diff --git a/include/llhttp.h b/include/llhttp.h
index b58be5d1..336234c6 100644
--- a/include/llhttp.h
+++ b/include/llhttp.h
@@ -3,7 +3,7 @@
 
 #define LLHTTP_VERSION_MAJOR 6
 #define LLHTTP_VERSION_MINOR 0
-#define LLHTTP_VERSION_PATCH 3
+#define LLHTTP_VERSION_PATCH 4
 
 #ifndef LLHTTP_STRICT_MODE
 # define LLHTTP_STRICT_MODE 0
diff --git a/src/api.c b/src/api.c
index 04e57fd7..1a3bf7b5 100644
--- a/src/api.c
+++ b/src/api.c
@@ -46,7 +46,8 @@ extern int wasm_on_url(llhttp_t* p, const char* at, size_t length);
 extern int wasm_on_status(llhttp_t* p, const char* at, size_t length);
 extern int wasm_on_header_field(llhttp_t* p, const char* at, size_t length);
 extern int wasm_on_header_value(llhttp_t* p, const char* at, size_t length);
-extern int wasm_on_headers_complete(llhttp_t * p);
+extern int wasm_on_headers_complete(llhttp_t * p, int status_code,
+                                    uint8_t upgrade, int should_keep_alive);
 extern int wasm_on_body(llhttp_t* p, const char* at, size_t length);
 extern int wasm_on_message_complete(llhttp_t * p);