diff --git a/pyproject.toml b/pyproject.toml
index 23b547a..f02c582 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,7 +33,7 @@ dependencies = [
     "sqlalchemy[asyncio]>=2.0",
     "asyncpg>=0.31.0",
     "langgraph-checkpoint-postgres>=2.0",
-    "alembic>=1.13",
+    "alembic>=1.18.5",
     # LLM — multi-vendor LiteLLM (PRD §13 #10)
     "litellm>=1.50",
     "langsmith>=0.8.4",