diff --git a/openapi-generator/lib/src/extensions/type_methods.dart b/openapi-generator/lib/src/extensions/type_methods.dart
index b1e8bca..ab751bc 100644
--- a/openapi-generator/lib/src/extensions/type_methods.dart
+++ b/openapi-generator/lib/src/extensions/type_methods.dart
@@ -9,7 +9,7 @@ import 'package:source_gen/source_gen.dart' show ConstantReader, TypeChecker;
 extension TypeMethods on ConstantReader {
   /// Returns `true` if `this` represents a constant expression
   /// with type `dynamic`.
-  bool get isDynamic => objectValue.type?.isDynamic ?? false;
+  bool get isDynamic => objectValue.type is DynamicType;
 
   /// Returns `true` is `this` represents a constant expression with
   /// type exactly `Iterable`.
diff --git a/openapi-generator/pubspec.yaml b/openapi-generator/pubspec.yaml
index 3f72286..9246ff9 100755
--- a/openapi-generator/pubspec.yaml
+++ b/openapi-generator/pubspec.yaml
@@ -11,7 +11,7 @@ dependencies:
   source_gen: '>=1.0.0 <=2.0.0'
   path: '>=1.0.0 <=2.0.0'
   openapi_generator_annotations: ^6.1.0
-  analyzer: '>=2.0.0 <7.0.0'
+  analyzer: '>5.12.0 <8.0.0'
   openapi_generator_cli: ^6.1.0
   crypto: '>=3.0.6 <=4.0.0'
   meta: '>=1.15.0 <=2.0.0'