diff --git a/pyproject.toml b/pyproject.toml
index df9aa86..388a80c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,7 @@ requires-python = ">=3.14"
 dependencies = [
     "cryptography==46.0.5",
     "ecdsa==0.19.1",
-    "flask==3.1.2",
+    "flask==3.1.3",
     "flask-compress==1.23",
     "numpy==2.4.1",
     "pytest-playwright==0.7.1",
diff --git a/uv.lock b/uv.lock
index e0506dd..09e8af1 100644
--- a/uv.lock
+++ b/uv.lock
@@ -200,7 +200,7 @@ wheels = [
 
 [[package]]
 name = "flask"
-version = "3.1.2"
+version = "3.1.3"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "blinker" },
@@ -210,9 +210,9 @@ dependencies = [
     { name = "markupsafe" },
     { name = "werkzeug" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/dc/6d/cfe3c0fcc5e477df242b98bfe186a4c34357b4847e87ecaef04507332dab/flask-3.1.2.tar.gz", hash = "sha256:bf656c15c80190ed628ad08cdfd3aaa35beb087855e2f494910aa3774cc4fd87", size = 720160, upload-time = "2025-08-19T21:03:21.205Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/26/00/35d85dcce6c57fdc871f3867d465d780f302a175ea360f62533f12b27e2b/flask-3.1.3.tar.gz", hash = "sha256:0ef0e52b8a9cd932855379197dd8f94047b359ca0a78695144304cb45f87c9eb", size = 759004, upload-time = "2026-02-19T05:00:57.678Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/ec/f9/7f9263c5695f4bd0023734af91bedb2ff8209e8de6ead162f35d8dc762fd/flask-3.1.2-py3-none-any.whl", hash = "sha256:ca1d8112ec8a6158cc29ea4858963350011b5c846a414cdb7a954aa9e967d03c", size = 103308, upload-time = "2025-08-19T21:03:19.499Z" },
+    { url = "https://files.pythonhosted.org/packages/7f/9c/34f6962f9b9e9c71f6e5ed806e0d0ff03c9d1b0b2340088a0cf4bce09b18/flask-3.1.3-py3-none-any.whl", hash = "sha256:f4bcbefc124291925f1a26446da31a5178f9483862233b23c0c96a20701f670c", size = 103424, upload-time = "2026-02-19T05:00:56.027Z" },
 ]
 
 [[package]]
@@ -544,7 +544,7 @@ dependencies = [
 requires-dist = [
     { name = "cryptography", specifier = "==46.0.5" },
     { name = "ecdsa", specifier = "==0.19.1" },
-    { name = "flask", specifier = "==3.1.2" },
+    { name = "flask", specifier = "==3.1.3" },
     { name = "flask-compress", specifier = "==1.23" },
     { name = "numpy", specifier = "==2.4.1" },
     { name = "pytest-playwright", specifier = "==0.7.1" },