diff --git a/deps/v8/src/compiler/turboshaft/string-escape-analysis-reducer.h b/deps/v8/src/compiler/turboshaft/string-escape-analysis-reducer.h
index 95fb93d00f036e..5460312001d7fd 100644
--- a/deps/v8/src/compiler/turboshaft/string-escape-analysis-reducer.h
+++ b/deps/v8/src/compiler/turboshaft/string-escape-analysis-reducer.h
@@ -149,7 +149,7 @@ class StringEscapeAnalysisReducer : public Next {
     }
 
    private:
-    ElidedStringPart(Kind kind, V<String> index) : data(index), kind(kind) {}
+    ElidedStringPart(Kind kind, V<String> index) : data{index}, kind(kind) {}
   };
 
   void Analyze() {
diff --git a/deps/v8/src/heap/heap-visitor-inl.h b/deps/v8/src/heap/heap-visitor-inl.h
index 8b1604d321fb6d..ed635fa6f36379 100644
--- a/deps/v8/src/heap/heap-visitor-inl.h
+++ b/deps/v8/src/heap/heap-visitor-inl.h
@@ -93,26 +93,23 @@ Tagged<T> HeapVisitor<ConcreteVisitor>::Cast(Tagged<HeapObject> object,
 }
 
 template <typename ConcreteVisitor>
-size_t HeapVisitor<ConcreteVisitor>::Visit(Tagged<HeapObject> object)
-  requires(!ConcreteVisitor::UsePrecomputedObjectSize())
-{
+template <typename T, typename>
+size_t HeapVisitor<ConcreteVisitor>::Visit(Tagged<HeapObject> object) {
   return Visit(object->map(cage_base()), object);
 }
 
 template <typename ConcreteVisitor>
+template <typename T, typename>
 size_t HeapVisitor<ConcreteVisitor>::Visit(Tagged<Map> map,
-                                           Tagged<HeapObject> object)
-  requires(!ConcreteVisitor::UsePrecomputedObjectSize())
-{
+                                           Tagged<HeapObject> object) {
   return Visit(map, object, MaybeObjectSize());
 }
 
 template <typename ConcreteVisitor>
+template <typename T, typename>
 size_t HeapVisitor<ConcreteVisitor>::Visit(Tagged<Map> map,
                                            Tagged<HeapObject> object,
-                                           int object_size)
-  requires(ConcreteVisitor::UsePrecomputedObjectSize())
-{
+                                           int object_size) {
   return Visit(map, object, MaybeObjectSize(object_size));
 }
 
diff --git a/deps/v8/src/heap/heap-visitor.h b/deps/v8/src/heap/heap-visitor.h
index 2ee724764f6089..d324b3bb869b85 100644
--- a/deps/v8/src/heap/heap-visitor.h
+++ b/deps/v8/src/heap/heap-visitor.h
@@ -196,15 +196,18 @@ class HeapVisitor : public ObjectVisitorWithCageBases {
   inline explicit HeapVisitor(Isolate* isolate);
   inline explicit HeapVisitor(Heap* heap);
 
-  V8_INLINE size_t Visit(Tagged<HeapObject> object)
-    requires(!ConcreteVisitor::UsePrecomputedObjectSize());
+  template <typename T = ConcreteVisitor,
+            typename = std::enable_if_t<!T::UsePrecomputedObjectSize()>>
+  V8_INLINE size_t Visit(Tagged<HeapObject> object);
 
-  V8_INLINE size_t Visit(Tagged<Map> map, Tagged<HeapObject> object)
-    requires(!ConcreteVisitor::UsePrecomputedObjectSize());
+  template <typename T = ConcreteVisitor,
+            typename = std::enable_if_t<!T::UsePrecomputedObjectSize()>>
+  V8_INLINE size_t Visit(Tagged<Map> map, Tagged<HeapObject> object);
 
+  template <typename T = ConcreteVisitor,
+            typename = std::enable_if_t<T::UsePrecomputedObjectSize()>>
   V8_INLINE size_t Visit(Tagged<Map> map, Tagged<HeapObject> object,
-                         int object_size)
-    requires(ConcreteVisitor::UsePrecomputedObjectSize());
+                         int object_size);
 
  protected:
   V8_INLINE size_t Visit(Tagged<Map> map, Tagged<HeapObject> object,
diff --git a/deps/v8/src/heap/mark-compact.cc b/deps/v8/src/heap/mark-compact.cc
index e668710f7fe5f7..876c32e87a864e 100644
--- a/deps/v8/src/heap/mark-compact.cc
+++ b/deps/v8/src/heap/mark-compact.cc
@@ -3862,7 +3862,7 @@ void MarkCompactCollector::ClearWeakCollections() {
 
