diff --git a/pyproject.toml b/pyproject.toml
index e5ad4be316..ffe99961d2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["flit_core >=3.2,<4"]
+requires = ["flit_core >=3.2,<5"]
 build-backend = "flit_core.buildapi"
 
 [project]
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 63568a93ab..4d25d9b451 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -17,8 +17,8 @@ cryptography==48.0.1
 Deprecated==1.3.1
 dill==0.4.1
 docutils==0.23
-flit==3.12.0
-flit_core==3.12.0
+flit==4.1.0
+flit_core==4.1.0
 frozenlist==1.8.0
 h11==0.16.0
 h2==4.3.0