diff --git a/backend/pyproject.toml b/backend/pyproject.toml
index 08b6a8c..6794a80 100644
--- a/backend/pyproject.toml
+++ b/backend/pyproject.toml
@@ -6,7 +6,7 @@ requires-python = ">=3.11,<3.12"
 dependencies = [
     "fastapi>=0.115.0",
     "uvicorn[standard]>=0.32.0",
-    "python-multipart>=0.0.18",
+    "python-multipart>=0.0.27",
     "openai>=1.109.1",
     "pydantic>=2.7.4",
     "slowapi==0.1.9",
diff --git a/backend/uv.lock b/backend/uv.lock
index 16ba806..02c7322 100644
--- a/backend/uv.lock
+++ b/backend/uv.lock
@@ -1,5 +1,5 @@
 version = 1
-revision = 2
+revision = 3
 requires-python = "==3.11.*"
 resolution-markers = [
     "sys_platform == 'win32'",
@@ -396,7 +396,6 @@ wheels = [
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     { url = "https://files.pythonhosted.org/packages/70/79/0de5e62b873e08fe3cef7dbe84e5c4bc0e8ed0c7ff131bccb8405cd107c8/greenlet-3.3.2-cp311-cp311-musllinux_1_2_aarch64.whl", hash = "sha256:442b6057453c8cb29b4fb36a2ac689382fc71112273726e2423f7f17dc73bf99", size = 1554649, upload-time = "2026-02-20T20:49:32.293Z" },
     { url = "https://files.pythonhosted.org/packages/5a/00/32d30dee8389dc36d42170a9c66217757289e2afb0de59a3565260f38373/greenlet-3.3.2-cp311-cp311-musllinux_1_2_x86_64.whl", hash = "sha256:45abe8eb6339518180d5a7fa47fa01945414d7cca5ecb745346fc6a87d2750be", size = 1619472, upload-time = "2026-02-20T20:21:07.966Z" },
@@ -707,7 +706,7 @@ requires-dist = [
     { name = "orjson", specifier = ">=3.11" },
     { name = "pydantic", specifier = ">=2.7.4" },
     { name = "pypdf", specifier = ">=5" },
-    { name = "python-multipart", specifier = ">=0.0.18" },
+    { name = "python-multipart", specifier = ">=0.0.27" },
     { name = "ruff", specifier = "==0.8.0" },
     { name = "slowapi", specifier = "==0.1.9" },
     { name = "tiktoken", specifier = ">=0.5.1" },
@@ -1071,11 +1070,11 @@ wheels = [
 
 [[package]]
 name = "python-multipart"
-version = "0.0.22"
+version = "0.0.27"
 source = { registry = "https://pypi.org/simple" }
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+sdist = { url = "https://files.pythonhosted.org/packages/69/9b/f23807317a113dc36e74e75eb265a02dd1a4d9082abc3c1064acd22997c4/python_multipart-0.0.27.tar.gz", hash = "sha256:9870a6a8c5a20a5bf4f07c017bd1489006ff8836cff097b6933355ee2b49b602", size = 44043, upload-time = "2026-04-27T10:51:26.649Z" }
 wheels = [
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 ]
 
 [[package]]