diff --git a/backend/pyproject.toml b/backend/pyproject.toml
index c03e70fc..2f94f15c 100644
--- a/backend/pyproject.toml
+++ b/backend/pyproject.toml
@@ -6,7 +6,7 @@ readme = "README.md"
 requires-python = ">=3.13"
 license = "AGPL-3.0-only"
 dependencies = [
-    "fastapi>=0.138.0",
+    "fastapi>=0.139.0",
     "uvicorn[standard]>=0.49.0",
     "websockets>=16.0",
     "anthropic~=0.116.0",