diff --git a/pyproject.toml b/pyproject.toml
index 01b8605..224d8d6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ dev = [
     "coverage[toml]==7.4.1",
     "flake8==7.0.0",
     "flake8-bugbear==24.2.6",
-    "flit==3.8.0",
+    "flit==3.9.0",
     "mypy==1.8.0",
     "ufmt==2.3.0",
     "usort==1.0.7",