 template <typename TObjectAndSlot, typename TMaybeSlot>
 void MarkCompactCollector::ClearWeakReferences(
-    WeakObjects::WeakObjectWorklist<TObjectAndSlot>::Local& worklist,
+    typename WeakObjects::WeakObjectWorklist<TObjectAndSlot>::Local& worklist,
     Tagged<HeapObjectReference> cleared_weak_ref) {
   TObjectAndSlot slot;
   while (worklist.Pop(&slot)) {
diff --git a/deps/v8/src/heap/mark-compact.h b/deps/v8/src/heap/mark-compact.h
index 60e0895e6d7816..9495f8e98ac659 100644
--- a/deps/v8/src/heap/mark-compact.h
+++ b/deps/v8/src/heap/mark-compact.h
@@ -339,7 +339,7 @@ class MarkCompactCollector final {
   // Common implementation of the above two.
   template <typename TObjectAndSlot, typename TMaybeSlot>
   void ClearWeakReferences(
-      WeakObjects::WeakObjectWorklist<TObjectAndSlot>::Local& worklist,
+      typename WeakObjects::WeakObjectWorklist<TObjectAndSlot>::Local& worklist,
       Tagged<HeapObjectReference> cleared_weak_ref);
 
   // Goes through the list of encountered non-trivial weak references and
diff --git a/deps/v8/src/json/json-stringifier.cc b/deps/v8/src/json/json-stringifier.cc
index 383147abbc3473..af805df09e5372 100644
--- a/deps/v8/src/json/json-stringifier.cc
+++ b/deps/v8/src/json/json-stringifier.cc
@@ -2072,7 +2072,7 @@ template <typename Char>
 template <typename StringT>
 FastJsonStringifierResult FastJsonStringifier<Char>::SerializeObjectKey(
     Tagged<String> obj, bool comma, const DisallowGarbageCollection& no_gc) {
-  using StringChar = StringT::Char;
+  using StringChar = typename StringT::Char;
   if constexpr (is_one_byte && sizeof(StringChar) == 2) {
     return CHANGE_ENCODING;
   } else {
@@ -2098,7 +2098,7 @@ template <typename StringT, bool deferred_key>
 FastJsonStringifierResult FastJsonStringifier<Char>::SerializeString(
     Tagged<HeapObject> obj, bool comma, Tagged<String> key,
     const DisallowGarbageCollection& no_gc) {
-  using StringChar = StringT::Char;
+  using StringChar = typename StringT::Char;
   if constexpr (is_one_byte && sizeof(StringChar) == 2) {
     return CHANGE_ENCODING;
   } else {
@@ -2277,36 +2277,39 @@ FastJsonStringifierResult FastJsonStringifier<Char>::SerializeJSObject(
           break;
         case UNDEFINED:
           break;
-        case UNCHANGED:
-          stack_.emplace_back(ContinuationRecord::kObject, obj,
-                              i.as_uint32() + 1);
+        case UNCHANGED: {
+          ContinuationRecord rec1{ContinuationRecord::kObject, obj, i.as_uint32() + 1};
+          stack_.emplace_back(std::move(rec1));
           // property can be an object or array. We don't need to distinguish
           // as index is 0 anyways.
-          stack_.emplace_back(ContinuationRecord::kObject, property, 0);
+          ContinuationRecord rec2{ContinuationRecord::kObject, property, 0};
+          stack_.emplace_back(std::move(rec2));
           result = SerializeObjectKey(key_name, comma, no_gc);
           if constexpr (is_one_byte) {
             if (V8_UNLIKELY(result != SUCCESS)) {
               DCHECK_EQ(result, CHANGE_ENCODING);
-              stack_.emplace_back(ContinuationRecord::kObjectKey, key_name,
-                                  comma);
+              ContinuationRecord rec3{ContinuationRecord::kObjectKey, key_name, comma};
+              stack_.emplace_back(std::move(rec3));
               return result;
