diff --git a/.travis.yml b/.travis.yml
index b1f7bc67..f1922462 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,6 +9,7 @@ notifications:
 node_js:
   - "8"
   - "10"
+  - "12"
 
 before_install:
   - export CXX="g++-4.9" CC="gcc-4.9"
diff --git a/package.json b/package.json
index de461b76..2fa538ee 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,7 @@
   },
   "homepage": "https://github.com/atom/superstring",
   "dependencies": {
-    "nan": "^2.10.0"
+    "nan": "^2.13.2"
   },
   "devDependencies": {
     "chai": "^2.0.0",
diff --git a/src/bindings/marker-index-wrapper.cc b/src/bindings/marker-index-wrapper.cc
index 8b835737..abdfa8a0 100644
--- a/src/bindings/marker-index-wrapper.cc
+++ b/src/bindings/marker-index-wrapper.cc
@@ -70,7 +70,7 @@ void MarkerIndexWrapper::init(Local<Object> exports) {
   ending_string.Reset(Nan::Persistent<String>(Nan::New("ending").ToLocalChecked()));
 
   marker_index_constructor_template.Reset(constructor_template);
-  exports->Set(Nan::New("MarkerIndex").ToLocalChecked(), constructor_template->GetFunction());
+  Nan::Set(exports, Nan::New("MarkerIndex").ToLocalChecked(), Nan::GetFunction(constructor_template).ToLocalChecked());
 }
 
 MarkerIndex *MarkerIndexWrapper::from_js(Local<Value> value) {
@@ -347,7 +347,7 @@ void MarkerIndexWrapper::find_boundaries_after(const Nan::FunctionCallbackInfo<V
   optional<size_t> max_count;
   Local<Integer> js_max_count;
   if (Nan::To<Integer>(info[1]).ToLocal(&js_max_count)) {
-    max_count = js_max_count->NumberValue();
+    max_count = Nan::To<uint32_t>(js_max_count).FromMaybe(0);
   }
 
   if (start && max_count) {
diff --git a/src/bindings/number-conversion.h b/src/bindings/number-conversion.h
index 4c75a240..cc063be9 100644
--- a/src/bindings/number-conversion.h
+++ b/src/bindings/number-conversion.h
@@ -9,10 +9,12 @@ namespace number_conversion {
   optional<T> number_from_js(v8::Local<v8::Value> js_value) {
     v8::Local<v8::Number> js_number;
     if (Nan::To<v8::Number>(js_value).ToLocal(&js_number)) {
-      return js_number->NumberValue();
-    } else {
-      return optional<T>{};
+      auto maybe_number = Nan::To<T>(js_number);
+      if (maybe_number.IsJust()) {
+        return maybe_number.FromJust();
+      }
     }
+    return optional<T>{};
   }
 }
 
diff --git a/src/bindings/patch-wrapper.cc b/src/bindings/patch-wrapper.cc
index 30363e0b..d2672ace 100644
--- a/src/bindings/patch-wrapper.cc
+++ b/src/bindings/patch-wrapper.cc
@@ -37,7 +37,7 @@ class ChangeWrapper : public Nan::ObjectWrap {
 
     const auto &prototype_template = constructor_template->PrototypeTemplate();
     prototype_template->Set(Nan::New<String>("toString").ToLocalChecked(), Nan::New<FunctionTemplate>(to_string));
-    change_wrapper_constructor.Reset(constructor_template->GetFunction());
+    change_wrapper_constructor.Reset(Nan::GetFunction(constructor_template).ToLocalChecked());
   }
 
   static Local<Value> FromChange(Patch::Change change) {
@@ -137,7 +137,7 @@ void PatchWrapper::init(Local<Object> exports) {
   prototype_template->Set(Nan::New("getChangeCount").ToLocalChecked(), Nan::New<FunctionTemplate>(get_change_count));
   prototype_template->Set(Nan::New("getBounds").ToLocalChecked(), Nan::New<FunctionTemplate>(get_bounds));
   patch_wrapper_constructor_template.Reset(constructor_template_local);
-  patch_wrapper_constructor.Reset(constructor_template_local->GetFunction());
+  patch_wrapper_constructor.Reset(Nan::GetFunction(constructor_template_local).ToLocalChecked());
   exports->Set(Nan::New("Patch").ToLocalChecked(), Nan::New(patch_wrapper_constructor));
 }
 
