diff --git a/packages/dynamite/dynamite/lib/src/openapi_builder.dart b/packages/dynamite/dynamite/lib/src/openapi_builder.dart
index 5e42b4d77b9..427f9836fb2 100644
--- a/packages/dynamite/dynamite/lib/src/openapi_builder.dart
+++ b/packages/dynamite/dynamite/lib/src/openapi_builder.dart
@@ -22,6 +22,9 @@ class OpenAPIBuilder implements Builder {
     '.openapi.yaml': ['.openapi.dart'],
   };
 
+  /// The minimum openapi version supported by this builder.
+  static final minSupportedVersion = Version(3, 0, 0);
+
   @override
   Future<void> build(final BuildStep buildStep) async {
     try {
@@ -45,7 +48,8 @@ class OpenAPIBuilder implements Builder {
         _ => throw StateError('Openapi specs can only be yaml or json.'),
       };
 
-      if (Version.parse(spec.version).major != 3) {
+      final version = Version.parse(spec.version);
+      if (version < minSupportedVersion || version > minSupportedVersion.incrementMajor()) {
         throw Exception('Only OpenAPI 3.0.0 and later are supported');
       }