@ -3,7 +3,7 @@
 ## Overview
 
 rust-LIN is an ASIL-B Rust library for LIN bus communication. It implements
-the RELAY v1.10 protocol adapter contract for LIN (Protocol::Lin = 3).
+the RELAY v1.11 protocol adapter contract for LIN (Protocol::Lin = 3).
 The library is a Safety Element Out Of Context (SEOOC) per ISO 26262-10:2018 §9.
 
 ```
@@ -48,7 +48,7 @@ Public surface. Re-exports all stable types and the `RELAY_SPEC_VERSION`
 constant. Declares module tree.
 
 ### `src/relay.rs`
-RELAY v1.10 primitives: `Protocol`, `Version`, `Message`, `Context`,
+RELAY v1.11 primitives: `Protocol`, `Version`, `Message`, `Context`,
 `BackPressurePolicy`, `SubscriberOptions`, `Health`, `Metrics`, `Node`,
 `Caller`. Protocol::Lin = 3.
 
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 4dacfb7..f3e5f10 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -84,7 +84,7 @@ Pull requests are reviewed against:
 
 - CODING_STANDARD.md
 - SAFETY_PLAN.md §4
-- RELAY spec v1.10 §5 (protocol adapter contract)
+- RELAY spec v1.11 §5 (protocol adapter contract)
 - ISO 26262 Part 6 §8 (coding guidelines)
 
 ---
diff --git a/README.md b/README.md
index f84fb9b..8357ba6 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ The `Bus` and `MasterBus` traits are stable. Implementations are swappable witho
 
 [![CI](https://github.com/SoundMatt/rust-LIN/actions/workflows/ci.yml/badge.svg)](https://github.com/SoundMatt/rust-LIN/actions/workflows/ci.yml)
 
-**RELAY spec:** v1.10 · **Safety:** ASIL-B (ISO 26262) · **Language:** Rust 2021
+**RELAY spec:** v1.11 · **Safety:** ASIL-B (ISO 26262) · **Language:** Rust 2021
 
 ---
 
@@ -19,7 +19,7 @@ The `Bus` and `MasterBus` traits are stable. Implementations are swappable witho
 | `virtual_bus` | In-process bus — zero OS dependencies, master+slave | All |
 | `mock` | Mock bus for unit testing with frame injection | All |
 | `master` | `MasterNode` — schedule table execution, callbacks | All |
-| `adapt` | RELAY v1.10 adapter — `adapt()`, `to_message()`, `from_message()` | All |
+| `adapt` | RELAY v1.11 adapter — `adapt()`, `to_message()`, `from_message()` | All |
 
 ---
 
diff --git a/ROADMAP.md b/ROADMAP.md
index b1ff264..fe55832 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -6,7 +6,7 @@
 - `VirtualBus` in-process implementation.
 - `MockBus` test double with frame injection.
 - `MasterNode` schedule table executor.
-- RELAY v1.10 adapter (`adapt`, `to_message`, `from_message`).
+- RELAY v1.11 adapter (`adapt`, `to_message`, `from_message`).
 - LIN 2.x PID computation and checksum (classic and enhanced).
 - Frame validation (ID, length, diagnostic checksum enforcement).
 - ASIL-B FuSa annotations on all exported functions and tests.
diff --git a/SAFETY_MANUAL.md b/SAFETY_MANUAL.md
index abc864e..2637d49 100644
--- a/SAFETY_MANUAL.md
+++ b/SAFETY_MANUAL.md
@@ -43,7 +43,7 @@ rust-LIN makes the following ASIL-B claims:
 | SC-12 | LDF parse() does not panic on any input | Unit test with empty/malformed LDF |
 | SC-13 | No unsafe code in library or binary | rsfusa lint CI gate |
 | SC-14 | Cyclomatic complexity V(G) ≤ 10 for all functions | rsfusa comp CI gate |
-| SC-15 | RELAY v1.10 adapter contract is satisfied | relay conform --strict CI gate |
+| SC-15 | RELAY v1.11 adapter contract is satisfied | relay conform --strict CI gate |
 
 ---
 
diff --git a/SAFETY_PLAN.md b/SAFETY_PLAN.md
index 8b5d174..f72e5ca 100644
--- a/SAFETY_PLAN.md
+++ b/SAFETY_PLAN.md
@@ -20,7 +20,7 @@ version 0.2.0) and its CLI binary (`rust-lin`). The library implements:
 - LIN Description File 2.x parser (`ldf::parse`) — `src/ldf/`
 - End-to-end safety protection (`safety::Protector`/`Receiver`) — `src/safety/`
 - ISO 26262 SEOOC declarations — `src/seooc.rs`
-- RELAY v1.10 protocol adapter — `src/adapt.rs`
+- RELAY v1.11 protocol adapter — `src/adapt.rs`
 
