diff --git a/backend/go/vllm-cpp/Makefile b/backend/go/vllm-cpp/Makefile
index c19aeaa8e..a44745b1a 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?=5058268d7c6308d4b3bca731b79fce0399c1672e
+VLLM_CPP_VERSION?=d4738d241271b4d10134a6499f97337f20fcf8ce
 
 # 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 a6f1935d3..1f432ea39 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 v26).
+// purego bindings for the vllm.cpp stable C ABI (include/vllm.h, ABI v27).
 //
 // 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