diff --git a/pyproject.toml b/pyproject.toml
index ca21367b..1749ecfc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -32,7 +32,7 @@ license = "MIT"
 
 [project.optional-dependencies]
 dev = [
-    "bandit >= 1.8.6, < 1.9.0",  # latest version for Python 3.9 is 1.8.x
+    "bandit >= 1.8.6, < 1.10.0",  # latest version for Python 3.9 is 1.8.x
     "black >= 25.11.0",
     "flake8 >= 7.0.0",
     "flake8-import-order >= 0.19.2",