diff --git a/pyproject.toml b/pyproject.toml
index 682eda224..78711203d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,7 +13,7 @@ license = {text = "Apache 2"}
 dependencies = [
     "fms-model-optimizer>=0.2.0",
     "ibm-fms==1.0.0",
-    "vllm>=0.9.0",
+    "vllm>=0.9.0,!=0.9.1",
 ]
 requires-python = ">=3.9"
 dynamic = ["version"]
diff --git a/uv.lock b/uv.lock
index 1e192a68c..7d617a3cc 100644
--- a/uv.lock
+++ b/uv.lock
@@ -4816,7 +4816,7 @@ lint = [
 requires-dist = [
     { name = "fms-model-optimizer", specifier = ">=0.2.0" },
     { name = "ibm-fms", specifier = "==1.0.0" },
-    { name = "vllm", specifier = ">=0.9.0" },
+    { name = "vllm", specifier = ">=0.9.0,!=0.9.1" },
 ]
 
 [package.metadata.requires-dev]