diff --git a/modules/openapi-generator/src/main/resources/dart2/pubspec.mustache b/modules/openapi-generator/src/main/resources/dart2/pubspec.mustache
index 133bd7fb792e..186986237424 100644
--- a/modules/openapi-generator/src/main/resources/dart2/pubspec.mustache
+++ b/modules/openapi-generator/src/main/resources/dart2/pubspec.mustache
@@ -7,7 +7,7 @@ version: '{{{pubVersion}}}'
 description: '{{{pubDescription}}}'
 homepage: '{{{pubHomepage}}}'
 environment:
-  sdk: '>=2.14.0 <3.0.0'
+  sdk: '>=2.12.0 <3.0.0'
 dependencies:
   http: '>=0.13.0 <0.14.0'
   intl: '^0.17.0'
diff --git a/samples/openapi3/client/petstore/dart2/petstore_client_lib/pubspec.yaml b/samples/openapi3/client/petstore/dart2/petstore_client_lib/pubspec.yaml
index ee196b267a79..00043ba660cd 100644
--- a/samples/openapi3/client/petstore/dart2/petstore_client_lib/pubspec.yaml
+++ b/samples/openapi3/client/petstore/dart2/petstore_client_lib/pubspec.yaml
@@ -7,7 +7,7 @@ version: '1.0.0'
 description: 'OpenAPI API client'
 homepage: 'homepage'
 environment:
-  sdk: '>=2.14.0 <3.0.0'
+  sdk: '>=2.12.0 <3.0.0'
 dependencies:
   http: '>=0.13.0 <0.14.0'
   intl: '^0.17.0'
diff --git a/samples/openapi3/client/petstore/dart2/petstore_client_lib_fake/pubspec.yaml b/samples/openapi3/client/petstore/dart2/petstore_client_lib_fake/pubspec.yaml
index ee196b267a79..00043ba660cd 100644
--- a/samples/openapi3/client/petstore/dart2/petstore_client_lib_fake/pubspec.yaml
+++ b/samples/openapi3/client/petstore/dart2/petstore_client_lib_fake/pubspec.yaml
@@ -7,7 +7,7 @@ version: '1.0.0'
 description: 'OpenAPI API client'
 homepage: 'homepage'
 environment:
-  sdk: '>=2.14.0 <3.0.0'
+  sdk: '>=2.12.0 <3.0.0'
 dependencies:
   http: '>=0.13.0 <0.14.0'
   intl: '^0.17.0'