diff --git a/pyproject.toml b/pyproject.toml
index e1faaec..9f5c103 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -51,7 +51,7 @@ Changelog = "https://github.com/allenai/olmocr/blob/main/CHANGELOG.md"
 
 [project.optional-dependencies]
 gpu = [
-    "vllm==0.6.6"
+    "vllm==0.6.4"
 ]
 
 dev = [