diff --git a/setup.py b/setup.py
index 452da9c32d9..98dd9978564 100644
--- a/setup.py
+++ b/setup.py
@@ -35,7 +35,7 @@
     "pyarrow>=19.0.0",
     "pybind11",
     "pylatexenc",
-    "ray[default]>=2.41.0",
+    "ray[default]==2.55.1",
     "torchdata",
     "tensordict>=0.8.0,<=0.10.0,!=0.9.0",
     "transformers",