             }
           }
           return result;
-        case CHANGE_ENCODING:
+        }
+        case CHANGE_ENCODING: {
           DCHECK(is_one_byte);
-          stack_.emplace_back(ContinuationRecord::kObject, obj,
-                              i.as_uint32() + 1);
-          stack_.emplace_back(ContinuationRecord::kResumeFromOther, property,
-                              0);
+          ContinuationRecord rec1{ContinuationRecord::kObject, obj, i.as_uint32() + 1};
+          stack_.emplace_back(std::move(rec1));
+          ContinuationRecord rec2{ContinuationRecord::kResumeFromOther, property, 0};
+          stack_.emplace_back(std::move(rec2));
           result = SerializeObjectKey(key_name, comma, no_gc);
           if (V8_UNLIKELY(result != SUCCESS)) {
-            stack_.emplace_back(ContinuationRecord::kObjectKey, key_name,
-                                comma);
+            ContinuationRecord rec3{ContinuationRecord::kObjectKey, key_name, comma};
+            stack_.emplace_back(std::move(rec3));
             return result;
           }
           DCHECK(IsString(property));
           return result;
+        }
         case SLOW_PATH:
         case EXCEPTION:
           return result;
@@ -2449,15 +2452,21 @@ FastJsonStringifierResult FastJsonStringifier<Char>::SerializeFixedArrayElement(
       case UNDEFINED:
         AppendCStringLiteral("null");
         return SUCCESS;
-      case CHANGE_ENCODING:
+      case CHANGE_ENCODING: {
         DCHECK(IsString(obj));
-        stack_.emplace_back(ContinuationRecord::kArray, array, i + 1);
-        stack_.emplace_back(ContinuationRecord::kResumeFromOther, obj, 0);
+        ContinuationRecord rec1{ContinuationRecord::kArray, array, i + 1};
+        stack_.emplace_back(std::move(rec1));
+        ContinuationRecord rec2{ContinuationRecord::kResumeFromOther, obj, 0};
+        stack_.emplace_back(std::move(rec2));
         return result;
-      case UNCHANGED:
-        stack_.emplace_back(ContinuationRecord::kArray, array, i + 1);
-        stack_.emplace_back(ContinuationRecord::kResumeFromOther, obj, 0);
+      }
+      case UNCHANGED: {
+        ContinuationRecord rec1{ContinuationRecord::kArray, array, i + 1};
+        stack_.emplace_back(std::move(rec1));
+        ContinuationRecord rec2{ContinuationRecord::kResumeFromOther, obj, 0};
+        stack_.emplace_back(std::move(rec2));
         return result;
+      }
       default:
         return result;
     }
@@ -2534,7 +2543,8 @@ FastJsonStringifierResult FastJsonStringifier<Char>::SerializeObject(
   if constexpr (is_one_byte) {
     if (result == CHANGE_ENCODING) {
       DCHECK(IsString(object));
-      stack_.emplace_back(ContinuationRecord::kResumeFromOther, object, 0);
+      ContinuationRecord rec{ContinuationRecord::kResumeFromOther, object, 0};
+      stack_.emplace_back(std::move(rec));
       return result;
     }
   } else {
diff --git a/deps/v8/src/maglev/maglev-ir.h b/deps/v8/src/maglev/maglev-ir.h
index 3dcf8f7b7e3469..c404960b190efb 100644
--- a/deps/v8/src/maglev/maglev-ir.h
+++ b/deps/v8/src/maglev/maglev-ir.h
@@ -4025,7 +4025,7 @@ class CheckedNumberOrOddballToFloat64OrHoleyFloat64
 
  private:
   using TaggedToFloat64ConversionTypeOffset =
-      Base::template NextBitField<TaggedToFloat64ConversionType, 2>;
+      typename Base::template NextBitField<TaggedToFloat64ConversionType, 2>;
 };
 
