diff --git a/.ci/docker/requirements.txt b/.ci/docker/requirements.txt
index a1b0d6b5b3..0c344b75bc 100644
--- a/.ci/docker/requirements.txt
+++ b/.ci/docker/requirements.txt
@@ -37,9 +37,9 @@ setuptools<81
 awscliv2==2.1.1
 flask
 spacy==3.7.1  # Keep this version consistent with the model version in .jenkins/build.sh
-# Pin protobuf: ray[serve]==2.55.0 uses FieldDescriptor.label, removed in protobuf>=6.
+# Pin protobuf: ray[serve]==2.56.0 uses FieldDescriptor.label, removed in protobuf>=6.
 protobuf<6
-ray[serve,train,tune]==2.55.0
+ray[serve,train,tune]==2.56.0
 tiktoken
 tensorboard
 jinja2==3.1.6