diff --git a/pyproject.toml b/pyproject.toml
index 38875a0..0c64e4d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -251,7 +251,7 @@ dev = [
     # could differ slightly from CI — CI's authority is the pinned pre-commit rev,
     # whose lint job runs on 3.11, so run `pre-commit run` before pushing if you
     # develop on 3.9. (ruff 0.16 needs only >=3.7, so it needs no split.)
-    "black~=26.5.1; python_version >= '3.10'",
+    "black>=26.5.1,<26.11.0; python_version >= '3.10'",
     "black~=25.11.0; python_version < '3.10'",
     "ruff~=0.16.0",
     "pre-commit>=3.7.0",