 **Target ASIL:** ASIL-B (ISO 26262-1:2018 §3.6).
 **SEOOC boundary:** rust-LIN is a Safety Element Out Of Context (ISO 26262-10:2018 §9).
diff --git a/requirements.json b/requirements.json
index 401761e..de91417 100644
--- a/requirements.json
+++ b/requirements.json
@@ -125,7 +125,7 @@
       "id": "REQ-LIN-014",
       "title": "NoResponse returned when no slave response registered",
       "description": "send_header returns Error::NoResponse when no response is registered for the requested id",
-      "source": "RELAY spec v1.10 §5.1",
+      "source": "RELAY spec v1.11 §5.1",
       "asil": "ASIL-B",
       "verification": "test",
       "status": "implemented"
@@ -170,7 +170,7 @@
       "id": "REQ-LIN-019",
       "title": "to_message sets protocol = 3",
       "description": "RELAY adapter to_message must set Message::protocol = Protocol::Lin (3)",
-      "source": "RELAY spec v1.10 §3.2",
+      "source": "RELAY spec v1.11 §3.2",
       "asil": "ASIL-B",
       "verification": "test",
       "status": "implemented"
@@ -179,7 +179,7 @@
       "id": "REQ-LIN-020",
       "title": "from_message rejects wrong protocol",
       "description": "RELAY adapter from_message returns Err(InvalidFrame) when Message::protocol != Lin",
-      "source": "RELAY spec v1.10 §3.2",
+      "source": "RELAY spec v1.11 §3.2",
       "asil": "ASIL-B",
       "verification": "test",
       "status": "implemented"
@@ -188,7 +188,7 @@
       "id": "REQ-LIN-021",
       "title": "NoResponse kind maps to Timeout",
       "description": "Error::NoResponse::kind() must return relay::Error::Timeout (ErrNoResponse IS Timeout)",
-      "source": "RELAY spec v1.10 §5.1",
+      "source": "RELAY spec v1.11 §5.1",
       "asil": "ASIL-B",
       "verification": "test",
       "status": "implemented"
@@ -845,7 +845,7 @@
       "id": "REQ-ADAPT-001",
       "title": "Adapt returns a LIN relay::Node",
       "description": "adapt() wraps a Bus and returns a Box<dyn relay::Node> with Protocol::Lin",
-      "source": "RELAY spec v1.10 §10.3",
+      "source": "RELAY spec v1.11 §10.3",
       "asil": "QM",
       "verification": "test",
       "status": "implemented"
@@ -854,7 +854,7 @@
       "id": "REQ-ADAPT-002",
       "title": "LinAdapter::send publishes payload for a valid frame ID",
       "description": "relay::Node::send calls Bus::publish with the parsed frame ID and payload",
-      "source": "RELAY spec v1.10 §10.3",
+      "source": "RELAY spec v1.11 §10.3",
       "asil": "QM",
       "verification": "test",
       "status": "implemented"
@@ -863,7 +863,7 @@
       "id": "REQ-ADAPT-003",
       "title": "LinAdapter::send rejects an out-of-range frame ID",
       "description": "relay::Node::send returns relay::Error on non-numeric or out-of-range Message::id",
-      "source": "RELAY spec v1.10 §10.3",
+      "source": "RELAY spec v1.11 §10.3",
       "asil": "QM",
       "verification": "test",
       "status": "implemented"
@@ -872,7 +872,7 @@
       "id": "REQ-ADAPT-004",
       "title": "LinAdapter::subscribe converts frames to relay::Message",
       "description": "relay::Node::subscribe returns a channel of relay::Message envelopes with Protocol::Lin and correct meta fields",
-      "source": "RELAY spec v1.10 §10.3",
+      "source": "RELAY spec v1.11 §10.3",
       "asil": "QM",
       "verification": "test",
