diff --git a/deps/llhttp/.gitignore b/deps/llhttp/.gitignore
new file mode 100644
index 00000000000000..98438a2cd3230c
--- /dev/null
+++ b/deps/llhttp/.gitignore
@@ -0,0 +1 @@
+libllhttp.pc
diff --git a/deps/llhttp/CMakeLists.txt b/deps/llhttp/CMakeLists.txt
index 56f0098c2c5c49..6398043145c879 100644
--- a/deps/llhttp/CMakeLists.txt
+++ b/deps/llhttp/CMakeLists.txt
@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.25.0)
 cmake_policy(SET CMP0069 NEW)
 
-project(llhttp VERSION 9.3.0)
+project(llhttp VERSION 9.3.1)
 include(GNUInstallDirs)
 
 set(CMAKE_C_STANDARD 99)
@@ -24,8 +24,8 @@ endif()
 # Options
 #
 # Generic option
-option(BUILD_SHARED_LIBS "Build shared libraries (.dll/.so)" ON)
-option(BUILD_STATIC_LIBS "Build static libraries (.lib/.a)" OFF)
+option(LLHTTP_BUILD_SHARED_LIBS "Build shared libraries (.dll/.so)" ON)
+option(LLHTTP_BUILD_STATIC_LIBS "Build static libraries (.lib/.a)" OFF)
 
 # Source code
 set(LLHTTP_SOURCES
@@ -80,7 +80,7 @@ function(config_library target)
   )
 endfunction(config_library target)
 
-if(BUILD_SHARED_LIBS)
+if(LLHTTP_BUILD_SHARED_LIBS)
   add_library(llhttp_shared SHARED
       ${llhttp_src}
   )
@@ -88,13 +88,11 @@ if(BUILD_SHARED_LIBS)
   config_library(llhttp_shared)
 endif()
 
-if(BUILD_STATIC_LIBS)
+if(LLHTTP_BUILD_STATIC_LIBS)
   add_library(llhttp_static STATIC
       ${llhttp_src}
   )
-  if(BUILD_SHARED_LIBS)
-    add_library(llhttp::llhttp ALIAS llhttp_shared)
-  else()
+  if(NOT LLHTTP_BUILD_SHARED_LIBS)
     add_library(llhttp::llhttp ALIAS llhttp_static)
   endif()
   config_library(llhttp_static)
@@ -113,6 +111,6 @@ message(STATUS "Project configure summary:")
 message(STATUS "")
 message(STATUS "  CMake build type .................: ${CMAKE_BUILD_TYPE}")
 message(STATUS "  Install prefix ...................: ${CMAKE_INSTALL_PREFIX}")
-message(STATUS "  Build shared library .............: ${BUILD_SHARED_LIBS}")
-message(STATUS "  Build static library .............: ${BUILD_STATIC_LIBS}")
+message(STATUS "  Build shared library .............: ${LLHTTP_BUILD_SHARED_LIBS}")
+message(STATUS "  Build static library .............: ${LLHTTP_BUILD_STATIC_LIBS}")
 message(STATUS "")
diff --git a/deps/llhttp/README.md b/deps/llhttp/README.md
index 70af44ff0f5a16..008b7e622bc962 100644
--- a/deps/llhttp/README.md
+++ b/deps/llhttp/README.md
@@ -435,14 +435,16 @@ If you want to use this library in a CMake project as a static library, you can
 FetchContent_Declare(llhttp
   URL "https://github.com/nodejs/llhttp/archive/refs/tags/release/v8.1.0.tar.gz")
 
-set(BUILD_SHARED_LIBS OFF CACHE INTERNAL "")
-set(BUILD_STATIC_LIBS ON CACHE INTERNAL "")
+set(LLHTTP_BUILD_SHARED_LIBS OFF CACHE INTERNAL "")
+set(LLHTTP_BUILD_STATIC_LIBS ON CACHE INTERNAL "")
 FetchContent_MakeAvailable(llhttp)
 
