diff --git a/tools/pyproject.toml b/tools/pyproject.toml
index 055391d9..06051529 100644
--- a/tools/pyproject.toml
+++ b/tools/pyproject.toml
@@ -59,7 +59,7 @@ dev = [
     "packaging == 26.3",
     "pluggy == 1.6.0",
     "pycodestyle == 2.14.0",
-    "pyflakes == 3.4.0",
+    "pyflakes == 4.0.1",
     "pyparsing == 3.3.2",
     "pytest == 9.1.1",
     "pytest-cov == 7.1.0",