       "status": "implemented"
@@ -881,7 +881,7 @@
       "id": "REQ-ADAPT-005",
       "title": "LinAdapter::close closes the underlying bus",
       "description": "relay::Node::close delegates to Bus::close",
-      "source": "RELAY spec v1.10 §10.3",
+      "source": "RELAY spec v1.11 §10.3",
       "asil": "QM",
       "verification": "test",
       "status": "implemented"
diff --git a/safety-case.json b/safety-case.json
index 8504043..025ed90 100644
--- a/safety-case.json
+++ b/safety-case.json
@@ -61,7 +61,7 @@
     },
     {
       "id": "SC-07",
-      "claim": "RELAY v1.10 conformance is demonstrated.",
+      "claim": "RELAY v1.11 conformance is demonstrated.",
       "evidence": [
         {"type": "conformance", "ref": "relay conform --strict (CI conformance job)"},
         {"type": "golden_vectors", "ref": "testdata/relay-vectors/"}
diff --git a/safety-case.md b/safety-case.md
index cf2ef2e..8f32584 100644
--- a/safety-case.md
+++ b/safety-case.md
@@ -88,15 +88,15 @@ ISO 26262-8 §11 / IEC 61508-3 §7.4.4 Method 3.
 
 ---
 
-## Sub-claim SC-07 — RELAY v1.10 conformance
+## Sub-claim SC-07 — RELAY v1.11 conformance
 
-**Claim:** rust-LIN correctly implements the RELAY v1.10 protocol adapter
+**Claim:** rust-LIN correctly implements the RELAY v1.11 protocol adapter
 contract for Protocol::Lin (3).
 
 **Evidence:**
 - `relay conform --strict` passes in CI (conformance job).
 - Golden vector tests in `testdata/relay-vectors/` pass in integration suite.
-- `RELAY_SPEC_VERSION = "1.10"` constant exported from library.
+- `RELAY_SPEC_VERSION = "1.11"` constant exported from library.
 
 ---
 
diff --git a/src/lib.rs b/src/lib.rs
index 5c9c3eb..3188286 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -6,7 +6,7 @@
 //! rust-LIN — LIN bus library for Rust.
 //!
 //! Provides a virtual bus, master/slave node support, LDF parser, and safety
-//! E2E protection. Conforms to RELAY spec v1.10.
+//! E2E protection. Conforms to RELAY spec v1.11.
 //!
 //! # Quick start
 //!
@@ -61,7 +61,7 @@ pub use frame::{
 };
 
 /// The RELAY spec version this implementation targets.
-pub const SPEC_VERSION: &str = "1.10";
+pub const SPEC_VERSION: &str = "1.11";
 
 /// Alias for `SPEC_VERSION` for explicitness in CLI contexts.
-pub const RELAY_SPEC_VERSION: &str = "1.10";
+pub const RELAY_SPEC_VERSION: &str = "1.11";
diff --git a/src/relay.rs b/src/relay.rs
index 96b9095..fb79575 100644
--- a/src/relay.rs
+++ b/src/relay.rs
@@ -5,7 +5,7 @@
 
 //! RELAY protocol types bundled locally until a relay-rs crate is published.
 //!
-//! These types mirror the RELAY spec v1.10 definitions for Rust (§18.3).
+//! These types mirror the RELAY spec v1.11 definitions for Rust (§18.3).
 
 use std::collections::BTreeMap;
 use std::time::{Duration, Instant};
diff --git a/tests/integration_test.rs b/tests/integration_test.rs
index 18e4874..536a448 100644
--- a/tests/integration_test.rs
+++ b/tests/integration_test.rs
@@ -480,8 +480,8 @@ async fn back_pressure_drop_newest() {
 //fusa:test REQ-LIN-001
 #[test]
 fn spec_version_constant() {
-    assert_eq!(rust_lin::SPEC_VERSION, "1.10");
-    assert_eq!(rust_lin::RELAY_SPEC_VERSION, "1.10");
+    assert_eq!(rust_lin::SPEC_VERSION, "1.11");
+    assert_eq!(rust_lin::RELAY_SPEC_VERSION, "1.11");
 }
 
 // ---------------------------------------------------------------------------