diff --git a/CHANGELOG.md b/CHANGELOG.md
index cf06f4c..9056603 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,10 @@
+## 1.2.3 (2023-09-11)
+
+- Removed support for `inline class` keyword and added support for `extension type`.
+
 ## 1.2.2 (2023-06-28)
 
-- Added support for `inline` keyword.
+- Added support for `inline class`.
 
 ## 1.2.1 (2023-05-04)
 
diff --git a/grammars/dart.json b/grammars/dart.json
index c6c1bfd..55df9d6 100644
--- a/grammars/dart.json
+++ b/grammars/dart.json
@@ -1,6 +1,6 @@
 {
 	"name": "Dart",
-	"version": "1.2.2",
+	"version": "1.2.3",
 	"fileTypes": [
 		"dart"
 	],
@@ -336,7 +336,7 @@
 				},
 				{
 					"name": "keyword.declaration.dart",
-					"match": "(?<!\\$)\\b(abstract|sealed|base|interface|inline class|class|enum|extends|extension|external|factory|implements|get(?!\\()|mixin|native|operator|set(?!\\()|typedef|with|covariant)\\b(?!\\$)"
+					"match": "(?<!\\$)\\b(abstract|sealed|base|interface|class|enum|extends|extension type|extension|external|factory|implements|get(?!\\()|mixin|native|operator|set(?!\\()|typedef|with|covariant)\\b(?!\\$)"
 				},
 				{
 					"name": "storage.modifier.dart",
diff --git a/test/goldens/extension_types.dart.golden b/test/goldens/extension_types.dart.golden
new file mode 100644
index 0000000..34c7228
--- /dev/null
+++ b/test/goldens/extension_types.dart.golden
@@ -0,0 +1,71 @@
+>// Copyright (c) 2023, the Dart project authors. Please see the AUTHORS file
+#^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ comment.line.double-slash.dart
+>// for details. All rights reserved. Use of this source code is governed by a
+#^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ comment.line.double-slash.dart
+>// BSD-style license that can be found in the LICENSE file.
+#^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ comment.line.double-slash.dart
+>
+>extension type MyInt(int it) {
+#^^^^^^^^^^^^^^ keyword.declaration.dart
+#               ^^^^^ support.class.dart
+#                     ^^^ support.class.dart
+>  void foo() { print(it.isEven); }
+#  ^^^^ storage.type.primitive.dart
+#       ^^^ entity.name.function.dart
+#               ^^^^^ entity.name.function.dart
+#                       ^ punctuation.dot.dart
+#                               ^ punctuation.terminator.dart
+>}
+>
+>final extension = 1;
+#^^^^^ storage.modifier.dart
+#      ^^^^^^^^^ keyword.declaration.dart
+#                ^ keyword.operator.assignment.dart
+#                  ^ constant.numeric.dart
+#                   ^ punctuation.terminator.dart
+>int get extension => 1;
+#^^^ support.class.dart
+#    ^^^ keyword.declaration.dart
+#        ^^^^^^^^^ keyword.declaration.dart
+#                  ^^ keyword.operator.closure.dart
+#                     ^ constant.numeric.dart
+#                      ^ punctuation.terminator.dart
+>set extension(int value) {}
+#^^^ keyword.declaration.dart
+#    ^^^^^^^^^ keyword.declaration.dart
+#              ^^^ support.class.dart
+>void extension() {
+#^^^^ storage.type.primitive.dart
+#     ^^^^^^^^^ keyword.declaration.dart
+>  var extension = 1;
+#  ^^^ storage.type.primitive.dart
+#      ^^^^^^^^^ keyword.declaration.dart
+#                ^ keyword.operator.assignment.dart
+#                  ^ constant.numeric.dart
+#                   ^ punctuation.terminator.dart
+>}
+>
+>final type = 1;
+#^^^^^ storage.modifier.dart
+#           ^ keyword.operator.assignment.dart
+#             ^ constant.numeric.dart
+#              ^ punctuation.terminator.dart
+>int get type => 1;
+#^^^ support.class.dart
+#    ^^^ keyword.declaration.dart
+#             ^^ keyword.operator.closure.dart
+#                ^ constant.numeric.dart
+#                 ^ punctuation.terminator.dart
