diff --git a/backend/requirements.txt b/backend/requirements.txt
index 32cb404..f20f68c 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -35,4 +35,4 @@ pytest==8.3.4
 httpx==0.27.2          # required by FastAPI TestClient
 
 # Type checking
-mypy==1.13.0
+mypy==1.20.0