diff --git a/common.gypi b/common.gypi
index 876b0f14566b5d..d5e184184dc3b0 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.13',
+    'v8_embedder_string': '-node.14',
 
     ##### V8 defaults for Node.js #####
 
diff --git a/deps/v8/src/common/message-template.h b/deps/v8/src/common/message-template.h
index 09a387c5277be7..b0684cffcc4a55 100644
--- a/deps/v8/src/common/message-template.h
+++ b/deps/v8/src/common/message-template.h
@@ -114,6 +114,9 @@ namespace internal {
   T(IllegalInvocation, "Illegal invocation")                                   \
   T(ImmutablePrototypeSet,                                                     \
     "Immutable prototype object '%' cannot have their prototype set")          \
+  T(ImportAssertDeprecated,                                                    \
+    "'assert' is deprecated in import statements and support will be removed " \
+    "in %; use 'with' instead")                                                \
   T(ImportAssertionDuplicateKey, "Import assertion has duplicate key '%'")     \
   T(ImportCallNotNewExpression, "Cannot use new with import")                  \
   T(ImportOutsideModule, "Cannot use import statement outside a module")       \
diff --git a/deps/v8/src/parsing/parser.cc b/deps/v8/src/parsing/parser.cc
index da16f85234d7c0..144492cb071303 100644
--- a/deps/v8/src/parsing/parser.cc
+++ b/deps/v8/src/parsing/parser.cc
@@ -1400,6 +1400,9 @@ ImportAssertions* Parser::ParseImportAssertClause() {
     //
     // TODO(v8:13856): Remove once decision is made to unship 'assert' or keep.
     ++use_counts_[v8::Isolate::kImportAssertionDeprecatedSyntax];
+    info_->pending_error_handler()->ReportWarningAt(
+        position(), end_position(), MessageTemplate::kImportAssertDeprecated,
+        "12.6");
   } else {
     return import_assertions;
   }
diff --git a/deps/v8/test/message/fail/modules-import-assertions-fail-2.out b/deps/v8/test/message/fail/modules-import-assertions-fail-2.out
index 47ac5621187d97..6f2a0f04d6a959 100644
--- a/deps/v8/test/message/fail/modules-import-assertions-fail-2.out
+++ b/deps/v8/test/message/fail/modules-import-assertions-fail-2.out
@@ -1,4 +1,5 @@
+*%(basename)s:9: 'assert' is deprecated in import statements and support will be removed in 12.6; use 'with' instead
 undefined:1: SyntaxError: Unexpected token '/', "// Copyrig"... is not valid JSON
 // Copyright 2021 the V8 project authors. All rights reserved.
 ^
-SyntaxError: Unexpected token '/', "// Copyrig"... is not valid JSON
\ No newline at end of file
+SyntaxError: Unexpected token '/', "// Copyrig"... is not valid JSON
diff --git a/deps/v8/test/unittests/interpreter/bytecode_expectations/PrivateAccessorAccess.golden b/deps/v8/test/unittests/interpreter/bytecode_expectations/PrivateAccessorAccess.golden
index 0013dcf6bb506d..24dc4757f499a0 100644
--- a/deps/v8/test/unittests/interpreter/bytecode_expectations/PrivateAccessorAccess.golden
+++ b/deps/v8/test/unittests/interpreter/bytecode_expectations/PrivateAccessorAccess.golden
@@ -83,7 +83,7 @@ bytecodes: [
   /*   48 E> */ B(DefineKeyedOwnProperty), R(this), R(0), U8(0), U8(0),
   /*   53 S> */ B(LdaImmutableCurrentContextSlot), U8(3),
   /*   58 E> */ B(GetKeyedProperty), R(this), U8(2),
-                B(Wide), B(LdaSmi), I16(316),
+                B(Wide), B(LdaSmi), I16(317),
                 B(Star2),
                 B(LdaConstant), U8(0),
                 B(Star3),
@@ -115,7 +115,7 @@ bytecodes: [
   /*   41 E> */ B(DefineKeyedOwnProperty), R(this), R(0), U8(0), U8(0),
   /*   46 S> */ B(LdaImmutableCurrentContextSlot), U8(3),
   /*   51 E> */ B(GetKeyedProperty), R(this), U8(2),
-                B(Wide), B(LdaSmi), I16(315),
