diff --git a/nipap/pyproject.toml b/nipap/pyproject.toml
index e40e5e7f1..a4b99be80 100644
--- a/nipap/pyproject.toml
+++ b/nipap/pyproject.toml
@@ -16,7 +16,7 @@ keywords = ["nipap"]
 dependencies = [
   "zipp==3.21.0",
   "importlib_metadata==8.5.0",
-  "Flask==3.0.3",
+  "Flask==3.1.3",
   "Flask-Compress==1.17",
   "flask-xml-rpc-re==0.1.4",
   "flask-restx==1.3.0",