diff --git a/requirements-backend.txt b/requirements-backend.txt
index 5e1f1e1e..c2e792c4 100644
--- a/requirements-backend.txt
+++ b/requirements-backend.txt
@@ -11,7 +11,7 @@ Jinja2
 numexpr>=2.7.3
 hf_transfer
 evaluate
-vllm>=0.2.0
+vllm>=0.2.0,<0.2.6
 numpy<1.24
 ninja
 protobuf<3.21.0