diff --git a/common.gypi b/common.gypi
index 22ddea26774b22..5380757bf954ae 100644
--- a/common.gypi
+++ b/common.gypi
@@ -36,7 +36,7 @@
 
     # Reset this number to 0 on major V8 upgrades.
     # Increment by one for each non-official patch applied to deps/v8.
-    'v8_embedder_string': '-node.44',
+    'v8_embedder_string': '-node.45',
 
     ##### V8 defaults for Node.js #####
 
diff --git a/deps/v8/src/regexp/regexp-bytecode-generator-inl.h b/deps/v8/src/regexp/regexp-bytecode-generator-inl.h
index bd906fea153a21..2a6ffec9297f32 100644
--- a/deps/v8/src/regexp/regexp-bytecode-generator-inl.h
+++ b/deps/v8/src/regexp/regexp-bytecode-generator-inl.h
@@ -14,13 +14,13 @@ namespace v8 {
 namespace internal {
 
 void RegExpBytecodeGenerator::Emit(uint32_t byte, uint32_t twenty_four_bits) {
-  uint32_t word = ((twenty_four_bits << BYTECODE_SHIFT) | byte);
-  DCHECK(pc_ <= buffer_.length());
-  if (pc_ + 3 >= buffer_.length()) {
-    Expand();
-  }
-  *reinterpret_cast<uint32_t*>(buffer_.begin() + pc_) = word;
-  pc_ += 4;
+  DCHECK(is_uint24(twenty_four_bits));
+  Emit32((twenty_four_bits << BYTECODE_SHIFT) | byte);
+}
+
+void RegExpBytecodeGenerator::Emit(uint32_t byte, int32_t twenty_four_bits) {
+  DCHECK(is_int24(twenty_four_bits));
+  Emit32((static_cast<uint32_t>(twenty_four_bits) << BYTECODE_SHIFT) | byte);
 }
 
 void RegExpBytecodeGenerator::Emit16(uint32_t word) {
diff --git a/deps/v8/src/regexp/regexp-bytecode-generator.cc b/deps/v8/src/regexp/regexp-bytecode-generator.cc
index e82b67b530a707..16f693c6a03999 100644
--- a/deps/v8/src/regexp/regexp-bytecode-generator.cc
+++ b/deps/v8/src/regexp/regexp-bytecode-generator.cc
@@ -161,8 +161,10 @@ bool RegExpBytecodeGenerator::Succeed() {
 void RegExpBytecodeGenerator::Fail() { Emit(BC_FAIL, 0); }
 
 void RegExpBytecodeGenerator::AdvanceCurrentPosition(int by) {
-  DCHECK_LE(kMinCPOffset, by);
-  DCHECK_GE(kMaxCPOffset, by);
+  // TODO(chromium:1166138): Turn back into DCHECKs once the underlying issue
+  // is fixed.
+  CHECK_LE(kMinCPOffset, by);
+  CHECK_GE(kMaxCPOffset, by);
   advance_current_start_ = pc_;
   advance_current_offset_ = by;
   Emit(BC_ADVANCE_CP, by);
diff --git a/deps/v8/src/regexp/regexp-bytecode-generator.h b/deps/v8/src/regexp/regexp-bytecode-generator.h
index fdb9b468619d60..0b4656f6633ad0 100644
--- a/deps/v8/src/regexp/regexp-bytecode-generator.h
+++ b/deps/v8/src/regexp/regexp-bytecode-generator.h
@@ -85,6 +85,7 @@ class V8_EXPORT_PRIVATE RegExpBytecodeGenerator : public RegExpMacroAssembler {
   inline void Emit16(uint32_t x);
   inline void Emit8(uint32_t x);
   inline void Emit(uint32_t bc, uint32_t arg);
+  inline void Emit(uint32_t bc, int32_t arg);
   // Bytecode buffer.
   int length();
   void Copy(byte* a);
diff --git a/deps/v8/test/mjsunit/mjsunit.status b/deps/v8/test/mjsunit/mjsunit.status
index 42f0b970d3644f..1fb864e04a86fe 100644
--- a/deps/v8/test/mjsunit/mjsunit.status
+++ b/deps/v8/test/mjsunit/mjsunit.status
@@ -73,6 +73,9 @@
   # Enable once multi-byte prefixed opcodes are correctly handled
   'regress/wasm/regress-1065599': [SKIP],
 
+  # https://crbug.com/1166138
+  'regress/regress-1166138': SKIP,
+
   ##############################################################################
   # Tests where variants make no sense.
   'd8/enable-tracing': [PASS, NO_VARIANTS],
diff --git a/deps/v8/test/mjsunit/regress/regress-1166138.js b/deps/v8/test/mjsunit/regress/regress-1166138.js
new file mode 100644
index 00000000000000..b1a5d6b7bb8651
--- /dev/null
+++ b/deps/v8/test/mjsunit/regress/regress-1166138.js
@@ -0,0 +1,7 @@
+// Copyright 2020 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.
+
+let badregexp =  "(?:" +  " ".repeat(32768*2)+  ")*";
+reg = RegExp(badregexp);
+reg.test()