+>set type(int value) {}
+#^^^ keyword.declaration.dart
+#    ^^^^ entity.name.function.dart
+#         ^^^ support.class.dart
+>void type() {
+#^^^^ storage.type.primitive.dart
+#     ^^^^ entity.name.function.dart
+>  var type = 1;
+#  ^^^ storage.type.primitive.dart
+#           ^ keyword.operator.assignment.dart
+#             ^ constant.numeric.dart
+#              ^ punctuation.terminator.dart
+>}
diff --git a/test/goldens/inline.dart.golden b/test/goldens/inline.dart.golden
deleted file mode 100644
index a309174..0000000
--- a/test/goldens/inline.dart.golden
+++ /dev/null
@@ -1,53 +0,0 @@
->// Copyright (c) 2023, the Dart project authors. Please see the AUTHORS file
-#^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ comment.line.double-slash.dart
->// for details. All rights reserved. Use of this source code is governed by a
-#^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ comment.line.double-slash.dart
->// BSD-style license that can be found in the LICENSE file.
-#^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ comment.line.double-slash.dart
->
->inline class MyInt {
-#^^^^^^^^^^^^ keyword.declaration.dart
-#             ^^^^^ support.class.dart
->  final int it;
-#  ^^^^^ storage.modifier.dart
-#        ^^^ support.class.dart
-#              ^ punctuation.terminator.dart
->  MyInt(this.it);
-#  ^^^^^ support.class.dart
-#        ^^^^ variable.language.dart
-#            ^ punctuation.dot.dart
-#                ^ punctuation.terminator.dart
->  void foo() { print('MyInt.foo'); }
-#  ^^^^ storage.type.primitive.dart
-#       ^^^ entity.name.function.dart
-#               ^^^^^ entity.name.function.dart
-#                     ^^^^^^^^^^^ string.interpolated.single.dart
-#                                 ^ punctuation.terminator.dart
->}
->
->final inline = 1;
-#^^^^^ storage.modifier.dart
-#             ^ keyword.operator.assignment.dart
-#               ^ constant.numeric.dart
-#                ^ punctuation.terminator.dart
->
->int get inline => 1;
-#^^^ support.class.dart
-#    ^^^ keyword.declaration.dart
-#               ^^ keyword.operator.closure.dart
-#                  ^ constant.numeric.dart
-#                   ^ punctuation.terminator.dart
->set inline(int value) {}
-#^^^ keyword.declaration.dart
-#    ^^^^^^ entity.name.function.dart
-#           ^^^ support.class.dart
->
->void inline() {
-#^^^^ storage.type.primitive.dart
-#     ^^^^^^ entity.name.function.dart
->  var inline = 1;
-#  ^^^ storage.type.primitive.dart
-#             ^ keyword.operator.assignment.dart
-#               ^ constant.numeric.dart
-#                ^ punctuation.terminator.dart
->}
diff --git a/test/test_files/extension_types.dart b/test/test_files/extension_types.dart
new file mode 100644
index 0000000..82ba5cf
--- /dev/null
+++ b/test/test_files/extension_types.dart
@@ -0,0 +1,21 @@
+// Copyright (c) 2023, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+extension type MyInt(int it) {
+  void foo() { print(it.isEven); }
+}
+
+final extension = 1;
+int get extension => 1;
+set extension(int value) {}
+void extension() {
+  var extension = 1;
+}
+
+final type = 1;
+int get type => 1;
+set type(int value) {}
+void type() {
+  var type = 1;
+}
diff --git a/test/test_files/inline.dart b/test/test_files/inline.dart
deleted file mode 100644
index e128ceb..0000000
--- a/test/test_files/inline.dart
+++ /dev/null
@@ -1,18 +0,0 @@
-// Copyright (c) 2023, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-inline class MyInt {
-  final int it;
-  MyInt(this.it);
-  void foo() { print('MyInt.foo'); }
-}
-
-final inline = 1;
-
-int get inline => 1;
-set inline(int value) {}
-
-void inline() {
-  var inline = 1;
-}