diff --git a/samples/server/petstore/rust-server/.openapi-generator/VERSION b/samples/server/petstore/rust-server/.openapi-generator/VERSION
index 0f58aa041419..afa636560641 100644
--- a/samples/server/petstore/rust-server/.openapi-generator/VERSION
+++ b/samples/server/petstore/rust-server/.openapi-generator/VERSION
@@ -1 +1 @@
-3.1.2-SNAPSHOT
\ No newline at end of file
+4.0.0-SNAPSHOT
\ No newline at end of file