diff --git a/eval/chat_benchmarks/MTBench/pyproject.toml b/eval/chat_benchmarks/MTBench/pyproject.toml
index fedd9e2d..f0aeb7ab 100644
--- a/eval/chat_benchmarks/MTBench/pyproject.toml
+++ b/eval/chat_benchmarks/MTBench/pyproject.toml
@@ -23,7 +23,7 @@ model_worker = ["accelerate>=0.21", "peft", "sentencepiece", "torch", "transform
 webui = ["gradio>=4.10"]
 train = ["einops", "flash-attn>=2.0", "wandb"]
 llm_judge = ["openai<1", "anthropic>=0.3", "ray"]
-dev = ["black==23.3.0", "pylint==2.8.2"]
+dev = ["black==26.3.1", "pylint==2.8.2"]
 
 [project.urls]
 "Homepage" = "https://github.com/lm-sys/fastchat"