 class CheckedNumberOrOddballToFloat64
diff --git a/deps/v8/src/objects/objects.h b/deps/v8/src/objects/objects.h
index 711cd51e759dad..8ff9b13d287679 100644
--- a/deps/v8/src/objects/objects.h
+++ b/deps/v8/src/objects/objects.h
@@ -604,11 +604,11 @@ class Object : public AllStatic {
       ConvertToInteger(Isolate* isolate, HandleType<Object> input);
   template <template <typename> typename HandleType>
     requires(std::is_convertible_v<HandleType<Object>, DirectHandle<Object>>)
-  V8_WARN_UNUSED_RESULT static HandleType<Number>::MaybeType ConvertToInt32(
+  V8_WARN_UNUSED_RESULT static typename HandleType<Number>::MaybeType ConvertToInt32(
       Isolate* isolate, HandleType<Object> input);
   template <template <typename> typename HandleType>
     requires(std::is_convertible_v<HandleType<Object>, DirectHandle<Object>>)
-  V8_WARN_UNUSED_RESULT static HandleType<Number>::MaybeType ConvertToUint32(
+  V8_WARN_UNUSED_RESULT static typename HandleType<Number>::MaybeType ConvertToUint32(
       Isolate* isolate, HandleType<Object> input);
   V8_EXPORT_PRIVATE V8_WARN_UNUSED_RESULT static MaybeHandle<Number>
   ConvertToLength(Isolate* isolate, DirectHandle<Object> input);
diff --git a/deps/v8/src/objects/smi.h b/deps/v8/src/objects/smi.h
index 220c80bbce8423..a09d97a8d96646 100644
--- a/deps/v8/src/objects/smi.h
+++ b/deps/v8/src/objects/smi.h
@@ -24,6 +24,29 @@ namespace internal {
 // Smi stands for small integer.
 class Smi : public AllStatic {
  public:
+  // Returns whether value can be represented in a Smi.
+  template <typename T>
+  static inline bool constexpr IsValid(T value)
+    requires(std::is_integral_v<T> && std::is_signed_v<T>)
+  {
+    DCHECK_EQ(Internals::IsValidSmi(value),
+              value >= kMinValue && value <= kMaxValue);
+    return Internals::IsValidSmi(value);
+  }
+  template <typename T>
+  static inline bool constexpr IsValid(T value)
+    requires(std::is_integral_v<T> && std::is_unsigned_v<T>)
+  {
+    DCHECK_EQ(Internals::IsValidSmi(value), value <= kMaxValue);
+    return Internals::IsValidSmi(value);
+  }
+
+  // Convert a value to a Smi object.
+  static inline constexpr Tagged<Smi> FromInt(int value) {
+    DCHECK(Smi::IsValid(value));
+    return Tagged<Smi>(Internals::IntegralToSmi(value));
+  }
+
   static inline constexpr Tagged<Smi> ToUint32Smi(Tagged<Smi> smi) {
     if (smi.value() <= 0) return Smi::FromInt(0);
     return Smi::FromInt(static_cast<uint32_t>(smi.value()));
@@ -34,12 +57,6 @@ class Smi : public AllStatic {
     return Tagged<Smi>(object.ptr()).value();
   }
 
-  // Convert a value to a Smi object.
-  static inline constexpr Tagged<Smi> FromInt(int value) {
-    DCHECK(Smi::IsValid(value));
-    return Tagged<Smi>(Internals::IntegralToSmi(value));
-  }
-
   static inline constexpr Tagged<Smi> FromIntptr(intptr_t value) {
     DCHECK(Smi::IsValid(value));
     int smi_shift_bits = kSmiTagSize + kSmiShiftSize;
@@ -62,23 +79,6 @@ class Smi : public AllStatic {
     return FromInt(static_cast<int>(value));
   }
 
-  // Returns whether value can be represented in a Smi.
-  template <typename T>
-  static inline bool constexpr IsValid(T value)
-    requires(std::is_integral_v<T> && std::is_signed_v<T>)
-  {
-    DCHECK_EQ(Internals::IsValidSmi(value),
-              value >= kMinValue && value <= kMaxValue);
-    return Internals::IsValidSmi(value);
-  }
-  template <typename T>
-  static inline bool constexpr IsValid(T value)
-    requires(std::is_integral_v<T> && std::is_unsigned_v<T>)
-  {
-    DCHECK_EQ(Internals::IsValidSmi(value), value <= kMaxValue);
-    return Internals::IsValidSmi(value);
-  }
-
   // Compare two Smis x, y as if they were converted to strings and then
   // compared lexicographically. Returns:
   // -1 if x < y.
diff --git a/deps/v8/src/sandbox/external-entity-table.h b/deps/v8/src/sandbox/external-entity-table.h
index 01e5c14a327687..ca1fff820f7664 100644
--- a/deps/v8/src/sandbox/external-entity-table.h
+++ b/deps/v8/src/sandbox/external-entity-table.h
@@ -48,9 +48,9 @@ class V8_EXPORT_PRIVATE ExternalEntityTable
     : public SegmentedTable<Entry, size> {
  protected:
   using Base = SegmentedTable<Entry, size>;
-  using FreelistHead = Base::FreelistHead;
-  using Segment = Base::Segment;
-  using WriteIterator = Base::WriteIterator;
+  using FreelistHead = typename Base::FreelistHead;
+  using Segment = typename Base::Segment;
+  using WriteIterator = typename Base::WriteIterator;
   static constexpr size_t kSegmentSize = Base::kSegmentSize;
   static constexpr size_t kEntriesPerSegment = Base::kEntriesPerSegment;
   static constexpr size_t kEntrySize = Base::kEntrySize;