diff --git a/pyproject.toml b/pyproject.toml
index be1e36c7..71753071 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["flit_core >=3.9,<4"]
+requires = ["flit_core >=4.0.2,<5"]
 build-backend = "flit_core.buildapi"
 
 [project]
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 9024cdce..e904dce9 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,5 +1,5 @@
 # build dependencies
-flit==3.12.0
+flit==4.0.2
 # test dependencies
 pytest==9.1.1
 responses==0.26.2