diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0b2b5eb31..2cc78bfc7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-- feat: update llama.cpp to ggml-org/llama.cpp@6eab47181
+- feat: update llama.cpp to ggml-org/llama.cpp@e3a74b299
 
 ## [0.3.29]
 
diff --git a/llama_cpp/mtmd_cpp.py b/llama_cpp/mtmd_cpp.py
index 46eb2c879..78f068aa9 100644
--- a/llama_cpp/mtmd_cpp.py
+++ b/llama_cpp/mtmd_cpp.py
@@ -169,6 +169,12 @@ class mtmd_caps(Structure):
     POINTER(c_char_p),
 )
 
+mtmd_helper_post_decode_callback = CFUNCTYPE(
+    c_int,
+    llama_cpp.llama_batch,
+    c_void_p,
+)
+
 
 class mtmd_helper_bitmap_wrapper(Structure):
     """Bitmap wrapper returned by MTMD helper media loaders."""
@@ -860,7 +866,9 @@ def mtmd_helper_eval_chunk_single(
 #                                                 llama_pos n_past,
 #                                                 llama_seq_id seq_id,
 #                                                 int32_t n_batch,
-#                                                 llama_pos * new_n_past);
+#                                                 llama_pos * new_n_past,
+#                                                 mtmd_helper_post_decode_callback callback,
+#                                                 void * user_data);
 @ctypes_function(
     "mtmd_helper_decode_image_chunk",
     [
@@ -872,6 +880,8 @@ def mtmd_helper_eval_chunk_single(
         llama_cpp.llama_seq_id,
         c_int,
         POINTER(llama_cpp.llama_pos),
+        mtmd_helper_post_decode_callback,
+        c_void_p,
     ],
     c_int,
 )
@@ -884,6 +894,8 @@ def mtmd_helper_decode_image_chunk(
     seq_id: llama_cpp.llama_seq_id,
     n_batch: Union[c_int, int],
     new_n_past: "_Pointer[llama_cpp.llama_pos]",
+    callback: Optional[mtmd_helper_post_decode_callback],
+    user_data: c_void_p,
     /,
 ) -> int:
     """Decode a pre-encoded image chunk."""
diff --git a/vendor/llama.cpp b/vendor/llama.cpp
index 6eab47181..e3a74b299 160000
--- a/vendor/llama.cpp
+++ b/vendor/llama.cpp
@@ -1 +1 @@
-Subproject commit 6eab47181cbd3532c88a105682b81b4729ab809b
+Subproject commit e3a74b299085cd00013804f7fca2e03441b2da20