@@ -158,10 +158,9 @@ void PatchWrapper::construct(const Nan::FunctionCallbackInfo<Value> &info) {
   Local<Object> options;
 
   if (info.Length() > 0 && Nan::To<Object>(info[0]).ToLocal(&options)) {
-    Local<Boolean> js_merge_adjacent_changes;
-    if (Nan::To<Boolean>(options->Get(Nan::New("mergeAdjacentChanges").ToLocalChecked()))
-            .ToLocal(&js_merge_adjacent_changes)) {
-      merges_adjacent_changes = js_merge_adjacent_changes->BooleanValue();
+    Local<Value> js_merge_adjacent_changes;
+    if (Nan::Get(options, Nan::New("mergeAdjacentChanges").ToLocalChecked()).ToLocal(&js_merge_adjacent_changes)) {
+      merges_adjacent_changes = Nan::To<bool>(js_merge_adjacent_changes).FromMaybe(false);
     }
   }
   PatchWrapper *patch = new PatchWrapper(Patch{merges_adjacent_changes});
diff --git a/src/bindings/point-wrapper.cc b/src/bindings/point-wrapper.cc
index 4dd163b6..be66cd8b 100644
--- a/src/bindings/point-wrapper.cc
+++ b/src/bindings/point-wrapper.cc
@@ -9,7 +9,7 @@ static Nan::Persistent<String> column_string;
 static Nan::Persistent<v8::Function> constructor;
 
 static uint32_t number_from_js(Local<Integer> js_number) {
-  double number = js_number->NumberValue();
+  double number = Nan::To<double>(js_number).FromMaybe(0);
   if (number > 0 && !std::isfinite(number)) {
     return UINT32_MAX;
   } else {
@@ -51,7 +51,7 @@ void PointWrapper::init() {
   constructor_template->InstanceTemplate()->SetInternalFieldCount(1);
   Nan::SetAccessor(constructor_template->InstanceTemplate(), Nan::New(row_string), get_row);
   Nan::SetAccessor(constructor_template->InstanceTemplate(), Nan::New(column_string), get_column);
-  constructor.Reset(constructor_template->GetFunction());
+  constructor.Reset(Nan::GetFunction(constructor_template).ToLocalChecked());
 }
 
 Local<Value> PointWrapper::from_point(Point point) {
diff --git a/src/bindings/range-wrapper.cc b/src/bindings/range-wrapper.cc
index f6ab020b..346301a6 100644
--- a/src/bindings/range-wrapper.cc
+++ b/src/bindings/range-wrapper.cc
@@ -34,7 +34,7 @@ void RangeWrapper::init() {
   constructor_template->InstanceTemplate()->SetInternalFieldCount(1);
   Nan::SetAccessor(constructor_template->InstanceTemplate(), Nan::New(start_string), get_start);
   Nan::SetAccessor(constructor_template->InstanceTemplate(), Nan::New(end_string), get_end);
-  constructor.Reset(constructor_template->GetFunction());
+  constructor.Reset(Nan::GetFunction(constructor_template).ToLocalChecked());
 }
 
 Local<Value> RangeWrapper::from_range(Range range) {
diff --git a/src/bindings/string-conversion.cc b/src/bindings/string-conversion.cc
index a442b69c..7730fe01 100644
--- a/src/bindings/string-conversion.cc
+++ b/src/bindings/string-conversion.cc
@@ -14,6 +14,12 @@ optional<u16string> string_conversion::string_from_js(Local<Value> value) {
   u16string result;
   result.resize(string->Length());
   string->Write(
+
+    // Nan doesn't wrap this functionality
+    #if NODE_MAJOR_VERSION >= 12
+          Isolate::GetCurrent(),
+    #endif
+
     reinterpret_cast<uint16_t *>(&result[0]),
     0,
     -1,
diff --git a/src/bindings/text-buffer-snapshot-wrapper.cc b/src/bindings/text-buffer-snapshot-wrapper.cc
index 3ce25a7f..cfd03ec3 100644
--- a/src/bindings/text-buffer-snapshot-wrapper.cc
+++ b/src/bindings/text-buffer-snapshot-wrapper.cc
@@ -16,7 +16,7 @@ void TextBufferSnapshotWrapper::init() {
   const auto &prototype_template = constructor_template->PrototypeTemplate();
   prototype_template->Set(Nan::New("destroy").ToLocalChecked(), Nan::New<FunctionTemplate>(destroy));
 
