diff --git a/packages/functional_enum/example/pubspec.yaml b/packages/functional_enum/example/pubspec.yaml
index d4d3358..0c5f283 100644
--- a/packages/functional_enum/example/pubspec.yaml
+++ b/packages/functional_enum/example/pubspec.yaml
@@ -8,7 +8,7 @@ dependencies:
   functional_enum_annotation: ^1.2.1
 
 dev_dependencies:
-  build_runner: ^2.0.5
-  test: ^1.17.9
+  build_runner: ^2.1.2
+  test: ^1.17.12
   functional_enum:
     path: ../
diff --git a/packages/functional_enum/lib/builder.dart b/packages/functional_enum/lib/builder.dart
index 49c20e6..614a396 100644
--- a/packages/functional_enum/lib/builder.dart
+++ b/packages/functional_enum/lib/builder.dart
@@ -4,6 +4,12 @@ import 'package:build/build.dart';
 import 'package:functional_enum/src/functional_enum_generator.dart';
 import 'package:source_gen/source_gen.dart';
 
+/// Configuration for using `package:build`-compatible build systems.
+///
+/// See:
+/// * [build_runner](https://pub.dev/packages/build_runner)
+///
+/// This library is **not** intended to be imported by typical end-users.
 Builder functionalEnum(BuilderOptions options) {
-  return SharedPartBuilder([FunctionalEnumGenerator()], 'enum');
+  return SharedPartBuilder([const FunctionalEnumGenerator()], 'enum');
 }
diff --git a/packages/functional_enum/lib/src/functional_enum_generator.dart b/packages/functional_enum/lib/src/functional_enum_generator.dart
index 5978b59..14c3b3c 100644
--- a/packages/functional_enum/lib/src/functional_enum_generator.dart
+++ b/packages/functional_enum/lib/src/functional_enum_generator.dart
@@ -8,6 +8,8 @@ import 'package:source_gen/source_gen.dart';
 import 'enum_generator.dart';
 
 class FunctionalEnumGenerator extends GeneratorForAnnotation<FunctionalEnum> {
+  const FunctionalEnumGenerator();
+
   @override
   FutureOr<String> generateForAnnotatedElement(
       Element element, ConstantReader annotation, BuildStep buildStep) {
diff --git a/packages/functional_enum/pubspec.yaml b/packages/functional_enum/pubspec.yaml
index d0c56fd..8a00cff 100644
--- a/packages/functional_enum/pubspec.yaml
+++ b/packages/functional_enum/pubspec.yaml
@@ -7,8 +7,8 @@ environment:
   sdk: '>=2.12.0 <3.0.0'
 
 dependencies:
-  analyzer: ^1.7.0
-  build: ^2.0.2
+  analyzer: ^2.3.0
+  build: ^2.1.0
   build_config: ^1.0.0
   functional_enum_annotation: ^1.2.1
-  source_gen: ^1.0.2
+  source_gen: ^1.1.0
diff --git a/packages/functional_enum_annotation/pubspec.yaml b/packages/functional_enum_annotation/pubspec.yaml
index dd462b2..2dd4378 100644
--- a/packages/functional_enum_annotation/pubspec.yaml
+++ b/packages/functional_enum_annotation/pubspec.yaml
@@ -7,5 +7,5 @@ environment:
   sdk: '>=2.12.0 <3.0.0'
 
 dependencies:
-  meta: ^1.3.0
+  meta: ^1.7.0