diff --git a/backend/go/vllm-cpp/Makefile b/backend/go/vllm-cpp/Makefile
index f01b9a77f..cc989aabc 100644
--- a/backend/go/vllm-cpp/Makefile
+++ b/backend/go/vllm-cpp/Makefile
@@ -11,7 +11,7 @@ JOBS?=$(shell nproc --ignore=1 2>/dev/null || sysctl -n hw.ncpu 2>/dev/null || e
 
 # vllm.cpp version
 VLLM_CPP_REPO?=https://github.com/mudler/vllm.cpp
-VLLM_CPP_VERSION?=4880c5715f36445a30bd39d3349a06dc96085a11
+VLLM_CPP_VERSION?=76f2a6d84e41cc9a593146a9a958f63645542731
 
 # MLX GEMM provider (darwin/metal only; see the metal branch below for why).
 # Consumed as the prebuilt pip wheel: building MLX from source needs `xcrun
diff --git a/backend/go/vllm-cpp/govllmcpp.go b/backend/go/vllm-cpp/govllmcpp.go
index 318b2d375..b880105af 100644
--- a/backend/go/vllm-cpp/govllmcpp.go
+++ b/backend/go/vllm-cpp/govllmcpp.go
@@ -1,6 +1,6 @@
 package main
 
-// purego bindings for the vllm.cpp stable C ABI (include/vllm.h, ABI v20).
+// purego bindings for the vllm.cpp stable C ABI (include/vllm.h, ABI v21).
 //
 // The structs below are hand-mirrored PODs of the C declarations, with
 // explicit padding so the Go layout matches the C layout on linux/darwin
@@ -21,7 +21,7 @@ import (
 // the header of the VLLM_CPP_VERSION pinned in the Makefile: the build checks
 // the two against each other, because a mismatch is only caught at runtime by
 // registerLib, where it takes the backend down on every load (issue #11379).
-const abiVersion = 20
+const abiVersion = 21
 
 // The ABI's tri-state toggles (enable_prefix_caching ABI v7,
 // enable_jump_forward ABI v10) share one encoding: 0 is NOT "off", it is
diff --git a/backend/go/vllm-cpp/patches/0001-fix-qwen35-unused-lambda-capture.patch b/backend/go/vllm-cpp/patches/0001-fix-qwen35-unused-lambda-capture.patch
deleted file mode 100644
index cb3e97053..000000000
--- a/backend/go/vllm-cpp/patches/0001-fix-qwen35-unused-lambda-capture.patch
+++ /dev/null
@@ -1,26 +0,0 @@
-From: LocalAI maintainers
-Subject: [PATCH] fix(qwen3.5): drop redundant kRequired capture
-
-Apple Clang diagnoses the capture of this namespace-scope reference as unused,
-and vllm.cpp promotes that warning to an error. The lambda can access the name
-without a capture.
-
-Retire this patch when the pinned vllm.cpp revision no longer captures
-kRequired in the qwen3.5 refusal lambda.
----
- src/vllm/model_executor/models/qwen3_5_weights.cpp | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
-
-diff --git a/src/vllm/model_executor/models/qwen3_5_weights.cpp b/src/vllm/model_executor/models/qwen3_5_weights.cpp
-index 7150443..7de1b9d 100644
---- a/src/vllm/model_executor/models/qwen3_5_weights.cpp
-+++ b/src/vllm/model_executor/models/qwen3_5_weights.cpp
-@@ -950,7 +950,7 @@ void CheckMoeQuantLayoutSupported(const std::vector<std::string>& names,
-   // ...and the three NON-routed components, refused by the dtype the probe
-   // RESOLVED rather than discovered as a complaint from inside a reader (#490).
-   // Each of these already failed before #864; naming it is the whole change.
--  const auto refuse = [&kRequired](const char* what, MoeProjDtype got,
-+  const auto refuse = [](const char* what, MoeProjDtype got,
-                                    const char* supported) {
-     VT_CHECK(false, std::string("qwen3_5 weights: a ") +
-                         MoeProjDtypeName(got) + " " + what +
diff --git a/backend/go/vllm-cpp/vllmcpp_test.go b/backend/go/vllm-cpp/vllmcpp_test.go
index 9fd8c321c..681ca4d4e 100644
--- a/backend/go/vllm-cpp/vllmcpp_test.go
+++ b/backend/go/vllm-cpp/vllmcpp_test.go
@@ -16,7 +16,7 @@ func TestVllmCpp(t *testing.T) {
 	RunSpecs(t, "vllm-cpp suite")
 }
 
-// The Go POD mirrors must match the C struct layout of vllm.h (ABI v20)
+// The Go POD mirrors must match the C struct layout of vllm.h (ABI v21)
 // byte-for-byte: these offsets are the C offsets on LP64 (linux/darwin
 // amd64+arm64). A failure here means govllmcpp.go drifted from vllm.h.
 var _ = Describe("C ABI struct mirrors", func() {
@@ -24,7 +24,7 @@ var _ = Describe("C ABI struct mirrors", func() {
 		// VLLM_ABI_VERSION in the vllm.h of VLLM_CPP_VERSION (Makefile).
 		// Moving the pin past this without growing the mirrors below ships a
 		// backend that refuses every load at startup (issue #11379).
-		Expect(abiVersion).To(Equal(20))
+		Expect(abiVersion).To(Equal(21))
 	})
 
 	It("cModelParams matches vllm_model_params", func() {