-  snapshot_wrapper_constructor.Reset(constructor_template->GetFunction());
+  snapshot_wrapper_constructor.Reset(Nan::GetFunction(constructor_template).ToLocalChecked());
 }
 
 TextBufferSnapshotWrapper::TextBufferSnapshotWrapper(Local<Object> js_buffer, void *snapshot) :
@@ -46,7 +46,7 @@ void TextBufferSnapshotWrapper::construct(const Nan::FunctionCallbackInfo<Value>
 }
 
 void TextBufferSnapshotWrapper::destroy(const Nan::FunctionCallbackInfo<Value> &info) {
-  auto reader = Nan::ObjectWrap::Unwrap<TextBufferSnapshotWrapper>(info.This()->ToObject());
+  auto reader = Nan::ObjectWrap::Unwrap<TextBufferSnapshotWrapper>(Nan::To<Object>(info.This()).ToLocalChecked());
   if (reader->snapshot) {
     delete reinterpret_cast<TextBuffer::Snapshot *>(reader->snapshot);
     reader->snapshot = nullptr;
diff --git a/src/bindings/text-buffer-wrapper.cc b/src/bindings/text-buffer-wrapper.cc
index 8d0c6b95..1c24ae46 100644
--- a/src/bindings/text-buffer-wrapper.cc
+++ b/src/bindings/text-buffer-wrapper.cc
@@ -93,7 +93,7 @@ class RegexWrapper : public Nan::ObjectWrap {
       js_regex = Local<RegExp>::Cast(value);
       Local<Value> stored_regex = js_regex->Get(cache_key);
       if (!stored_regex->IsUndefined()) {
-        return &Nan::ObjectWrap::Unwrap<RegexWrapper>(stored_regex->ToObject())->regex;
+        return &Nan::ObjectWrap::Unwrap<RegexWrapper>(Nan::To<Object>(stored_regex).ToLocalChecked())->regex;
       }
       js_pattern = js_regex->GetSource();
       if (js_regex->GetFlags() & RegExp::kIgnoreCase) ignore_case = true;
@@ -127,7 +127,7 @@ class RegexWrapper : public Nan::ObjectWrap {
     Local<FunctionTemplate> constructor_template = Nan::New<FunctionTemplate>(construct);
     constructor_template->SetClassName(Nan::New<String>("TextBufferRegex").ToLocalChecked());
     constructor_template->InstanceTemplate()->SetInternalFieldCount(1);
-    constructor.Reset(constructor_template->GetFunction());
+    constructor.Reset(Nan::GetFunction(constructor_template).ToLocalChecked());
   }
 };
 
@@ -150,7 +150,7 @@ class SubsequenceMatchWrapper : public Nan::ObjectWrap {
     Nan::SetAccessor(instance_template, Nan::New("matchIndices").ToLocalChecked(), get_match_indices);
     Nan::SetAccessor(instance_template, Nan::New("score").ToLocalChecked(), get_score);
 
-    constructor.Reset(constructor_template->GetFunction());
+    constructor.Reset(Nan::GetFunction(constructor_template).ToLocalChecked());
   }
 
   static Local<Value> from_subsequence_match(SubsequenceMatch match) {
@@ -227,7 +227,7 @@ void TextBufferWrapper::init(Local<Object> exports) {
   prototype_template->Set(Nan::New("getSnapshot").ToLocalChecked(), Nan::New<FunctionTemplate>(get_snapshot));
   RegexWrapper::init();
   SubsequenceMatchWrapper::init();
-  exports->Set(Nan::New("TextBuffer").ToLocalChecked(), constructor_template->GetFunction());
+  exports->Set(Nan::New("TextBuffer").ToLocalChecked(), Nan::GetFunction(constructor_template).ToLocalChecked());
 }
 
 void TextBufferWrapper::construct(const Nan::FunctionCallbackInfo<Value> &info) {
@@ -470,7 +470,7 @@ void TextBufferWrapper::find_and_mark_all_sync(const Nan::FunctionCallbackInfo<V
   auto next_id = Nan::To<unsigned>(info[1]);
   if (!next_id.IsJust()) return;
   if (!info[2]->IsBoolean()) return;
-  bool exclusive = info[2]->BooleanValue();
+  bool exclusive = Nan::To<bool>(info[2]).FromMaybe(false);
 
   const Regex *regex = RegexWrapper::regex_from_js(info[3]);
   if (regex) {
@@ -628,7 +628,7 @@ void TextBufferWrapper::find_words_with_subsequence_in_range(const Nan::Function
 
   auto query = string_conversion::string_from_js(info[0]);
   auto extra_word_characters = string_conversion::string_from_js(info[1]);
-  auto max_count = number_conversion::number_from_js<size_t>(info[2]);
+  auto max_count = number_conversion::number_from_js<uint32_t>(info[2]);
   auto range = RangeWrapper::range_from_js(info[3]);
   auto callback = new Nan::Callback(info[4].As<Function>());
 
