diff --git a/pyproject.toml b/pyproject.toml
index fc0dbf9..7b6e75b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -22,7 +22,7 @@ Issues = "https://github.com/kodlyft/ksa/issues"
 Changelog = "https://github.com/kodlyft/ksa/releases"
 
 [build-system]
-requires = ["flit_core >=3.4,<4"]
+requires = ["flit_core >=3.4,<5"]
 build-backend = "flit_core.buildapi"
 
 # These dependencies are only installed when developer mode is enabled