 # Link with the llhttp_static target
 target_link_libraries(${EXAMPLE_PROJECT_NAME} ${PROJECT_LIBRARIES} llhttp_static ${PROJECT_NAME})
 ```
 
+If using a version prior to 9.3.0, the `LLHTTP_BUILD_SHARED_LIBS` and `LLHTTP_BUILD_STATIC_LIBS` options are known as `BUILD_SHARED_LIBS` and `BUILD_STATIC_LIBS` and should be used instead.
+
 _Note that using the git repo directly (e.g., via a git repo url and tag) will not work with FetchContent_Declare because [CMakeLists.txt](./CMakeLists.txt) requires string replacements (e.g., `_RELEASE_`) before it will build._
 
 ## Building on Windows
diff --git a/deps/llhttp/include/llhttp.h b/deps/llhttp/include/llhttp.h
index 60544596a9942c..194fee8c906ed3 100644
--- a/deps/llhttp/include/llhttp.h
+++ b/deps/llhttp/include/llhttp.h
@@ -4,7 +4,7 @@
 
 #define LLHTTP_VERSION_MAJOR 9
 #define LLHTTP_VERSION_MINOR 3
-#define LLHTTP_VERSION_PATCH 0
+#define LLHTTP_VERSION_PATCH 1
 
 #ifndef INCLUDE_LLHTTP_ITSELF_H_
 #define INCLUDE_LLHTTP_ITSELF_H_
@@ -58,10 +58,8 @@ enum llhttp_errno {
   HPE_OK = 0,
   HPE_INTERNAL = 1,
   HPE_STRICT = 2,
-  HPE_CR_EXPECTED = 25,
   HPE_LF_EXPECTED = 3,
   HPE_UNEXPECTED_CONTENT_LENGTH = 4,
-  HPE_UNEXPECTED_SPACE = 30,
   HPE_CLOSED_CONNECTION = 5,
   HPE_INVALID_METHOD = 6,
   HPE_INVALID_URL = 7,
@@ -82,15 +80,17 @@ enum llhttp_errno {
   HPE_PAUSED_UPGRADE = 22,
   HPE_PAUSED_H2_UPGRADE = 23,
   HPE_USER = 24,
+  HPE_CR_EXPECTED = 25,
   HPE_CB_URL_COMPLETE = 26,
   HPE_CB_STATUS_COMPLETE = 27,
-  HPE_CB_METHOD_COMPLETE = 32,
-  HPE_CB_VERSION_COMPLETE = 33,
   HPE_CB_HEADER_FIELD_COMPLETE = 28,
   HPE_CB_HEADER_VALUE_COMPLETE = 29,
+  HPE_UNEXPECTED_SPACE = 30,
+  HPE_CB_RESET = 31,
+  HPE_CB_METHOD_COMPLETE = 32,
+  HPE_CB_VERSION_COMPLETE = 33,
   HPE_CB_CHUNK_EXTENSION_NAME_COMPLETE = 34,
   HPE_CB_CHUNK_EXTENSION_VALUE_COMPLETE = 35,
-  HPE_CB_RESET = 31,
   HPE_CB_PROTOCOL_COMPLETE = 38
 };
 typedef enum llhttp_errno llhttp_errno_t;
@@ -294,10 +294,8 @@ typedef enum llhttp_status llhttp_status_t;
   XX(0, OK, OK) \
   XX(1, INTERNAL, INTERNAL) \
   XX(2, STRICT, STRICT) \
-  XX(25, CR_EXPECTED, CR_EXPECTED) \
   XX(3, LF_EXPECTED, LF_EXPECTED) \
   XX(4, UNEXPECTED_CONTENT_LENGTH, UNEXPECTED_CONTENT_LENGTH) \
-  XX(30, UNEXPECTED_SPACE, UNEXPECTED_SPACE) \
   XX(5, CLOSED_CONNECTION, CLOSED_CONNECTION) \
   XX(6, INVALID_METHOD, INVALID_METHOD) \
   XX(7, INVALID_URL, INVALID_URL) \
@@ -318,15 +316,17 @@ typedef enum llhttp_status llhttp_status_t;
   XX(22, PAUSED_UPGRADE, PAUSED_UPGRADE) \
   XX(23, PAUSED_H2_UPGRADE, PAUSED_H2_UPGRADE) \
   XX(24, USER, USER) \
+  XX(25, CR_EXPECTED, CR_EXPECTED) \
   XX(26, CB_URL_COMPLETE, CB_URL_COMPLETE) \
   XX(27, CB_STATUS_COMPLETE, CB_STATUS_COMPLETE) \
-  XX(32, CB_METHOD_COMPLETE, CB_METHOD_COMPLETE) \
-  XX(33, CB_VERSION_COMPLETE, CB_VERSION_COMPLETE) \