@@ -926,7 +926,8 @@ void TextBufferWrapper::load(const Nan::FunctionCallbackInfo<Value> &info) {
 
   if (!force && text_buffer.is_modified()) {
     Local<Value> argv[] = {Nan::Null(), Nan::Null()};
-    info[0].As<Function>()->Call(Nan::Null(), 2, argv);
+    auto callback = info[0].As<Function>();
+    Nan::Call(callback, callback->CreationContext()->Global(), 2, argv);
     return;
   }
 
@@ -958,7 +959,7 @@ void TextBufferWrapper::load(const Nan::FunctionCallbackInfo<Value> &info) {
       compute_patch
     );
   } else {
-    auto text_writer = Nan::ObjectWrap::Unwrap<TextWriter>(info[4]->ToObject());
+    auto text_writer = Nan::ObjectWrap::Unwrap<TextWriter>(Nan::To<Object>(info[4]).ToLocalChecked());
     worker = new LoadWorker(
       completion_callback,
       progress_callback,
@@ -1026,10 +1027,11 @@ void TextBufferWrapper::base_text_matches_file(const Nan::FunctionCallbackInfo<V
       move(encoding_name)
     ));
   } else {
-    auto file_contents = Nan::ObjectWrap::Unwrap<TextWriter>(info[1]->ToObject())->get_text();
+    auto file_contents = Nan::ObjectWrap::Unwrap<TextWriter>(Nan::To<Object>(info[1]).ToLocalChecked())->get_text();
     bool result = std::equal(file_contents.begin(), file_contents.end(), text_buffer.base_text().begin());
     Local<Value> argv[] = {Nan::Null(), Nan::New<Boolean>(result)};
-    info[0].As<Function>()->Call(Nan::Null(), 2, argv);
+    auto callback = info[0].As<Function>();
+    Nan::Call(callback, callback->CreationContext()->Global(), 2, argv);
   }
 }
 
diff --git a/src/bindings/text-reader.cc b/src/bindings/text-reader.cc
index 7ad3369c..555cfac9 100644
--- a/src/bindings/text-reader.cc
+++ b/src/bindings/text-reader.cc
@@ -15,7 +15,7 @@ void TextReader::init(Local<Object> exports) {
   prototype_template->Set(Nan::New("read").ToLocalChecked(), Nan::New<FunctionTemplate>(read));
   prototype_template->Set(Nan::New("end").ToLocalChecked(), Nan::New<FunctionTemplate>(end));
   prototype_template->Set(Nan::New("destroy").ToLocalChecked(), Nan::New<FunctionTemplate>(destroy));
-  exports->Set(Nan::New("TextReader").ToLocalChecked(), constructor_template->GetFunction());
+  exports->Set(Nan::New("TextReader").ToLocalChecked(), Nan::GetFunction(constructor_template).ToLocalChecked());
 }
 
 TextReader::TextReader(Local<Object> js_buffer,
@@ -34,13 +34,14 @@ TextReader::~TextReader() {
 }
 
 void TextReader::construct(const Nan::FunctionCallbackInfo<Value> &info) {
-  auto js_text_buffer = info[0]->ToObject();
+  Local<Object> js_text_buffer;
+  if (!Nan::To<Object>(info[0]).ToLocal(&js_text_buffer)) return;
   auto &text_buffer = Nan::ObjectWrap::Unwrap<TextBufferWrapper>(js_text_buffer)->text_buffer;
   auto snapshot = text_buffer.create_snapshot();
 
