diff --git a/pyproject.toml b/pyproject.toml
index 63d5e03..8624d81 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [build-system]
-requires = ["flit"]
-build-backend = "flit.buildapi"
+requires = ["flit_core >=2,<4"]
+build-backend = "flit_core.buildapi"
 
 [project]
 name = "norlabcontrollib"
@@ -42,4 +42,4 @@ line-length = 90
 disable = "C0330, C0326"
 
 [tool.pylint.format]
-max-line-length = "90"
\ No newline at end of file
+max-line-length = "90"