diff --git a/CHANGELOG.md b/CHANGELOG.md
index 384a34d5..efe41afd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+# 8.12.3
+
+- Require `analyzer ^10.0.0`, stop using removed and deprecated methods from
+  earlier versions.
+
 # 8.12.2
 
 - Allow `analyzer 10.0.0`.
diff --git a/benchmark/pubspec.yaml b/benchmark/pubspec.yaml
index bfbc6104..013524e8 100644
--- a/benchmark/pubspec.yaml
+++ b/benchmark/pubspec.yaml
@@ -1,5 +1,5 @@
 name: benchmark
-version: 8.12.2
+version: 8.12.3
 publish_to: none
 description: >
   Benchmark, not for publishing.
@@ -14,7 +14,7 @@ dependencies:
 
 dev_dependencies:
   build_runner: '>=1.0.0 <3.0.0'
-  built_value_generator: ^8.12.2
+  built_value_generator: ^8.12.3
   pedantic: ^1.4.0
   quiver: '>=0.21.0 <4.0.0'
   test: ^1.0.0
diff --git a/built_value/pubspec.yaml b/built_value/pubspec.yaml
index 7b78b6e0..689539dc 100644
--- a/built_value/pubspec.yaml
+++ b/built_value/pubspec.yaml
@@ -1,5 +1,5 @@
 name: built_value
-version: 8.12.2
+version: 8.12.3
 description: >
   Value types with builders, Dart classes as enums, and serialization.
   This library is the runtime dependency.
diff --git a/built_value_generator/lib/src/enum_source_field.dart b/built_value_generator/lib/src/enum_source_field.dart
index fa273213..2065637d 100644
--- a/built_value_generator/lib/src/enum_source_field.dart
+++ b/built_value_generator/lib/src/enum_source_field.dart
@@ -73,9 +73,7 @@ abstract class EnumSourceField
     var enumName = classElement.displayName;
     for (var fieldElement in classElement.fields) {
       final type = DartTypes.tryGetName(fieldElement.getter?.returnType);
-      // TODO(davidmorgan): update when support for analyzer 9 is removed.
-      // ignore: deprecated_member_use
-      if (!fieldElement.isSynthetic &&
+      if (fieldElement.isOriginDeclaration &&
           (type == enumName || type == 'dynamic')) {
         result.add(EnumSourceField(parsedLibrary, fieldElement));
       }
diff --git a/built_value_generator/lib/src/value_source_class.dart b/built_value_generator/lib/src/value_source_class.dart
index 7a2cfe37..6fa1fa4c 100644
--- a/built_value_generator/lib/src/value_source_class.dart
+++ b/built_value_generator/lib/src/value_source_class.dart
@@ -111,9 +111,7 @@ abstract class ValueSourceClass
 
       // Base class must have no fields.
       if (supertype.element.fields.any(
-        // TODO(davidmorgan): update when support for analyzer 9 is removed.
-        // ignore: deprecated_member_use
-        (field) => !field.isStatic && !field.isSynthetic,
+        (field) => !field.isStatic && field.isOriginDeclaration,
       )) {
         return false;
       }
@@ -293,9 +291,7 @@ abstract class ValueSourceClass
         element.constructors
             .where(
               (constructor) =>
-                  // TODO(davidmorgan): update when support for analyzer 9 is removed.
-                  // ignore: deprecated_member_use
-                  !constructor.isFactory && !constructor.isSynthetic,
+                  !constructor.isFactory && constructor.isOriginDeclaration,
             )
             .map(
               (constructor) => parsedLibrary
@@ -322,9 +318,7 @@ abstract class ValueSourceClass
         builderElement!.constructors
             .where(
               (constructor) =>
-                  // TODO(davidmorgan): update when support for analyzer 9 is removed.
-                  // ignore: deprecated_member_use
-                  !constructor.isFactory && !constructor.isSynthetic,
+                  !constructor.isFactory && constructor.isOriginDeclaration,
             )
             .map(
               (constructor) => parsedLibrary
@@ -552,9 +546,7 @@ abstract class ValueSourceClass
           GeneratorError(
             (b) => b
               ..message = 'Make class implement $expectedInterface.'
-              // TODO(davidmorgan): update when support for analyzer 8 is removed.
-              // ignore: deprecated_member_use
-              ..offset = classDeclaration.leftBracket.offset - 1
+              ..offset = classDeclaration.body.offset - 1
               ..length = 0
               ..fix = 'implements $expectedInterface',
           ),
@@ -683,9 +675,7 @@ abstract class ValueSourceClass
             (b) => b
               ..message =
                   'Make class have exactly one constructor: $expectedConstructor;'
-              // TODO(davidmorgan): update when support for analyzer 8 is removed.
-              // ignore: deprecated_member_use
-              ..offset = classDeclaration.rightBracket.offset
+              ..offset = classDeclaration.body.endToken.offset
               ..length = 0
               ..fix = '  $expectedConstructor;\n',
           ),
@@ -713,9 +703,7 @@ abstract class ValueSourceClass
               (b) => b
                 ..message =
                     'Make class have exactly one constructor: $expectedConstructor;'
-                // TODO(davidmorgan): update when support for analyzer 8 is removed.
-                // ignore: deprecated_member_use
-                ..offset = classDeclaration.rightBracket.offset
+                ..offset = classDeclaration.body.endToken.offset
                 ..length = 0
                 ..fix = '  $expectedConstructor;\n',
             ),
@@ -760,9 +748,7 @@ abstract class ValueSourceClass
               ..message =
                   'Add a factory so your class can be instantiated. Example:\n\n'
                       '$exampleFactory'
-              // TODO(davidmorgan): update when support for analyzer 8 is removed.
-              // ignore: deprecated_member_use
-              ..offset = classDeclaration.rightBracket.offset
+              ..offset = classDeclaration.body.endToken.offset
               ..length = 0
               ..fix = '  $exampleFactory\n',
           ),
diff --git a/built_value_generator/lib/src/value_source_field.dart b/built_value_generator/lib/src/value_source_field.dart
index 2197c1aa..3d3ed728 100644
--- a/built_value_generator/lib/src/value_source_field.dart
+++ b/built_value_generator/lib/src/value_source_field.dart
@@ -99,9 +99,8 @@ abstract class ValueSourceField
   }
 
