diff --git a/samples/client/petstore/dart-dio/pubspec.yaml b/samples/client/petstore/dart-dio/pubspec.yaml
index 92cbb8255c5a..1171a0028fbf 100644
--- a/samples/client/petstore/dart-dio/pubspec.yaml
+++ b/samples/client/petstore/dart-dio/pubspec.yaml
@@ -4,7 +4,7 @@ description: OpenAPI API client
 environment:
     sdk: ">=2.3.0 <3.0.0"
 dependencies:
-    dio: ^3.0.9
+    dio: ">=3.0.9 <6.0.0"
     built_value: ^7.1.0
     built_collection: ^4.3.2
 dev_dependencies: