diff --git a/pyproject.toml b/pyproject.toml
index 57f7286f2221..09f3486efd28 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [build-system]
 requires = [
-"flit_core>=3.7.1,<3.9.1",
+"flit_core>=3.7.1,<3.12.1",
 ]
 build-backend = "pep517"
 backend-path = ["backends"]
diff --git a/requirements-base-lock.txt b/requirements-base-lock.txt
index a79335ce9d78..986b7cb3e597 100644
--- a/requirements-base-lock.txt
+++ b/requirements-base-lock.txt
@@ -6,9 +6,9 @@
 #
 
 # The following packages are considered to be unsafe in a requirements file:
-flit-core==3.9.0 \
-    --hash=sha256:72ad266176c4a3fcfab5f2930d76896059851240570ce9a98733b658cb786eba \
-    --hash=sha256:7aada352fb0c7f5538c4fafeddf314d3a6a92ee8e2b1de70482329e42de70301
+flit-core==3.12.0 \
+    --hash=sha256:18f63100d6f94385c6ed57a72073443e1a71a4acb4339491615d0f16d6ff01b2 \
+    --hash=sha256:e7a0304069ea895172e3c7bb703292e992c5d1555dd1233ab7b5621b5b69e62c
     # via -r requirements-base.txt
 wheel==0.43.0 \
     --hash=sha256:465ef92c69fa5c5da2d1cf8ac40559a8c940886afcef87dcf14b9470862f1d85 \
diff --git a/requirements-base.txt b/requirements-base.txt
index 19cc4e1b300b..9ce32a79fa53 100644
--- a/requirements-base.txt
+++ b/requirements-base.txt
@@ -1,2 +1,2 @@
 wheel==0.43.0
-flit_core==3.9.0
+flit_core==3.12.0
diff --git a/requirements-dev-lock.txt b/requirements-dev-lock.txt
index d27ac5072ddd..7746ee05f993 100644
--- a/requirements-dev-lock.txt
+++ b/requirements-dev-lock.txt
@@ -302,9 +302,9 @@ zipp==3.23.0 \
     # via importlib-metadata
 
 # The following packages are considered to be unsafe in a requirements file:
-flit-core==3.9.0 \
-    --hash=sha256:72ad266176c4a3fcfab5f2930d76896059851240570ce9a98733b658cb786eba \
-    --hash=sha256:7aada352fb0c7f5538c4fafeddf314d3a6a92ee8e2b1de70482329e42de70301
+flit-core==3.12.0 \
+    --hash=sha256:18f63100d6f94385c6ed57a72073443e1a71a4acb4339491615d0f16d6ff01b2 \
+    --hash=sha256:e7a0304069ea895172e3c7bb703292e992c5d1555dd1233ab7b5621b5b69e62c
     # via -r requirements-base.txt
 pip==25.2 \
     --hash=sha256:578283f006390f85bb6282dffb876454593d637f5d1be494b5202ce4877e71f2 \
diff --git a/requirements/bootstrap.txt b/requirements/bootstrap.txt
index 5649a3a4eb25..334bd29b30cc 100644
--- a/requirements/bootstrap.txt
+++ b/requirements/bootstrap.txt
@@ -1,2 +1,2 @@
 pip>=22.0.0,<26.0.0
-flit_core>=3.7.1,<3.9.1
+flit_core>=3.7.1,<3.12.1