+                B(Wide), B(LdaSmi), I16(316),
                 B(Star2),
                 B(LdaConstant), U8(0),
                 B(Star3),
@@ -149,7 +149,7 @@ bytecodes: [
                 B(Star2),
                 B(LdaImmutableCurrentContextSlot), U8(3),
   /*   58 E> */ B(GetKeyedProperty), R(this), U8(2),
-                B(Wide), B(LdaSmi), I16(316),
+                B(Wide), B(LdaSmi), I16(317),
                 B(Star3),
                 B(LdaConstant), U8(0),
                 B(Star4),
@@ -181,7 +181,7 @@ bytecodes: [
   /*   41 E> */ B(DefineKeyedOwnProperty), R(this), R(0), U8(0), U8(0),
   /*   46 S> */ B(LdaImmutableCurrentContextSlot), U8(3),
   /*   51 E> */ B(GetKeyedProperty), R(this), U8(2),
-                B(Wide), B(LdaSmi), I16(315),
+                B(Wide), B(LdaSmi), I16(316),
                 B(Star2),
                 B(LdaConstant), U8(0),
                 B(Star3),
diff --git a/deps/v8/test/unittests/interpreter/bytecode_expectations/PrivateMethodAccess.golden b/deps/v8/test/unittests/interpreter/bytecode_expectations/PrivateMethodAccess.golden
index bd17ad57ef5a33..12add0b75a3b98 100644
--- a/deps/v8/test/unittests/interpreter/bytecode_expectations/PrivateMethodAccess.golden
+++ b/deps/v8/test/unittests/interpreter/bytecode_expectations/PrivateMethodAccess.golden
@@ -58,7 +58,7 @@ bytecodes: [
                 B(Star2),
                 B(LdaImmutableCurrentContextSlot), U8(3),
   /*   54 E> */ B(GetKeyedProperty), R(this), U8(2),
-                B(Wide), B(LdaSmi), I16(314),
+                B(Wide), B(LdaSmi), I16(315),
                 B(Star3),
                 B(LdaConstant), U8(0),
                 B(Star4),
@@ -91,7 +91,7 @@ bytecodes: [
   /*   44 E> */ B(DefineKeyedOwnProperty), R(this), R(0), U8(0), U8(0),
   /*   49 S> */ B(LdaImmutableCurrentContextSlot), U8(3),
   /*   54 E> */ B(GetKeyedProperty), R(this), U8(2),
-                B(Wide), B(LdaSmi), I16(314),
+                B(Wide), B(LdaSmi), I16(315),
                 B(Star2),
                 B(LdaConstant), U8(0),
                 B(Star3),
diff --git a/deps/v8/test/unittests/interpreter/bytecode_expectations/StaticPrivateMethodAccess.golden b/deps/v8/test/unittests/interpreter/bytecode_expectations/StaticPrivateMethodAccess.golden
index c37ec6f1119642..2a3e93ffc306dc 100644
--- a/deps/v8/test/unittests/interpreter/bytecode_expectations/StaticPrivateMethodAccess.golden
+++ b/deps/v8/test/unittests/interpreter/bytecode_expectations/StaticPrivateMethodAccess.golden
@@ -24,7 +24,7 @@ bytecodes: [
                 B(TestReferenceEqual), R(this),
                 B(Mov), R(this), R(1),
                 B(JumpIfTrue), U8(16),
-                B(Wide), B(LdaSmi), I16(308),
+                B(Wide), B(LdaSmi), I16(309),
                 B(Star2),
                 B(LdaConstant), U8(0),
                 B(Star3),
@@ -61,13 +61,13 @@ bytecodes: [
                 B(TestReferenceEqual), R(this),
                 B(Mov), R(this), R(0),
                 B(JumpIfTrue), U8(16),
-                B(Wide), B(LdaSmi), I16(308),
+                B(Wide), B(LdaSmi), I16(309),
                 B(Star2),
                 B(LdaConstant), U8(0),
                 B(Star3),
   /*   61 E> */ B(CallRuntime), U16(Runtime::kNewTypeError), R(2), U8(2),
                 B(Throw),
-                B(Wide), B(LdaSmi), I16(314),
+                B(Wide), B(LdaSmi), I16(315),
                 B(Star2),
                 B(LdaConstant), U8(1),
                 B(Star3),
@@ -99,13 +99,13 @@ bytecodes: [
                 B(TestReferenceEqual), R(this),
                 B(Mov), R(this), R(0),
                 B(JumpIfTrue), U8(16),
-                B(Wide), B(LdaSmi), I16(308),
+                B(Wide), B(LdaSmi), I16(309),
