diff --git a/src/backend/pyproject.toml b/src/backend/pyproject.toml
index 54cc20c1..8f353dcf 100644
--- a/src/backend/pyproject.toml
+++ b/src/backend/pyproject.toml
@@ -56,7 +56,7 @@ dependencies = [
     "nested-multipart-parser==1.6.0",
     "posthog==7.0.0",
     "pydantic==2.12.4",
-    "pydantic-ai-slim[openai,mistral,mcp,evals,logfire]==1.77.0",
+    "pydantic-ai-slim[openai,mistral,mcp,evals,logfire]==1.99.0",
     "psycopg[binary]==3.2.12",
     "PyJWT==2.12.0",
     "python-magic==0.4.27",