diff --git a/pyproject.toml b/pyproject.toml
index 48b742271..52947685c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -76,6 +76,7 @@ actions = [
 ]
 dev = [
     "flit >=3.2.0,<4.0.0",
+    "flit_core >=3.2.0,<4.0.0",
     "mypy >=2.0.0,<3.0.0",
     "types-pyyaml >=6.0.4,<7.0.0",
     "types-requests >=2.25.6,<3.0.0",