diff --git a/backend/requirements.txt b/backend/requirements.txt
index 5cb7fc1..f278683 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -32,7 +32,7 @@ httpx>=0.27.0
 python-frontmatter>=1.1.0
 packaging>=23.0
 user-agents>=2.2.0
-cachetools>=7.1.1
+cachetools>=7.1.4
 cryptography>=47.0.0
 # --- Phase1+ infra ---
 aioboto3>=12.3.0