   XX(28, CB_HEADER_FIELD_COMPLETE, CB_HEADER_FIELD_COMPLETE) \
   XX(29, CB_HEADER_VALUE_COMPLETE, CB_HEADER_VALUE_COMPLETE) \
+  XX(30, UNEXPECTED_SPACE, UNEXPECTED_SPACE) \
+  XX(31, CB_RESET, CB_RESET) \
+  XX(32, CB_METHOD_COMPLETE, CB_METHOD_COMPLETE) \
+  XX(33, CB_VERSION_COMPLETE, CB_VERSION_COMPLETE) \
   XX(34, CB_CHUNK_EXTENSION_NAME_COMPLETE, CB_CHUNK_EXTENSION_NAME_COMPLETE) \
   XX(35, CB_CHUNK_EXTENSION_VALUE_COMPLETE, CB_CHUNK_EXTENSION_VALUE_COMPLETE) \
-  XX(31, CB_RESET, CB_RESET) \
   XX(38, CB_PROTOCOL_COMPLETE, CB_PROTOCOL_COMPLETE) \
 
 
diff --git a/deps/llhttp/src/llhttp.c b/deps/llhttp/src/llhttp.c
index aa4c468209700c..515ba512abbdb0 100644
--- a/deps/llhttp/src/llhttp.c
+++ b/deps/llhttp/src/llhttp.c
@@ -10,7 +10,7 @@
  #endif  /* _MSC_VER */
 #endif  /* __SSE4_2__ */
 
-#ifdef __ARM_NEON__
+#if defined(__ARM_NEON__) || defined(__ARM_NEON)
  #include <arm_neon.h>
 #endif  /* __ARM_NEON__ */
 
@@ -1542,7 +1542,7 @@ static llparse_state_t llhttp__internal__run(
         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1,
         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-        1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+        1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
@@ -2625,7 +2625,7 @@ static llparse_state_t llhttp__internal__run(
         goto s_n_llhttp__internal__n_header_value_otherwise;
       }
       #endif  /* __SSE4_2__ */
-      #ifdef __ARM_NEON__
+      #if defined(__ARM_NEON__) || defined(__ARM_NEON)
       while (endp - p >= 16) {
         uint8x16_t input;
         uint8x16_t single;
@@ -2639,19 +2639,23 @@ static llparse_state_t llhttp__internal__run(
         /* Find first character that does not match `ranges` */
         single = vceqq_u8(input, vdupq_n_u8(0x9));
         mask = single;
-        single = vandq_u16(
+        single = vandq_u8(
           vcgeq_u8(input, vdupq_n_u8(' ')),
           vcleq_u8(input, vdupq_n_u8('~'))
         );
-        mask = vorrq_u16(mask, single);
-        single = vandq_u16(
+        mask = vorrq_u8(mask, single);
+        single = vandq_u8(
           vcgeq_u8(input, vdupq_n_u8(0x80)),
           vcleq_u8(input, vdupq_n_u8(0xff))
         );
-        mask = vorrq_u16(mask, single);
-        narrow = vshrn_n_u16(mask, 4);
+        mask = vorrq_u8(mask, single);
+        narrow = vshrn_n_u16(vreinterpretq_u16_u8(mask), 4);
         match_mask = ~vget_lane_u64(vreinterpret_u64_u8(narrow), 0);
-        match_len = __builtin_ctzll(match_mask) >> 2;
+        if (match_mask == 0) {
+          match_len = 16;
+        } else {
+          match_len = __builtin_ctzll(match_mask) >> 2;
+        }
         if (match_len != 16) {
           p += match_len;
           goto s_n_llhttp__internal__n_header_value_otherwise;