diff --git a/candle-pyo3/pyproject.toml b/candle-pyo3/pyproject.toml
index e98f6ee5..f64f1857 100644
--- a/candle-pyo3/pyproject.toml
+++ b/candle-pyo3/pyproject.toml
@@ -31,5 +31,5 @@ line-length = 119
 target-version = ['py35']
 
 [project.optional-dependencies]
-testing = ["pytest", "black==22.3"]
+testing = ["pytest", "black==26.3.1"]
 huggingface = ["transformers>=4.33.3", "huggingface-hub>=0.17.3"]
\ No newline at end of file