diff --git a/llama_cpp/llama_cpp.py b/llama_cpp/llama_cpp.py
index 9c8f778..46aa516 100644
--- a/llama_cpp/llama_cpp.py
+++ b/llama_cpp/llama_cpp.py
@@ -242,8 +242,8 @@ LLAMA_FILE_MAGIC_GGSQ = 0x67677371
 
 # define LLAMA_SESSION_MAGIC   LLAMA_FILE_MAGIC_GGSN
 LLAMA_SESSION_MAGIC = LLAMA_FILE_MAGIC_GGSN
-# define LLAMA_SESSION_VERSION 5
-LLAMA_SESSION_VERSION = 5
+# define LLAMA_SESSION_VERSION 6
+LLAMA_SESSION_VERSION = 6
 
 # define LLAMA_STATE_SEQ_MAGIC   LLAMA_FILE_MAGIC_GGSQ
 LLAMA_STATE_SEQ_MAGIC = LLAMA_FILE_MAGIC_GGSQ
@@ -730,6 +730,7 @@ class llama_model_params(ctypes.Structure):
 #     bool logits_all;  // the llama_decode() call computes all logits, not just the last one (DEPRECATED - set llama_batch.logits instead)
 #     bool embeddings;  // if true, extract embeddings (together with logits)
 #     bool offload_kqv; // whether to offload the KQV ops (including the KV cache) to GPU
+#     bool flash_attn;  // whether to use flash attention
 
 
 #     // Abort callback
@@ -766,6 +767,7 @@ class llama_context_params(ctypes.Structure):
         logits_all (bool): the llama_eval() call computes all logits, not just the last one (DEPRECATED - set llama_batch.logits instead)
         embeddings (bool): if true, extract embeddings (together with logits)
         offload_kqv (bool): whether to offload the KQV ops (including the KV cache) to GPU
+        flash_attn (bool): whether to use flash attention
         abort_callback (ggml_abort_callback): abort callback if it returns true, execution of llama_decode() will be aborted
         abort_callback_data (ctypes.ctypes.c_void_p): data for abort_callback
     """
@@ -795,6 +797,7 @@ class llama_context_params(ctypes.Structure):
         logits_all: bool
         embeddings: bool
         offload_kqv: bool
+        flash_attn: bool
         abort_callback: Callable[[ctypes.c_void_p], bool]
         abort_callback_data: ctypes.c_void_p
 
@@ -823,6 +826,7 @@ class llama_context_params(ctypes.Structure):
         ("logits_all", ctypes.c_bool),
         ("embeddings", ctypes.c_bool),
         ("offload_kqv", ctypes.c_bool),
+        ("flash_attn", ctypes.c_bool),
         ("abort_callback", ggml_abort_callback),
         ("abort_callback_data", ctypes.c_void_p),
     ]
@@ -1615,7 +1619,7 @@ def llama_get_kv_cache_used_cells(ctx: llama_context_p, /) -> int:
     ...
 
 
-# // Clear the KV cache
+# // Clear the KV cache - both cell info is erased and KV data is zeroed
 # LLAMA_API void llama_kv_cache_clear(
 #         struct llama_context * ctx);
 @ctypes_function("llama_kv_cache_clear", [llama_context_p_ctypes], None)
diff --git a/vendor/llama.cpp b/vendor/llama.cpp
index 8843a98..77e15be 160000
--- a/vendor/llama.cpp
+++ b/vendor/llama.cpp
@@ -1 +1 @@
-Subproject commit 8843a98c2ba97a25e93319a104f9ddfaf83ce4c4
+Subproject commit 77e15bec6217a39be59b9cc83d6b9afb6b0d8167