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vLLM v0.19.1stable Released Apr 18, 2026
Impact Score: 5/10

vLLM v0.19.1 — Release Notes & Engineering Impact

Source available — automated, not human-reviewed

Component: vllm · Channel: stable. Automated analysis, not a compatibility certification. How this works.

Analysis updated: 2026-11-01.

Compatibility not verified — check source notes
$ python -m pip install 'vllm==0.19.1'
📄 .MD
✨ Features 1 🔧 Bug Fixes 6
⚡ Executive Summary (TL;DR)

vLLM v0.19.1. Source highlight: This is a patch release on top of `v0.19.0` with Transformers v5.5.3 upgrade and bug fixes for Gemma4:

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Who Does This Impact? (Role-Based Analysis)

💻 Software Engineers & Devs

Check the source notes against the package and APIs you use before upgrading.

📊 Product & Engineering Leads

Use the documented changes to assess relevance to your product; release frequency alone is not a quality measure.

⚙️ DevOps & Security

Verify the target version, runtime requirements and rollback procedure in the official documentation.

✨ New Features & Capabilities (1)

  • Add Gemma4 Eagle3 support (#39450)

🔧 Bug Fixes & Patches (6)

  • [Bugfix] Fix invalid JSON in Gemma 4 streaming tool calls by stripping partial delimiters (#38992)
  • [Bugfix][Frontend] Fix Gemma4 streaming HTML duplication after tool calls (#38909)
  • [Bugfix] Fix Gemma4 streaming tool call corruption for split boolean/number values (#39114)
  • [Tool] adjust_request to reasoning parser, and Gemma4 fixes (#39027)
  • [Gemma4][Bugfix]: Enable Gemma4ForCasualLM to load lora adapters correctly (#38844)
  • [Bugfix] Fix Gemma4 tool parser converting bare null to string "null" (#39679)
📄 View Raw Release Notes (Original Developer Log)
This is a patch release on top of `v0.19.0` with Transformers v5.5.3 upgrade and bug fixes for Gemma4: - Update to transformers v5 (#30566) - [Bugfix] Fix invalid JSON in Gemma 4 streaming tool calls by stripping partial delimiters (#38992) - [Bugfix][Frontend] Fix Gemma4 streaming HTML duplication after tool calls (#38909) - [Bugfix] Fix Gemma4 streaming tool call corruption for split boolean/number values (#39114) - [Tool] adjust_request to reasoning parser, and Gemma4 fixes (#39027) - [Gemma4] Support quantized MoE (#39045) - Add Gemma4 Eagle3 support (#39450) - [Gemma4][Bugfix]: Enable Gemma4ForCasualLM to load lora adapters correctly (#38844) - [Bugfix] Fix Gemma4 tool parser converting bare null to string "null" (#39679) - [Model] Fix Gemma 4 token repetition by dynamic BOS injection for PT models (#39842) - fix(kimi_k25): resolve media_placeholder_token_id from tokenizer (#39344)
← Older Version vLLM v0.19.0