                 B(Star1),
                 B(LdaConstant), U8(0),
                 B(Star2),
   /*   61 E> */ B(CallRuntime), U16(Runtime::kNewTypeError), R(1), U8(2),
                 B(Throw),
-                B(Wide), B(LdaSmi), I16(314),
+                B(Wide), B(LdaSmi), I16(315),
                 B(Star1),
                 B(LdaConstant), U8(1),
                 B(Star2),
@@ -145,7 +145,7 @@ bytecodes: [
                 B(TestReferenceEqual), R(this),
                 B(Mov), R(this), R(0),
                 B(JumpIfTrue), U8(16),
-                B(Wide), B(LdaSmi), I16(308),
+                B(Wide), B(LdaSmi), I16(309),
                 B(Star2),
                 B(LdaConstant), U8(0),
                 B(Star3),
@@ -167,7 +167,7 @@ bytecodes: [
                 B(TestReferenceEqual), R(this),
                 B(Mov), R(this), R(0),
                 B(JumpIfTrue), U8(16),
-                B(Wide), B(LdaSmi), I16(308),
+                B(Wide), B(LdaSmi), I16(309),
                 B(Star3),
                 B(LdaConstant), U8(0),
                 B(Star4),
@@ -182,7 +182,7 @@ bytecodes: [
                 B(TestReferenceEqual), R(this),
                 B(Mov), R(this), R(0),
                 B(JumpIfTrue), U8(16),
-                B(Wide), B(LdaSmi), I16(308),
+                B(Wide), B(LdaSmi), I16(309),
                 B(Star2),
                 B(LdaConstant), U8(0),
                 B(Star3),
@@ -216,13 +216,13 @@ bytecodes: [
                 B(TestReferenceEqual), R(this),
                 B(Mov), R(this), R(0),
                 B(JumpIfTrue), U8(16),
-                B(Wide), B(LdaSmi), I16(308),
+                B(Wide), B(LdaSmi), I16(309),
                 B(Star1),
                 B(LdaConstant), U8(0),
                 B(Star2),
   /*   65 E> */ B(CallRuntime), U16(Runtime::kNewTypeError), R(1), U8(2),
                 B(Throw),
-                B(Wide), B(LdaSmi), I16(316),
+                B(Wide), B(LdaSmi), I16(317),
                 B(Star1),
                 B(LdaConstant), U8(1),
                 B(Star2),
@@ -253,13 +253,13 @@ bytecodes: [
                 B(TestReferenceEqual), R(this),
                 B(Mov), R(this), R(0),
                 B(JumpIfTrue), U8(16),
-                B(Wide), B(LdaSmi), I16(308),
+                B(Wide), B(LdaSmi), I16(309),
                 B(Star1),
                 B(LdaConstant), U8(0),
                 B(Star2),
   /*   58 E> */ B(CallRuntime), U16(Runtime::kNewTypeError), R(1), U8(2),
                 B(Throw),
-                B(Wide), B(LdaSmi), I16(315),
+                B(Wide), B(LdaSmi), I16(316),
                 B(Star1),
                 B(LdaConstant), U8(1),
                 B(Star2),
@@ -292,13 +292,13 @@ bytecodes: [
                 B(TestReferenceEqual), R(this),
                 B(Mov), R(this), R(0),
                 B(JumpIfTrue), U8(16),
-                B(Wide), B(LdaSmi), I16(308),
+                B(Wide), B(LdaSmi), I16(309),
                 B(Star2),
                 B(LdaConstant), U8(0),
                 B(Star3),
   /*   65 E> */ B(CallRuntime), U16(Runtime::kNewTypeError), R(2), U8(2),
                 B(Throw),
-                B(Wide), B(LdaSmi), I16(316),
+                B(Wide), B(LdaSmi), I16(317),
                 B(Star2),
                 B(LdaConstant), U8(1),
                 B(Star3),
@@ -327,7 +327,7 @@ bytecode array length: 19
 bytecodes: [
   /*   46 S> */ B(LdaImmutableCurrentContextSlot), U8(3),
   /*   51 E> */ B(GetKeyedProperty), R(this), U8(0),
-                B(Wide), B(LdaSmi), I16(315),
+                B(Wide), B(LdaSmi), I16(316),
                 B(Star1),
                 B(LdaConstant), U8(0),
                 B(Star2),