diff --git a/deps/v8/include/v8-version.h b/deps/v8/include/v8-version.h
index 6d5adfc63e4b..37569db5c95a 100644
--- a/deps/v8/include/v8-version.h
+++ b/deps/v8/include/v8-version.h
@@ -11,7 +11,7 @@
 #define V8_MAJOR_VERSION 5
 #define V8_MINOR_VERSION 1
 #define V8_BUILD_NUMBER 281
-#define V8_PATCH_LEVEL 99
+#define V8_PATCH_LEVEL 100
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)
diff --git a/deps/v8/tools/lldb_commands.py b/deps/v8/tools/lldb_commands.py
new file mode 100644
index 000000000000..d8946ee485a2
--- /dev/null
+++ b/deps/v8/tools/lldb_commands.py
@@ -0,0 +1,72 @@
+# Copyright 2017 the V8 project authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import lldb
+import re
+
+def jst(debugger, *args):
+  """Print the current JavaScript stack trace"""
+  target = debugger.GetSelectedTarget()
+  process = target.GetProcess()
+  thread = process.GetSelectedThread()
+  frame = thread.GetSelectedFrame()
+  frame.EvaluateExpression("_v8_internal_Print_StackTrace();")
+  print("")
+
+def jss(debugger, *args):
+  """Skip the jitted stack on x64 to where we entered JS last"""
+  target = debugger.GetSelectedTarget()
+  process = target.GetProcess()
+  thread = process.GetSelectedThread()
+  frame = thread.GetSelectedFrame()
+  js_entry_sp = frame.EvaluateExpression(
+      "v8::internal::Isolate::Current()->thread_local_top()->js_entry_sp_;") \
+       .GetValue()
+  sizeof_void = frame.EvaluateExpression("sizeof(void*)").GetValue()
+  rbp = frame.FindRegister("rbp")
+  rsp = frame.FindRegister("rsp")
+  pc = frame.FindRegister("pc")
+  rbp = js_entry_sp
+  rsp = js_entry_sp + 2 *sizeof_void
+  pc.value = js_entry_sp + sizeof_void
+
+def bta(debugger, *args):
+  """Print stack trace with assertion scopes"""
+  func_name_re = re.compile("([^(<]+)(?:\(.+\))?")
+  assert_re = re.compile(
+      "^v8::internal::Per\w+AssertType::(\w+)_ASSERT, (false|true)>")
+  target = debugger.GetSelectedTarget()
+  process = target.GetProcess()
+  thread = process.GetSelectedThread()
+  frame = thread.GetSelectedFrame()
+  for frame in thread:
+    functionSignature = frame.GetDisplayFunctionName()
+    if functionSignature is None:
+      continue
+    functionName = func_name_re.match(functionSignature)
+    line = frame.GetLineEntry().GetLine()
+    sourceFile = frame.GetLineEntry().GetFileSpec().GetFilename()
+    if line:
+      sourceFile = sourceFile + ":" + str(line)
+
+    if sourceFile is None:
+      sourceFile = ""
+    print("[%-2s] %-60s %-40s" % (frame.GetFrameID(),
+                                  functionName.group(1),
+                                  sourceFile))
+    match = assert_re.match(str(functionSignature))
+    if match:
+      if match.group(3) == "false":
+        prefix = "Disallow"
+        color = "\033[91m"
+      else:
+        prefix = "Allow"
+        color = "\033[92m"
+      print("%s -> %s %s (%s)\033[0m" % (
+          color, prefix, match.group(2), match.group(1)))
+
+def __lldb_init_module (debugger, dict):
+  debugger.HandleCommand('command script add -f lldb_commands.jst jst')
+  debugger.HandleCommand('command script add -f lldb_commands.jss jss')
+  debugger.HandleCommand('command script add -f lldb_commands.bta bta')
diff --git a/deps/v8/tools/lldbinit b/deps/v8/tools/lldbinit
new file mode 100644
index 000000000000..b4567a87bcf7
--- /dev/null
+++ b/deps/v8/tools/lldbinit
@@ -0,0 +1,26 @@
+# Copyright 2017 the V8 project authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Print HeapObjects.
+command regex -h 'Print a v8 JavaScript object' job 's/(.+)/expr -- '_v8_internal_Print_Object((void*)(%1))/'
+
+# Print v8::Local handle value.
+command regex -h 'Print content of a v8::Local handle' jlh 's/(.+)/expr -- '_v8_internal_Print_Object(*(v8::internal::Object**)(*%1))/'
+
+# Print Code objects containing given PC.
+command regex -h 'Print a v8 Code object from an internal code address' jco 's/(.+)/expr -- '_v8_internal_Print_Code((void*)(*%1))/'
+
+# Print FeedbackVector
+command regex -h 'Print a v8 FeedbackVector object' jfv 's/(.+)/expr -- '_v8_internal_Print_FeedbackVector((void*)(%1))/'
+
+# Print DescriptorArray.
+command regex -h 'Print a v8 DescriptorArray object' jda 's/(.+)/expr -- '_v8_internal_Print_DescriptorArray((void*)(%1))/'
+
+# Print LayoutDescriptor.
+command regex -h 'Print a v8 LayoutDescriptor object' jld 's/(.+)/expr -- '_v8_internal_Print_LayoutDescriptor((void*)(%1))/'
+
+# Print TransitionArray.
+command regex -h 'Print a v8 TransitionArray object' jta 's/(.+)/expr -- '_v8_internal_Print_TransitionArray((void*)(%1))/'
+
+command script import ~/lldb_commands.py
diff --git a/tools/install.py b/tools/install.py
index d1100352c6a4..ea55c19ff41f 100755
--- a/tools/install.py
+++ b/tools/install.py
@@ -133,6 +133,8 @@ def files(action):
   action(['src/node.stp'], 'share/systemtap/tapset/')
 
   action(['deps/v8/tools/gdbinit'], 'share/doc/node/')
+  action(['deps/v8/tools/lldbinit'], 'share/doc/node/')
+  action(['deps/v8/tools/lldb_commands.py'], 'share/doc/node/')
 
   if 'freebsd' in sys.platform or 'openbsd' in sys.platform:
     action(['doc/node.1'], 'man/man1/')