diff --git a/samples/client/petstore/csharp-netcore/OpenAPIClient-httpclient/.openapi-generator/VERSION b/samples/client/petstore/csharp-netcore/OpenAPIClient-httpclient/.openapi-generator/VERSION
index c30f0ec2be7f..5f68295fc196 100644
--- a/samples/client/petstore/csharp-netcore/OpenAPIClient-httpclient/.openapi-generator/VERSION
+++ b/samples/client/petstore/csharp-netcore/OpenAPIClient-httpclient/.openapi-generator/VERSION
@@ -1 +1 @@
-5.1.0-SNAPSHOT
\ No newline at end of file
+6.0.0-SNAPSHOT
\ No newline at end of file
diff --git a/samples/openapi3/client/petstore/dart2/petstore_json_serializable_client_lib_fake/.openapi-generator/VERSION b/samples/openapi3/client/petstore/dart2/petstore_json_serializable_client_lib_fake/.openapi-generator/VERSION
index c30f0ec2be7f..5f68295fc196 100644
--- a/samples/openapi3/client/petstore/dart2/petstore_json_serializable_client_lib_fake/.openapi-generator/VERSION
+++ b/samples/openapi3/client/petstore/dart2/petstore_json_serializable_client_lib_fake/.openapi-generator/VERSION
@@ -1 +1 @@
-5.1.0-SNAPSHOT
\ No newline at end of file
+6.0.0-SNAPSHOT
\ No newline at end of file
diff --git a/samples/server/petstore/aspnetcore-5.0/.openapi-generator/VERSION b/samples/server/petstore/aspnetcore-5.0/.openapi-generator/VERSION
index c30f0ec2be7f..5f68295fc196 100644
--- a/samples/server/petstore/aspnetcore-5.0/.openapi-generator/VERSION
+++ b/samples/server/petstore/aspnetcore-5.0/.openapi-generator/VERSION
@@ -1 +1 @@
-5.1.0-SNAPSHOT
\ No newline at end of file
+6.0.0-SNAPSHOT
\ No newline at end of file