diff --git a/modules/openapi-generator/src/main/resources/dart/libraries/dio/pubspec.mustache b/modules/openapi-generator/src/main/resources/dart/libraries/dio/pubspec.mustache
index 5a93026402d2..8da948f0105a 100644
--- a/modules/openapi-generator/src/main/resources/dart/libraries/dio/pubspec.mustache
+++ b/modules/openapi-generator/src/main/resources/dart/libraries/dio/pubspec.mustache
@@ -10,7 +10,7 @@ publish_to: {{.}}
 {{/pubPublishTo}}
 
 environment:
-  sdk: '>={{#useJsonSerializable}}2.17.0{{/useJsonSerializable}}{{^useJsonSerializable}}2.15.0{{/useJsonSerializable}} <4.0.0'
+  sdk: '>={{#useJsonSerializable}}3.0.0{{/useJsonSerializable}}{{^useJsonSerializable}}2.15.0{{/useJsonSerializable}} <4.0.0'
 
 dependencies:
   dio: '^5.2.0'
diff --git a/samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake-json_serializable/pubspec.yaml b/samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake-json_serializable/pubspec.yaml
index 8a32778ad38a..1aeab9f97246 100644
--- a/samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake-json_serializable/pubspec.yaml
+++ b/samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake-json_serializable/pubspec.yaml
@@ -4,7 +4,7 @@ description: OpenAPI API client
 homepage: homepage
 
 environment:
-  sdk: '>=2.17.0 <4.0.0'
+  sdk: '>=3.0.0 <4.0.0'
 
 dependencies:
   dio: '^5.2.0'