diff --git a/deps/v8/include/v8-version.h b/deps/v8/include/v8-version.h
index 9042d9bc82..b0b42462ed 100644
--- a/deps/v8/include/v8-version.h
+++ b/deps/v8/include/v8-version.h
@@ -11,7 +11,7 @@
 #define V8_MAJOR_VERSION 4
 #define V8_MINOR_VERSION 5
 #define V8_BUILD_NUMBER 103
-#define V8_PATCH_LEVEL 49
+#define V8_PATCH_LEVEL 50
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)
diff --git a/deps/v8/src/bignum.cc b/deps/v8/src/bignum.cc
index e70987a82d..19077c4a15 100644
--- a/deps/v8/src/bignum.cc
+++ b/deps/v8/src/bignum.cc
@@ -70,7 +70,9 @@ static uint64_t ReadUInt64(Vector<const char> buffer,
                            int from,
                            int digits_to_read) {
   uint64_t result = 0;
-  for (int i = from; i < from + digits_to_read; ++i) {
+  int to = from + digits_to_read;
+  
+  for (int i = from; i < to; ++i) {
     int digit = buffer[i] - '0';
     DCHECK(0 <= digit && digit <= 9);
     result = result * 10 + digit;
diff --git a/deps/v8/test/cctest/compiler/test-js-typed-lowering.cc b/deps/v8/test/cctest/compiler/test-js-typed-lowering.cc
index e512de89b2..41fee4e362 100644
--- a/deps/v8/test/cctest/compiler/test-js-typed-lowering.cc
+++ b/deps/v8/test/cctest/compiler/test-js-typed-lowering.cc
@@ -217,10 +217,6 @@ static Type* kNumberTypes[] = {
     Type::OrderedNumber(), Type::PlainNumber(), Type::Number()};
 
 
-static Type* kJSTypes[] = {Type::Undefined(), Type::Null(),   Type::Boolean(),
-                           Type::Number(),    Type::String(), Type::Object()};
-
-
 static Type* I32Type(bool is_signed) {
   return is_signed ? Type::Signed32() : Type::Unsigned32();
 }