diff --git a/requirements.txt b/requirements.txt
index 63f863d..0733911 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@ cachetools >= 5.3.0, < 6.0
 requests >= 2.25.1, < 3.0
 python-nomad == 2.0.0
 fastapi >= 0.104.1, < 1.0
-fastapi-utils >= 0.2.1, < 1.0
+fastapi-utils == 0.2.1  # lock until fixed: https://github.com/dmontagu/fastapi-utils/issues/305
 uvicorn[standard]>=0.20.0, < 1.0
 flaat >= 1.1.8, < 2.0
 typer >= 0.7.0, < 1.0