diff --git a/backend/pyproject.toml b/backend/pyproject.toml
index 370d75d..bb923b5 100644
--- a/backend/pyproject.toml
+++ b/backend/pyproject.toml
@@ -29,7 +29,7 @@ dependencies = [
     "pydantic-settings==2.7.1",
     "sqlalchemy==2.0.36",
     "aiosqlite==0.20.0",
-    "openai==1.58.1",
+    "openai==3.6.0",
     "httpx==0.28.1",
     "passlib[bcrypt]==1.7.4",
     # Mirror requirements.txt: PyJWT is imported by app/core/auth.py; bcrypt 4.1+
diff --git a/backend/requirements.txt b/backend/requirements.txt
index 9d21d24..29de52b 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -12,7 +12,7 @@ sqlalchemy==2.0.36
 aiosqlite==0.20.0
 
 # LLM / AI
-openai==1.58.1
+openai==3.6.0
 
 # HTTP Client
 httpx==0.28.1