   Local<String> js_encoding_name;
   if (!Nan::To<String>(info[1]).ToLocal(&js_encoding_name)) return;
-  String::Utf8Value encoding_name(js_encoding_name);
+  Nan::Utf8String encoding_name(js_encoding_name);
   auto conversion = transcoding_to(*encoding_name);
   if (!conversion) {
     Nan::ThrowError((string("Invalid encoding name: ") + *encoding_name).c_str());
@@ -52,7 +53,7 @@ void TextReader::construct(const Nan::FunctionCallbackInfo<Value> &info) {
 }
 
 void TextReader::read(const Nan::FunctionCallbackInfo<Value> &info) {
-  TextReader *reader = Nan::ObjectWrap::Unwrap<TextReader>(info.This()->ToObject());
+  TextReader *reader = Nan::ObjectWrap::Unwrap<TextReader>(Nan::To<Object>(info.This()).ToLocalChecked());
 
   if (!info[0]->IsUint8Array()) {
     Nan::ThrowError("Expected a buffer");
@@ -87,7 +88,7 @@ void TextReader::read(const Nan::FunctionCallbackInfo<Value> &info) {
 }
 
 void TextReader::end(const Nan::FunctionCallbackInfo<Value> &info) {
-  TextReader *reader = Nan::ObjectWrap::Unwrap<TextReader>(info.This()->ToObject());
+  TextReader *reader = Nan::ObjectWrap::Unwrap<TextReader>(Nan::To<Object>(info.This()).ToLocalChecked());
   if (reader->snapshot) {
     reader->snapshot->flush_preceding_changes();
     delete reader->snapshot;
@@ -96,9 +97,9 @@ void TextReader::end(const Nan::FunctionCallbackInfo<Value> &info) {
 }
 
 void TextReader::destroy(const Nan::FunctionCallbackInfo<Value> &info) {
-  TextReader *reader = Nan::ObjectWrap::Unwrap<TextReader>(info.This()->ToObject());
+  TextReader *reader = Nan::ObjectWrap::Unwrap<TextReader>(Nan::To<Object>(info.This()).ToLocalChecked());
   if (reader->snapshot) {
     delete reader->snapshot;
     reader->snapshot = nullptr;
   }
-}
\ No newline at end of file
+}
diff --git a/src/bindings/text-writer.cc b/src/bindings/text-writer.cc
index 321a6081..9a330a84 100644
--- a/src/bindings/text-writer.cc
+++ b/src/bindings/text-writer.cc
@@ -12,7 +12,7 @@ void TextWriter::init(Local<Object> exports) {
   const auto &prototype_template = constructor_template->PrototypeTemplate();
   prototype_template->Set(Nan::New("write").ToLocalChecked(), Nan::New<FunctionTemplate>(write));
   prototype_template->Set(Nan::New("end").ToLocalChecked(), Nan::New<FunctionTemplate>(end));
-  exports->Set(Nan::New("TextWriter").ToLocalChecked(), constructor_template->GetFunction());
+  exports->Set(Nan::New("TextWriter").ToLocalChecked(), Nan::GetFunction(constructor_template).ToLocalChecked());
 }
 
 TextWriter::TextWriter(EncodingConversion &&conversion) : conversion{move(conversion)} {}
@@ -20,7 +20,7 @@ TextWriter::TextWriter(EncodingConversion &&conversion) : conversion{move(conver
 void TextWriter::construct(const Nan::FunctionCallbackInfo<Value> &info) {
   Local<String> js_encoding_name;
   if (!Nan::To<String>(info[0]).ToLocal(&js_encoding_name)) return;
-  String::Utf8Value encoding_name(js_encoding_name);
+  Nan::Utf8String encoding_name(js_encoding_name);
   auto conversion = transcoding_from(*encoding_name);
   if (!conversion) {
     Nan::ThrowError((string("Invalid encoding name: ") + *encoding_name).c_str());
@@ -34,11 +34,17 @@ void TextWriter::construct(const Nan::FunctionCallbackInfo<Value> &info) {
 void TextWriter::write(const Nan::FunctionCallbackInfo<Value> &info) {
   auto writer = Nan::ObjectWrap::Unwrap<TextWriter>(info.This());
 
-  if (info[0]->IsString()) {
-    Local<String> js_chunk = info[0]->ToString();
+  Local<String> js_chunk;
+  if (Nan::To<String>(info[0]).ToLocal(&js_chunk)) {
     size_t size = writer->content.size();
     writer->content.resize(size + js_chunk->Length());
     js_chunk->Write(
+
+// Nan doesn't wrap this functionality
+#if NODE_MAJOR_VERSION >= 12
+      Isolate::GetCurrent(),
+#endif
+
       reinterpret_cast<uint16_t *>(&writer->content[0]) + size,
       0,
       -1,