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What this PR does / why we need it?

Fix protobuf version in Dockerfile to resolve AttributeError: 'str' object has no attribute 'DESCRIPTOR' when packaging message to dict using protobuf. will remove version specification after ray-project/ray#54910 is merged

backport of #2028

Does this PR introduce any user-facing change?

N/A

How was this patch tested?

CI passed with new added test.

Fix protobuf version in Dockerfile to resolve `AttributeError: 'str'
object has no attribute 'DESCRIPTOR' when packaging message to dict`
using protobuf. will remove version specification after
ray-project/ray#54910 is merged

N/A

CI passed with existing test.

- vLLM version: v0.10.0
- vLLM main:
vllm-project/vllm@0e36abf

Signed-off-by: MengqingCao <cmq0113@163.com>
Signed-off-by: MengqingCao <cmq0113@163.com>
@MengqingCao MengqingCao changed the title [Build][Ray] Fix protobuf version in Dockerfile (#2028) [v0.9.1][Build][Ray] Fix protobuf version in Dockerfile (#2028) Aug 11, 2025
@github-actions github-actions bot added the documentation Improvements or additions to documentation label Aug 12, 2025
Signed-off-by: MengqingCao <cmq0113@163.com>
@wangxiyuan
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cherry-pick from main.

@wangxiyuan wangxiyuan merged commit cfed4b9 into vllm-project:v0.9.1-dev Aug 14, 2025
10 checks passed
@MengqingCao MengqingCao deleted the protobuf branch August 14, 2025 09:33
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2 participants