   @memoized
-  // TODO(davidmorgan): update when support for analyzer 9 is removed.
-  // ignore: deprecated_member_use
-  bool get isGetter => element.getter != null && !element.getter!.isSynthetic;
+  bool get isGetter =>
+      element.getter != null && element.getter!.isOriginDeclaration;
 
   @memoized
   bool get hasNullableAnnotation => element.getter!.metadata.annotations.any(
@@ -148,9 +147,7 @@ abstract class ValueSourceField
       builderFieldExists &&
       builderElement!.getter != null &&
       !builderElement!.getter!.isAbstract &&
-      // TODO(davidmorgan): update when support for analyzer 9 is removed.
-      // ignore: deprecated_member_use
-      builderElement!.getter!.isSynthetic;
+      !builderElement!.getter!.isOriginDeclaration;
 
   @memoized
   bool get builderFieldIsGetterSetterPair =>
@@ -292,9 +289,7 @@ abstract class ValueSourceField
     for (var field in collectFields(classElement)) {
       if (!field.isStatic &&
           field.getter != null &&
-          // TODO(davidmorgan): update when support for analyzer 9 is removed.
-          // ignore: deprecated_member_use
-          (field.getter!.isAbstract || field.getter!.isSynthetic)) {
+          (field.getter!.isAbstract || !field.getter!.isOriginDeclaration)) {
         final builderField = builderClassElement?.getField(field.name!);
         result.add(
           ValueSourceField(
diff --git a/built_value_generator/pubspec.yaml b/built_value_generator/pubspec.yaml
index 9acdbd40..ddcfb874 100644
--- a/built_value_generator/pubspec.yaml
+++ b/built_value_generator/pubspec.yaml
@@ -1,5 +1,5 @@
 name: built_value_generator
-version: 8.12.2
+version: 8.12.3
 description: >
   Value types with builders, Dart classes as enums, and serialization.
   This library is the dev dependency.
@@ -13,7 +13,7 @@ environment:
   sdk: '>=3.6.0 <4.0.0'
 
 dependencies:
-  analyzer: '>=8.1.1 <11.0.0'
+  analyzer: ^10.0.0
   build: '>=3.0.0 <5.0.0'
   build_config: ^1.2.0
   built_collection: ^5.0.0
diff --git a/built_value_test/pubspec.yaml b/built_value_test/pubspec.yaml
index 0603de35..535317a0 100644
--- a/built_value_test/pubspec.yaml
+++ b/built_value_test/pubspec.yaml
@@ -1,5 +1,5 @@
 name: built_value_test
-version: 8.12.2
+version: 8.12.3
 description: >
   Value types with builders, Dart classes as enums, and serialization.
   This library provides test support.
@@ -21,7 +21,7 @@ dependencies:
   quiver: '>=0.21.0 <4.0.0'
 
 dev_dependencies:
-  built_value_generator: ^8.12.2
+  built_value_generator: ^8.12.3
   build_runner: '>=1.0.0 <3.0.0'
   pedantic: ^1.4.0
   test: ^1.0.0
diff --git a/chat_example/pubspec.yaml b/chat_example/pubspec.yaml
index 12811bbd..9ff06f88 100644
--- a/chat_example/pubspec.yaml
+++ b/chat_example/pubspec.yaml
@@ -1,5 +1,5 @@
 name: chat_example
-version: 8.12.2
+version: 8.12.3
 publish_to: none
 description: >
   Just an example, not for publishing.
@@ -21,6 +21,6 @@ dev_dependencies:
   build_runner: any
   build_test: any
   build_web_compilers: any
-  built_value_generator: ^8.12.2
+  built_value_generator: ^8.12.3
   pedantic: ^1.4.0
   test: ^1.0.0
diff --git a/end_to_end_test/pubspec.yaml b/end_to_end_test/pubspec.yaml
index f915f9cf..70d37617 100644
--- a/end_to_end_test/pubspec.yaml
+++ b/end_to_end_test/pubspec.yaml
@@ -1,5 +1,5 @@
 name: end_to_end_test
-version: 8.12.2
+version: 8.12.3
 publish_to: none
 description: >
   Tests, not for publishing.
@@ -15,7 +15,7 @@ dependencies:
 dev_dependencies:
   build: '>=3.1.0 <5.0.0'
   build_runner: '>=2.5.0 <3.0.0'
-  built_value_generator: ^8.12.2
+  built_value_generator: ^8.12.3
   fixnum: ^1.0.0
   pedantic: ^1.4.0
   quiver: '>=0.21.0 <4.0.0'
diff --git a/example/pubspec.yaml b/example/pubspec.yaml
index 48c96a03..b1862ba1 100644
--- a/example/pubspec.yaml
+++ b/example/pubspec.yaml
@@ -13,7 +13,7 @@ dependencies:
 
 dev_dependencies:
   build_runner: '>=1.0.0 <3.0.0'
-  built_value_generator: ^8.12.2
+  built_value_generator: ^8.12.3
   pedantic: ^1.4.0
   quiver: '>=0.21.0 <4.0.0'
   test: ^1.0.0