diff --git a/backend/pyproject.toml b/backend/pyproject.toml
index 6726f5db..c1ac3db9 100644
--- a/backend/pyproject.toml
+++ b/backend/pyproject.toml
@@ -36,7 +36,7 @@ dependencies = [
     "fastavro==1.12.1",
     "fonttools==4.61.1",
     "frozenlist==1.7.0",
-    "google-auth==2.45.0",
+    "google-auth==2.47.0",
     "googleapis-common-protos==1.70.0",
     "greenlet==3.3.0",
     "grpcio==1.76.0",
diff --git a/backend/uv.lock b/backend/uv.lock
index ed11e615..ffc3bf07 100644
--- a/backend/uv.lock
+++ b/backend/uv.lock
@@ -793,16 +793,15 @@ wheels = [
 
 [[package]]
 name = "google-auth"
-version = "2.45.0"
+version = "2.47.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "cachetools" },
     { name = "pyasn1-modules" },
     { name = "rsa" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/e5/00/3c794502a8b892c404b2dea5b3650eb21bfc7069612fbfd15c7f17c1cb0d/google_auth-2.45.0.tar.gz", hash = "sha256:90d3f41b6b72ea72dd9811e765699ee491ab24139f34ebf1ca2b9cc0c38708f3", size = 320708, upload-time = "2025-12-15T22:58:42.889Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/60/3c/ec64b9a275ca22fa1cd3b6e77fefcf837b0732c890aa32d2bd21313d9b33/google_auth-2.47.0.tar.gz", hash = "sha256:833229070a9dfee1a353ae9877dcd2dec069a8281a4e72e72f77d4a70ff945da", size = 323719, upload-time = "2026-01-06T21:55:31.045Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/c6/97/451d55e05487a5cd6279a01a7e34921858b16f7dc8aa38a2c684743cd2b3/google_auth-2.45.0-py2.py3-none-any.whl", hash = "sha256:82344e86dc00410ef5382d99be677c6043d72e502b625aa4f4afa0bdacca0f36", size = 233312, upload-time = "2025-12-15T22:58:40.777Z" },
+    { url = "https://files.pythonhosted.org/packages/db/18/79e9008530b79527e0d5f79e7eef08d3b179b7f851cfd3a2f27822fbdfa9/google_auth-2.47.0-py3-none-any.whl", hash = "sha256:c516d68336bfde7cf0da26aab674a36fedcf04b37ac4edd59c597178760c3498", size = 234867, upload-time = "2026-01-06T21:55:28.6Z" },
 ]
 
 [[package]]
@@ -1178,7 +1177,7 @@ requires-dist = [
     { name = "fastavro", specifier = "==1.12.1" },
     { name = "fonttools", specifier = "==4.61.1" },
     { name = "frozenlist", specifier = "==1.7.0" },
-    { name = "google-auth", specifier = "==2.45.0" },
+    { name = "google-auth", specifier = "==2.47.0" },
     { name = "googleapis-common-protos", specifier = "==1.70.0" },
     { name = "greenlet", specifier = "==3.3.0" },
     { name = "grpcio", specifier = "==1.76.0" },