diff --git a/pyproject.toml b/pyproject.toml
index 9912539d4..931dbecde 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -47,7 +47,7 @@ dependencies = [
     "dvc-render>=1.0.1,<2",
     "dvc-studio-client>=0.21,<1",
     "dvc-task>=0.3.0,<1",
-    "flatten_dict<1,>=0.4.1",
+    "flatten-dict<1,>=0.4.1",
     "flufl.lock>=8.1.0,<10",
     "fsspec>=2024.2.0",
     "funcy>=1.14",