diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5e8872af..9532f184 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,7 +22,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: [24.x, 23.x, 22.x, 21.x, 20.x, 19.x, 18.x, 17.x, 16.x]
+        node-version: [25.x, 24.x, 23.x, 22.x, 21.x, 20.x, 19.x, 18.x, 17.x, 16.x]
         os: [windows-latest]
         include:
           - node-version: lts/*
@@ -35,6 +35,8 @@ jobs:
             os: ubuntu-24.04-arm  # Linux on arm64
           - node-version: lts/*
             os: windows-2025
+          - node-version: lts/*
+            os: windows-11-arm  # Windows on arm64
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
diff --git a/appveyor.yml b/appveyor.yml
index 338a8d5b..b00b646c 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -14,17 +14,6 @@ image:
 environment:
   NODE_GYP_FORCE_PYTHON: C:\Python39-x64\python.exe
   matrix:  # Test against these versions of Io.js and Node.js.
-    - nodejs_version: "24"
-    - nodejs_version: "23"
-    - nodejs_version: "22"
-    - nodejs_version: "22"
-      NODE_GYP_FORCE_PYTHON: C:\Python312-x64\python.exe
-    - nodejs_version: "21"
-    - nodejs_version: "20"
-    - nodejs_version: "19"
-    - nodejs_version: "18"
-    - nodejs_version: "17"
-    - nodejs_version: "16"
     - nodejs_version: "14"
       APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
     - nodejs_version: "12"
diff --git a/nan.h b/nan.h
index f0bfc0c6..fd2b2b24 100644
--- a/nan.h
+++ b/nan.h
@@ -427,15 +427,12 @@ template<typename P> class WeakCallbackInfo;
 
 namespace imp {
   static const size_t kMaxLength = 0x3fffffff;
-  // v8::String::REPLACE_INVALID_UTF8 was introduced
-  // in node.js v0.10.29 and v0.8.27.
-#if NODE_MAJOR_VERSION > 0 || \
-    NODE_MINOR_VERSION > 10 || \
-    NODE_MINOR_VERSION == 10 && NODE_PATCH_VERSION >= 29 || \
-    NODE_MINOR_VERSION == 8 && NODE_PATCH_VERSION >= 27
-  static const unsigned kReplaceInvalidUtf8 = v8::String::REPLACE_INVALID_UTF8;
+#if defined(V8_MAJOR_VERSION) && (V8_MAJOR_VERSION > 13 ||                     \
+  (V8_MAJOR_VERSION == 13 && defined(V8_MINOR_VERSION) && V8_MINOR_VERSION >= 4))
+  static const unsigned kReplaceInvalidUtf8
+    = v8::String::WriteFlags::kReplaceInvalidUtf8;
 #else
-  static const unsigned kReplaceInvalidUtf8 = 0;
+  static const unsigned kReplaceInvalidUtf8 = v8::String::REPLACE_INVALID_UTF8;
 #endif
 }  // end of namespace imp
 
@@ -1167,11 +1164,18 @@ class Utf8String {
           str_ = static_cast<char*>(malloc(len));
           assert(str_ != 0);
         }
-        const int flags =
-            v8::String::NO_NULL_TERMINATION | imp::kReplaceInvalidUtf8;
 #if NODE_MAJOR_VERSION >= 11
-        length_ = string->WriteUtf8(v8::Isolate::GetCurrent(), str_,
+#if defined(V8_MAJOR_VERSION) && (V8_MAJOR_VERSION > 13 ||                     \
+  (V8_MAJOR_VERSION == 13 && defined(V8_MINOR_VERSION) && V8_MINOR_VERSION >= 4))
+    length_ = string->WriteUtf8V2(v8::Isolate::GetCurrent(), str_,
+                                    static_cast<int>(len), imp::kReplaceInvalidUtf8);
+#else
+    const int flags =
+        v8::String::NO_NULL_TERMINATION | imp::kReplaceInvalidUtf8;
+    length_ = string->WriteUtf8(v8::Isolate::GetCurrent(), str_,
                                     static_cast<int>(len), 0, flags);
+#endif
+
 #else
         // See https://github.com/nodejs/nan/issues/832.
         // Disable the warning as there is no way around it.
@@ -1183,7 +1187,9 @@ class Utf8String {
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 #endif
-        length_ = string->WriteUtf8(str_, static_cast<int>(len), 0, flags);
+  const int flags =
+    v8::String::NO_NULL_TERMINATION | imp::kReplaceInvalidUtf8;
+  length_ = string->WriteUtf8(str_, static_cast<int>(len), 0, flags);
 #ifdef __GNUC__
 #pragma GCC diagnostic pop
 #endif
@@ -2626,7 +2632,9 @@ NAN_DEPRECATED inline void SetAccessor(
     , getter_
     , setter_
     , obj
-#if !defined(V8_MAJOR_VERSION) || V8_MAJOR_VERSION < 12
+#if defined(V8_MAJOR_VERSION) && (V8_MAJOR_VERSION < 12 \
+            || (V8_MAJOR_VERSION == 12 && defined(V8_MINOR_VERSION) \
+            && V8_MINOR_VERSION == 0))
     , settings
 #endif
     , attribute
@@ -2680,7 +2688,9 @@ inline void SetAccessor(
     , getter_
     , setter_
     , obj
-#if !defined(V8_MAJOR_VERSION) || V8_MAJOR_VERSION < 12
+#if defined(V8_MAJOR_VERSION) && (V8_MAJOR_VERSION < 12 \
+            || (V8_MAJOR_VERSION == 12 && defined(V8_MINOR_VERSION) \
+            && V8_MINOR_VERSION == 0))
     , settings
 #endif
     , attribute
diff --git a/nan_maybe_43_inl.h b/nan_maybe_43_inl.h
index f37ce973..48b62e9d 100644
--- a/nan_maybe_43_inl.h
+++ b/nan_maybe_43_inl.h
@@ -207,7 +207,11 @@ inline Maybe<bool> SetPrototype(
   , v8::Local<v8::Value> prototype) {
   v8::Isolate *isolate = v8::Isolate::GetCurrent();
   v8::HandleScope scope(isolate);
-  return obj->SetPrototype(isolate->GetCurrentContext(), prototype);
+#if defined(V8_MAJOR_VERSION) && (V8_MAJOR_VERSION >= 14)
+    return obj->SetPrototypeV2(isolate->GetCurrentContext(), prototype);
+#else
+    return obj->SetPrototype(isolate->GetCurrentContext(), prototype);
+#endif
 }
 
 inline MaybeLocal<v8::String> ObjectProtoToString(