diff --git a/pyproject.toml b/pyproject.toml
index 5941b74..fcbcba0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -39,7 +39,7 @@ Repository = "https://github.com/Bzero/typstwriter"
 typstwriter = "typstwriter.typstwriter:main"
 
 [build-system]
-requires = ["flit_core >=3.2,<4"]
+requires = ["flit_core >=3.2,<5"]
 build-backend = "flit_core.buildapi"
 
 [tool.ruff]