diff --git a/poetry.lock b/poetry.lock
index cb90355e..997243be 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -406,7 +406,7 @@ testing = ["big-O", "flake8 (<5)", "jaraco.functools", "jaraco.itertools", "more
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.7"
-content-hash = "722a9dc6716b6c5ea6c24f4992ad4dcf3240224de361d77fe85ea563f59f6a49"
+content-hash = "3b456ba0475839523ae9bf7f7f902e6a0c7313b7fcaf8bd2da27af1f63f4fa20"
 
 [metadata.files]
 black = [
diff --git a/pyproject.toml b/pyproject.toml
index 8751206e..ab99e059 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,7 +25,7 @@ pycodestyle = [
     {version = "^2.9", python = ">=3.7,<3.12"},
     {version = "^2.11", python = "^3.12"},
 ]
-black = ">=23.1"
+black = ">=23.1,<26.0" # 26.0 introduces formatting changes, but drops support for Python < 3.10, so pin to version that has consistent formatting across 3.9-3.14
 
 # Additional support libraries
 # These dependencies were selected because they are already used by black.